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WIGGLING 'LITE' IN GUEST MODE

Serge Maintenance Info
MUFF WIGGLER Forum Index -> Buchla, EMS & Serge  
Author Serge Maintenance Info
BananaPlug
Does anybody have a compendium of tune up info we could archive in a safe place? Things like 1V/O trimmers and VCA control bleed through trimmers. Anything like that.
pickleinn
From my web notes from various sources


Banana Jack Color Code
Black = AC-coupled (IN or OUT)
Blue = DC-coupled (IN or OUT)
Yellow = Trigger (IN)
Red = Gate (IN or OUT)
Grey = White Noise (OUT)
Purple = Pink Noise (OUT) or Sync (IN)

PSD vs Obelisk
the psd (power supply distribution) is for shop panels while the Obelisk is for m-odules. The obelisk contains a PSD like distribution board - but with only 4 connectors instead of 5.

Power Connector
The standard inter-connector used by STS is a Tyco Rectangular 4 pin Connector. The body and pins are sold separately.
Pin & Socket Connectors PLUG W/O EAR 4P inline is PN: 770078-1
Pin & Socket Connectors 24/18 AWG TN/BR SKT is PN: 770146-1
Pin & Socket Connectors RECPT 4P DETENT LOCK in-line is PN: 770075-1
Pin & Socket Connectors 24/18 AWG TIN/BRASS is PN: 770147-1
The PSD has the female connectors.

Pin 1 is at the point. Pin 4 is at the flat (for both male and female).
Pin 1 = Ground 1, Black
Pin 2 = -12V, White
Pin 3 = Ground 2, Green
Pin 4 = +12V, Red

STS also uses a 5 pin XLR connector for power distribution. Coming from the power supply (PS4 for example) is a 5 pin female XLR. It is intended to be plugged into a panel mount 5 pin male XLR connector which then terminates to a male Tyco Connector (for plugging in power to the PSD). I used an Aphenol panel mount 5 pin male XLR connector, PN: AC5MDZ for a replacement part and it worked fine.
Here is what my PS4 XLR connector pinout is (note, I am not sure if this is standard or not, i would assume it is, but I dont want to be responsible for plugging anything in backwards):
Pin 1 = +12V, Red
Pin 2 = Ground 1, black
Pin 3 = -12V, White
Pin 4 = Ground 2, green
Pin 5 = Not Connected

PS2a Specs
the PS2a is a line lump, laptop type power supply. It is manufactured by Jerome Industries (Elizabeth, NJ). Their part number appears to be MIKS20-14 and has "Serge Power Supply" written on it. It appears to be a switching type power supply and can be switched from 115VAC to 230VAC inputs
12V @ 350mA
-12V @ 350mA
Fuse Type (T). 250mA, 250V.

PS4 Specs
Inside of a custom case (LMB boxes LINK maybe?) is a condor linear power supply model HAA15-0.8-A+
Technical/Catalog Information for the HAA15-0.8-A+
Vendor - SL Power Electronics Manufacture of Condor/Ault Brands
Power (Watts) - 24W
Voltage Output - ±15V (for Serge Panels, it is set to +/-12V)
Voltage Input - 100, 120, 220, 240VAC
Power Supply Type - Linear, Regulated (Open Frame)
1st Output - +15 VDC @ 800mA (This number should be a bit higher at 12V)
2nd Output - -15 VDC @ 800mA (This number should be a bit higher at 12V)
Mounting Type - Chassis Mount
Size / Dimension - 6.5" L x 4" W x 1.62" H (165.1mm x 101.6mm x 41.2mm)
Operating Temperature - 0°C ~ 50°C
Efficiency - 55%
Applications - Commercial
Line Regulation - ±0.05%
Load Regulation - ±0.05%

It is wired to an on/off switch and on LED indicator (wired to the -15V rail). The output is a 5 pin XLR with the following pinout: (coming soon).

Serge First Aid
from various sources including: cebec on quadslope,

ICs/Opamps
LM3900N – Used in NTO, DTG, TWS, WMX and many older modules
CA3080AE – Used in PCO, NTO, WMX, SSG and old filters and VCAs.
CA3280AE – Used in ACPR, UAP, 2VCA, RING, QUO, WAD.
CA3046 – Used in NTO, PCO, WAD, PRNV, PHA and old UPAP & NEG.
CA3096 – Used in 2VCA, PRNV
CD45208E
LM711(?) – Used in NTO/PCO
Reticon SAD 1024 BBD - Rare. Used in WAD.

