Vacuform - Vacuum tube diode SVF

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designator
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Post by designator » Mon Feb 18, 2019 3:44 am

Interested in a Euro pcb + panel + tubes set!

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paperCUT
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Post by paperCUT » Mon Feb 18, 2019 5:54 am

I'm interested in a PCB + Euro panel + Tubes!

Sounds fantastic.

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Isaiah
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Post by Isaiah » Mon Feb 18, 2019 6:28 am

BARD wrote:
Normally SVFs have a signal input and discrete LP, BP and HP outputs.
The only VCF I’m aware of that is similar to yours in this respect, is a (modified) Steiner Synthasystem/Synthacon filter, and I believe that’s a Sallen-Key topology, not State-Variable.
Whoops, seems that I referred to Sallen-Key filters as a SVF subtype for like.. 8 years? :roll: State variable filter is in fact specific type as now I can see... Thanks for pointing that!
I’m curious, how did you implement LP, BP, HP inputs (...)
It uses four vacuum diodes (2xEAA91) as dynamic resistance element and BP/HP signals are injected into intermediate stages. This is very similar to the Synthacon filter, but output / feedback amplifier is made around double triode (6N3P). :)
Ah, that’s an easy mistake to make, especially when even manufacturers use terms like “State-Variable” or “variable-state” to describe Multi-mode filters. :hihi:
Thanks for the clarification.

Will it now be possible to power this from an AC or DC external PSU via the barrel socket?
This would be a nice option for building a standalone unit in a Hammond aluminium box.
Any plans to release the tube VCA that you mentioned before? A standalone tube VCF+VCA would be great.
I guess line-level would have to amplified to 10Vp-p to get the best from this VCF, right?
What are the dimensions of the core PCB?

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BARD
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Post by BARD » Mon Feb 18, 2019 7:29 am

Isaiah wrote: Will it now be possible to power this from an AC or DC external PSU via the barrel socket?
Yes, 5V-6.3V DC/AC @ 1.1A (but better to have some headroom since tubes' filaments have ~2x lower resistance when cold)
Isaiah wrote: Any plans to release the tube VCA that you mentioned before? A standalone tube VCF+VCA would be great.
patch.audio will be releasing tube VCA very soon - but this is builded module, not DIY kit. However, I don't exclude possibility of making DIY VCA module, preferably on different tube, maybe some hated radio heptode?
Isaiah wrote: I guess line-level would have to amplified to 10Vp-p to get the best from this VCF, right?
Right :)
Isaiah wrote: What are the dimensions of the core PCB?
79mm height x 95mm width.

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Rex Coil 7
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Post by Rex Coil 7 » Mon Feb 18, 2019 10:09 am

BARD wrote: ... The PCB set (Circuit motherboard, pots / jacks daughterboard and back panel with description) will be fixed to the panel with 2 screws and Cliff jacks. Front panels will be cutted out of stainless steel
... WOW! Stainless steel!! I adore stainless steel, I use stainless fasteners and washers all over my synthesizer! Now I want to buy a Euro kit!!
BARD wrote: ... with CMYW print on them
What is "CMYW"?
BARD wrote: ... They're pretty durable and heavy ..
I would think so! I mean .. stainless steel panel yo !!

Image
BARD wrote:... I see that Front Panel Designer can import DXF Files, so it won't be a problem to make FPD file :)
Ok, that just locked in my interest. Excellent news!!
BARD wrote:Hope to finish BOM / PCB next week :) I'll also include order list in first post soon.
I'll verify my order by sending you a PM ... I just need to figure exactly what I need to buy from you first. I'm in!!
BARD wrote:Thank you for your input, Rex Coil 7!
You are very welcome! And as you are a new member ... especially one that is bringing something so useful to the membership ... I want to say to you ...

Welcome Home.
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numan7
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Post by numan7 » Mon Feb 18, 2019 11:07 am

greetings BARD! please put me down for 1 full kit and 1 pcb/tubes/eurorack-panel set.


cheers

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mOBiTh
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Post by mOBiTh » Mon Feb 18, 2019 12:53 pm

love the bard panels - I have two of the small tube modules and the finish is great!

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Eric the Red
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Post by Eric the Red » Mon Feb 18, 2019 1:06 pm

Count me in for one “basic version” - PCB and tubes!
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Rex Coil 7
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Post by Rex Coil 7 » Mon Feb 18, 2019 2:44 pm

Member *BARD ... I want to be put on the list for:

** One Tubes, Sockets, Boards kit.

** One Complete Euro kit (not assembled).

** Ship to USA.

Thank you!! :banana:
Never Quit, Die Falling Forward
5U PROJECT - (skip pages 4 through 6, boring junk) ... https://www.muffwiggler.com/forum/viewt ... highlight=

uuav
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Post by uuav » Mon Feb 18, 2019 4:28 pm

One euro core PCB (only) please !

electricanada
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Post by electricanada » Mon Feb 18, 2019 7:09 pm

I'm in for a euro kit.
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limpmeat
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Post by limpmeat » Mon Feb 18, 2019 9:56 pm

I'm in for a Euro panel/PCB/Tubes kit

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anto32
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Post by anto32 » Tue Feb 19, 2019 5:15 am

I'll take 2 x tubes, sockets, boards eurokit, please.

Anthony
Last edited by anto32 on Thu Feb 21, 