Common Opamps
LM324N – CV opamp
LF353 – FET opamp
NJM4559D – audio opamp
NE5532 – audio opamp
741 – opamp (NTO, SSG)

Common Transistors
NP4250s and 2N5089s are the common PNP and NPN.

Pots
16mm Alpha. 50K lin for CV and 50K log for audio

Wire
STS use Mogami for all internal wiring

Banana jacks
E.F. Johnson and 3.5mm and 1/4″ jacks are Switchcraft

Vactrols
the phasers (PHA and 2PHA) use VACTEC Vactrols

Other Info
Banana Cables
Pomona PVC Stacking cords on www.testpath.com

Hardware
The bolts that secure the panels to the boats are 6-32 bolts.

Knobs
Davis 1900H
clones of the knobs can be purchased at Small Bear Electronics. Multiple colors also available.

recommended power conditioner
DUET POWER CENTER
bwhittington
Wow, now this should definitely get stickied. Great post, Ryan!

Cheers,
Brian
parasitk
Done. Let's just fill the thread with useful info!

I think b3nsf has some calibration info about the TKB...
daves
There is too much wrong info about the Serge going around. I didn't look at every detail, but for starters:

PS2a is NOT a switching supply, it is a semi-custom linear supply.
Banana jacks are NOT Johnson, they are a higher end jack with a perfectly circular metal insert, as opposed to the cheap squarish insert in Johnson jacks.
nitro2k01
daves wrote:
Banana jacks are NOT Johnson, they are a higher end jack with a perfectly circular metal insert, as opposed to the cheap squarish insert in Johnson jacks.
Now, this turned out to be pretty difficult to research online, since there's someone called Jack Johnson who has made a song called Banana Pancakes.
sad banana Dead Banana Dead Banana

(Ok, I lied. You can actually -pancakes -pancake to the search...)
daves
HAHA!
metasonix
Just let me drop in a small warning:

Many of the ICs that Rex is still using in the classic Serge circuits are no longer in production. I suspect they will become very difficult to find in coming years, like the Curtis and SSM chips used in many popular synths. Most likely, Rex was smart enough to make quantity purchases for the near future. After that, who knows.

For example:

LM3900
LM711

All of these are still shown on the Intersil site, but are all marked "out of stock", with no information on future production.
I can't find any evidence that other firms, like ST or National, are still making them.
CA3080
CA3280
CA3046
CA3096

The SAD1024 BBD has been out of production for a long time. EG&G Reticon, the original maker, was bought by PerkinElmer in 2000 and subsequently disappeared. Ironically, PerkinElmer Optoelectronics is still making Vactrols---but not CCD chips. I routinely see people on guitar-pedal forums, begging to buy an SAD1024 for maintenance purposes. It is extremely scarce.

The situation on discontinued ICs is similar to what I've found about discontinued tubes--if an item was popular and found wide use in commercial and industrial electronics, old stock can be scraped up long after the factory is demolished. I can still buy thousands of arcane things like 19KG8s, presently being used in the R-54 Supermodule, because they were made in the millions for low-cost TV sets. However, unlike the 19KG8, with the end of production of a popular chip used in music gear, great uncertainty ensues. Look at what happened to the VF14 tube used in the U47 microphone. Or the 6386 used in the Fairchild 670 limiter--they became so scarce, JJ Electronic made a limited production run of them. Lucky 670 owners! (They sell for $120 in the US.....sorry, 670 owners...)

So, even though people love Serge products, it is quite possible that they will be costly and difficult to maintain in the near future.
zthee
I don't think the LM711 goes in the NTO/PCO - It's normally a TL710?

Which is also out of production...
djs
Is there a functional difference between the LM3900 and the LM3900N (which Mouser shows several thousand in stock)?
Seracs
metasonix wrote:
Just let me drop in a small warning:

Many of the ICs that Rex is still using in the classic Serge circuits are no longer in production. I suspect they will become very difficult to find in coming years, like the Curtis and SSM chips used in many popular synths. Most likely, Rex was smart enough to make quantity purchases for the near future. After that, who knows.

For example:

LM3900
LM711

All of these are still shown on the Intersil site, but are all marked "out of stock", with no information on future production.
I can't find any evidence that other firms, like ST or National, are still making them.
CA3080
CA3280
CA3046
CA3096

The SAD1024 BBD has been out of production for a long time. EG&G Reticon, the original maker, was bought by PerkinElmer in 2000 and subsequently disappeared. Ironically, PerkinElmer Optoelectronics is still making Vactrols---but not CCD chips. I routinely see people on guitar-pedal forums, begging to buy an SAD1024 for maintenance purposes. It is extremely scarce.

The situation on discontinued ICs is similar to what I've found about discontinued tubes--if an item was popular and found wide use in commercial and industrial electronics, old stock can be scraped up long after the factory is demolished. I can still buy thousands of arcane things like 19KG8s, presently being used in the R-54 Supermodule, because they were made in the millions for low-cost TV sets. However, unlike the 19KG8, with the end of production of a popular chip used in music gear, great uncertainty ensues. Look at what happened to the VF14 tube used in the U47 microphone. Or the 6386 used in the Fairchild 670 limiter--they became so scarce, JJ Electronic made a limited production run of them. Lucky 670 owners! (They sell for $120 in the US.....sorry, 670 owners...)

So, even though people love Serge products, it is quite possible that they will be costly and difficult to maintain in the near future.


Might ask about this in the future, but I'm sure he has something thought up as a solution.
zthee
djs wrote:
Is there a functional difference between the LM3900 and the LM3900N


No difference.
cebec
Seracs wrote:
metasonix wrote:
Just let me drop in a small warning:

Many of the ICs that Rex is still using in the classic Serge circuits are no longer in production. I suspect they will become very difficult to find in coming years, like the Curtis and SSM chips used in many popular synths. Most likely, Rex was smart enough to make quantity purchases for the near future. After that, who knows.

For example:

LM3900
LM711

All of these are still shown on the Intersil site, but are all marked "out of stock", with no information on future production.
I can't find any evidence that other firms, like ST or National, are still making them.
CA3080
CA3280
CA3046
CA3096

The SAD1024 BBD has been out of production for a long time. EG&G Reticon, the original maker, was bought by PerkinElmer in 2000 and subsequently disappeared. Ironically, PerkinElmer Optoelectronics is still making Vactrols---but not CCD chips. I routinely see people on guitar-pedal forums, begging to buy an SAD1024 for maintenance purposes. It is extremely scarce.

The situation on discontinued ICs is similar to what I've found about discontinued tubes--if an item was popular and found wide use in commercial and industrial electronics, old stock can be scraped up long after the factory is demolished. I can still buy thousands of arcane things like 19KG8s, presently being used in the R-54 Supermodule, because they were made in the millions for low-cost TV sets. However, unlike the 19KG8, with the end of production of a popular chip used in music gear, great uncertainty ensues. Look at what happened to the VF14 tube used in the U47 microphone. Or the 6386 used in the Fairchild 670 limiter--they became so scarce, JJ Electronic made a limited production run of them. Lucky 670 owners! (They sell for $120 in the US.....sorry, 670 owners...)

So, even though people love Serge products, it is quite possible that they will be costly and difficult to maintain in the near future.


Might ask about this in the future, but I'm sure he has something thought up as a solution.


Yes, if you ask him, he says he has purchased enough to service any existing STS stuff.
Seracs
No problem then.
BananaPlug
Quote:
Yes, if you ask him, he says he has purchased enough to service any existing STS stuff.

If you're making long term plans I wouldn't count on getting service done beyond the first year or so. You can accept some attrition, find a tech person (get references), or DIY (not a decision to take lightly). Having rare parts without sorting that out won't fix your panel.
xart
I have seen Rex zez inventory on out of production chips.....we have no worries. He has us covered till long after our death! thumbs up





cebec wrote:
Seracs wrote:
metasonix wrote:
Just let me drop in a small warning:

Many of the ICs that Rex is still using in the classic Serge circuits are no longer in production. I suspect they will become very difficult to find in coming years, like the Curtis and SSM chips used in many popular synths. Most likely, Rex was smart enough to make quantity purchases for the near future. After that, who knows.

For example:

LM3900
LM711

All of these are still shown on the Intersil site, but are all marked "out of stock", with no information on future production.
I can't find any evidence that other firms, like ST or National, are still making them.
CA3080
CA3280
CA3046
CA3096

The SAD1024 BBD has been out of production for a long time. EG&G Reticon, the original maker, was bought by PerkinElmer in 2000 and subsequently disappeared. Ironically, PerkinElmer Optoelectronics is still making Vactrols---but not CCD chips. I routinely see people on guitar-pedal forums, begging to buy an SAD1024 for maintenance purposes. It is extremely scarce.

The situation on discontinued ICs is similar to what I've found about discontinued tubes--if an item was popular and found wide use in commercial and industrial electronics, old stock can be scraped up long after the factory is demolished. I can still buy thousands of arcane things like 19KG8s, presently being used in the R-54 Supermodule, because they were made in the millions for low-cost TV sets. However, unlike the 19KG8, with the end of production of a popular chip used in music gear, great uncertainty ensues. Look at what happened to the VF14 tube used in the U47 microphone. Or the 6386 used in the Fairchild 670 limiter--they became so scarce, JJ Electronic made a limited production run of them. Lucky 670 owners! (They sell for $120 in the US.....sorry, 670 owners...)

So, even though people love Serge products, it is quite possible that they will be costly and difficult to maintain in the near future.


Might ask about this in the future, but I'm sure he has something thought up as a solution.


Yes, if you ask him, he says he has purchased enough to service any existing STS stuff.
cebec
BananaPlug wrote:
Quote:
Yes, if you ask him, he says he has purchased enough to service any existing STS stuff.

If you're making long term plans I wouldn't count on getting service done beyond the first year or so. You can accept some attrition, find a tech person (get references), or DIY (not a decision to take lightly). Having rare parts without sorting that out won't fix your panel.


I'm not worried at all. He will repair any STS product in existence or yet to come and Kevin Braheny Fortune is handling all non-STS stuff. We're in good hands!

One of the reasons we pay big bucks for STS/Serge is so he has the buying power and clout to stock up on hard-to-find through-hole parts.

Additionally, when I compiled that list (posted above), it was based on a couple of Oakland STS panels and my discussions with a DIY'er very familiar with older (pre-STS) Serge. I know Rex has made adjustments and substitutions as he transitioned to Hartland and now the M-odules so some of that is going to be out of date, unfortunately.
BananaPlug
rastko wrote:
I am sorry if this is a double post but this is the first time I see this .

http://www.serge.synth.net/

thank you Ken Stone

Has kit instructions (for PCB to panel wiring) and manuals. The 1978 manual shows where the NTO/PCO 1V/O tracking pot is (bottom of PCB).
emergencyofstate
Anyone have any updated info on recommended power conditioners? It appears the Duet Power Center is discontinued.
rdonker
I'd like some info on tuning. Process and procedure.
hydrophilos
I just bought multiples of virtually every chip that was mentioned here (in terms of Serge modules) including the SAD1024 BBD on ebay...

Not sure how long that will last but right now everything seems available.
macumbista
First off, can't say thanks enough for all this. Really a resource.

Second off, does anybody have the pin-out for the 5-pin XLR connections on the PS4A/PS6A?

EDIT: Sorry, I'm blind, found it...

Thanks!
AntManBee
Pomona patch cords use the part# formula B-4-5 where the middle number is the length in inches and the end number is the colour (so this example is a 4" green cable) with the following colour codes.

0=black
1=brown
2=red
3=orange
4=yellow
5=green
6=blue
7=violet
8=grey
9=white

Available from Testpath & Mouser in the US and Mouser in the UK/EU.
AntManBee
Rack ear bolts are #8 / 32 TPI (which for those outside the USA is 8UNC as they have a US thread size).
Spridleyman
A couple of things:

Black banana sockets are not necessarily AC coupled. I think the original definition was black = bipolar (swings + and -) while blue = positive only (CV). But the rules are not firm - some CVs can go negative etc. Many black inputs are AC coupled, but most black outputs are not.

Examples of where this matters - the VCFQ can be used as a CV processor, the you can "hold" the QUO output at whatever voltage it's currently at, the bipolar output option on the DUSG works as an inverted envelope etc.

Second thing, many of the first generation modules require an additional 6v supply. This will only matter if you buy a pre 1980 panel. Originally there was an extra 6v regulator on the power supply, but later if systems only had one 6v module then a 6v regulator would be mounted somewhere in the panel. So, if you buy an early Serge and none of the VCAs work, check your power supply is suitable...



Steve
komputerbrown
great thread! thanks! Guinness ftw!

but what about the rack ears? where can one get a pair of those?
phisynth
here's the graphical file I made to have some made at a local metal workshop here. The only thing is they made it from a folded 3 mm alu plate, so the angle is slightly rounded instead of being sharp, but I guess it can be made sharp also if you ask them specifically (I didn't).
Other than that hole placement is perfect, and they look ok. They cost me less than 6€/piece.
Dimensions are in mm tho...
komputerbrown
wow!

thanks phisynth!

i'll definitely try to find a local metal workshop now!

we're not worthy
ear ear
daves wrote:
There is too much wrong info about the Serge going around. I didn't look at every detail, but for starters:

PS2a is NOT a switching supply, it is a semi-custom linear supply.
Banana jacks are NOT Johnson, they are a higher end jack with a perfectly circular metal insert, as opposed to the cheap squarish insert in Johnson jacks.


What banana jacks do STS use?

EDIT: Johnson, according to this thread.
Baszline
komputerbrown wrote:
great thread! thanks! Guinness ftw!

but what about the rack ears? where can one get a pair of those?


I've ordered and received Serge style rackears here (thanks to MechaSeb):
http://www.takachi-el.co.jp/data/pdf/10-27_01.pdf
The right reference is: M-177S

PSU case is from LMB and can be found here (unfortunately only US it seems... :(
http://www.lmbheeger.com/products.asp?catid=16
komputerbrown
Thanks Baszline!

Link didn't work for me, but it's these, right?
prscrptn
Just contact Takachi Electronics.

Email:overseas@takachi-el.co.jp

The item number is: M-177s thumbs up
komputerbrown
thanx prscrptn!

but i needed to know where the screw holes should be because my man up north who i'm buying a panel off right now kindly agreed to drill those for me =)
prscrptn
Phisynth has a diagram above with all of the necessary info. thumbs up
rastko
The Serge panels use these TINI-JAX`s (*edit* not sure this is actually TINI-JAX`s so maybe I should have written Switchcraft jacks) connectors:

http://ch.mouser.com/ProductDetail/Switchcraft/142AX/?qs=sGAEpiMZZMsUz hEcHltCuS/EukbAEpLw

These are 'normaled' to the banana inputs on the Wilson Analog Delay , Frequency Shifter and Resonant Equalizer.

IF A 3.5 MM JACK (euro patch cable) IS USED IN THESE CONNECTORS THE SHAPE CAN BE BENT RESULTING IN THE BANANA JACK NOT RECEIVING SIGNAL ANY MORE !

It is possible to bent it back into shape with a small wooden stick , you have to open the panel and do it from the inside. But in my case it will be easier just to replace it with a new one.

Imagine that I used this conector once , one day before the performance and exactly this happened :-).

This info was somewhere on QuadSlope but I just forgot it.
nrdvrgr
Never heard of TiniJax being damaged by 3.5mm cables, only the opposite (TiniJax male damaging 3.5). I am using TipTop Stackables with no issues whatsoever.
prscrptn
Switchcraft jacks are 1/8" which = 0.1250 inches or 3.175mm.

Euro cables are typically 3.5mm which = 0.1377952755905512 inches.
rastko
nrdvrgr wrote:
Never heard of TiniJax being damaged by 3.5mm cables, only the opposite (TiniJax male damaging 3.5). I am using TipTop Stackables with no issues whatsoever.


just edited my post so it says Switchcraft jacks as I am not sure that they are TiniJax .
TiniJax is written on a ebay site if you search for this part but it could be wrong.

What I know is that I plugged a Doepfer cable into the Resonant EQ and the banana plug stopped working.
Most of the other info is from REX so I thought that this should be known.

prscrptn wrote:

Posted: Tue Oct 16, 2012 4:25 am Post subject:
Switchcraft jacks are 1/8" which = 0.1250 inches or 3.175mm.

Euro cables are typically 3.5mm which = 0.1377952755905512 inches.


Yes, this is what happened and I thank you for the extra info.
nanotone
Tini-Plugs are made by Switchcraft and the have got 0.14" diameter. This equals 3,56 mm.
fowl
For those that have 80's Panels - from Height, SF
The old Power cord can be changed for a Male Molex - as its still +/- 12V
The Wiring should be:
RED: + 12
WHITE: - 12
BLACK: Audio Ground
GREEN : Chassis Ground
- as mentioned before some of the older panels - required the 6v.... check with Rex.

FURTHER NOTES :

POWER DISTRO:
If you have it horizontal with Green LCD to your left and Amber to your Right
Then the PSU should hang off 4. Rex says its best to keep your oscillators on away from your Controllers - so the Osc. to the left and Control to the Right.

EXPERIMENTING:
From Rex: As long as you keep the current to under 20 Ma and don't exceed rails (+/- 12v) - there is no reason why you can't insert any kind of (synth or non-musical) signal into your chain... use your imagination...

KEEP ON TRUCKING
fowl
Useful info for those buying End Cheeks (wheedywhizz is great) to mount their Serge in-
- 8-32UNC x 3/4Inch screws for modules
- 6-32UNC x 3/4"inch screws for mounting Power Distro Board
richard
anybody know what those red switches with a metal skirt are that Rex uses for the Seq A and Programmer?
richard
so they are Johnson banana jacks or they ain't?
tmeade
richard wrote:
so they are Johnson banana jacks or they ain't?


No. I ordered the Johnsons. The metal contact is diamond shape, not round like the ones that Rex uses. Also, I ordered blue ones and they don't match either Oakland or hartland blue.
jzilla
Great thread... Can someone tell me what the smaller screws connecting the circuit board to the panel are? Not the six that connect the panel to the enclosure but the four connecting from the panel to the boards.

Thanks,
-j
weerzin
can anyone tell me what the three-way switches on the sts-serge mixers are?

thanks very much in advance!
cheapmachines
For people in the UK/EU looking for bolts to connect rack ears to boats and mount a PSD, I've found that the threads on the 8-32's from here work with my threaded 4.5" boat for rack ears:

http://www.westfieldfasteners.co.uk/A2_ScrewBolt_PhilRaPan_UNCoarse_0. 1640.html

And the 6-32's are the right thread for the PSD mounting:

http://www.westfieldfasteners.co.uk/A2_ScrewBolt_PhilRaPan_UNCoarse_0. 1380.html

The other UNC's are here:

http://www.westfieldfasteners.co.uk/UNC.html
cheapmachines
weerzin wrote:
can anyone tell me what the three-way switches on the sts-serge mixers are?


Three way switchable phase inversion on that input:



"This has switchable phase inversion on the first channel to aid in feedback experimentation (avoiding cancellation)or you can "subtract" one waveform from another."
steamroom
Sorry for the relatively simple question...
I have an old paperface system with it's own power supply, and then STS panels. I want to use the paperface panels on the STS power supply (uses the same connectors) but before i do, i want to make sure the old power supply is putting out the same power sources to each pin. How do i use a volt meter to read what is being put out by the old power supply?
thanks again so much in advance...
putney
tarissuoc
Hey Steamroom

steamroom wrote:
How do i use a volt meter to read what is being put out by the old power supply?
putney

You do that carefully, we can't afford losing you!

You may find some answers in this great post by Muff Wiggler :
https://www.muffwiggler.com/forum/viewtopic.php?t=1200
Hope that helps!

E
steamroom
Thanks! I don't want to lose me either! haha
thanks
putney
weerzin
cheapmachines wrote:
weerzin wrote:
can anyone tell me what the three-way switches on the sts-serge mixers are?


Three way switchable phase inversion on that input:



"This has switchable phase inversion on the first channel to aid in feedback experimentation (avoiding cancellation)or you can "subtract" one waveform from another."


sorry if that was confusing. what i meant was: "which brand/model are those switches?"

i'd like to get a few spares. thanks!
cheapmachines
weerzin wrote:
sorry if that was confusing. what i meant was: "which brand/model are those switches?"


Ha! Thought it was a weird question, given the size of your setup hihi

Sorry for the confusion.
Unitmo
Hi.

I am a new member here. News anybody a simple DiY Format Jumbler between Serge and Eurorack? Connection Diagram? PCB? seriously, i just don't get it

Tanks a Lot.

Chris
phisynth
Hi

can anyone point me to the right Mouser ref # for a replacement of the frequency pot on the Serge PCO ?

I know they're alpha 50K pots, I guess they are LIN, but I got plenty of results using only these specs with the Mouser search engine, not sure which one to choose seriously, i just don't get it

Thanks in advance

Ph.
J3RK
I believe they are these: http://www.mouser.com/ProductDetail/Alpha-Taiwan/RV16AF-10-15R1-B50K/? qs=sGAEpiMZZMtC25l1F4XBU1Dxzr6mc3JG65EyQqJg3Eo%3d

The picture shows spline-type, but these are actually round as you'd use with Davies knobs. These are the ones that I typically use for everything including Serge-ish work.
KNYST
M-class measurements:
an M-class module is 7.875" wide (height is 7")

Vsyevolod wrote:
The screws that mount the panel to the box are 6-32 x 3/8" pan head Phillips with washer. The panel holes are drilled over-size at 13/64" and are not threaded.

The screws that mount the PC board standoffs to the panel are 4-40 x 9/32" pan head Phillips with washer. The panel holes for these are drilled over-size at 9/64" and are not threaded.

The screws that mount the Obelisk to the panel are 6-32 x 3/8" with a 5/64" Allen head in black. Holes are drilled over-size at 9/64” and are not threaded.

Stephen


Obelisk, width, etc:
Vsyevolod wrote:
The Obelisk is actually 1 7/32". You will notice that two M-Class modules + Obelisk is ever so slightly narrower than a single full sized panel.

Vsyevolod wrote:
Also, if you're planning on having the Obelisk, minimum depth to your box is 2 1/2".


Good to know for anyone combining M-class with DIY cool

Thanks Stephen!
weerzin
i'm looking for a replacement case for my beat-up PS4 (not PS4A)..

can anyone confirm that this is what STS uses?

Model# C0-4A

from
http://www.lmbheeger.com/products.asp?catid=16

judging by the measurements (8x7x4) and the color, this should be the one, but it would be good to get a confirmation in case anyone here has ordered one..

thanks!
microtonal
weerzin wrote:
i'm looking for a replacement case for my beat-up PS4 (not PS4A)..

can anyone confirm that this is what STS uses?

Model# C0-4A

from
http://www.lmbheeger.com/products.asp?catid=16

judging by the measurements (8x7x4) and the color, this should be the one, but it would be good to get a confirmation in case anyone here has ordered one..

thanks!


Confirmed. I used the LMB Heeger C0-4A case for a DIY Power Supply for an older Serge with +6V, and the case matches my STS PS4 power supply cases.
weerzin
microtonal wrote:

Confirmed. I used the LMB Heeger C0-4A case for a DIY Power Supply for an older Serge with +6V, and the case matches my STS PS4 power supply cases.


excellent. thank you!
Dberg
Hey STS Serge modular brothers and sisters, I recently put in an order for banana cables from Testpath, and realized how much time it can take to dig for the right part numbers. I compiled this list based on the standard STS Pomona cable length color scheme to save myself some time in the future, and figured I'd share:

Grey B-4
http://www.testpath.com/Items/Patch-Cord-Banana-Plug-Stacking-PVC-15A- 4-GRY-114-901.htm

Green B-8
http://www.testpath.com/Items/Patch-Cord-Banana-Plug-Stacking-PVC-15A- 8-GRN-114-938.htm

Yellow B-12
http://www.testpath.com/Items/Patch-Cord-Banana-Plug-Stacking-PVC-15A- 12-YEL-114-853.htm

Red B-18
http://www.testpath.com/Items/Patch-Cord-Banana-Plug-Stacking-PVC-15A- 18-RED-114-864.htm

Blue B-24
http://www.testpath.com/Items/Patch-Cord-Banana-Plug-Stacking-PVC-15A- 24-BLU-114-878.htm

Purple B-36
http://www.testpath.com/Items/Patch-Cord-Banana-Plug-Stacking-PVC-15A- 36-VLT-114-890.htm
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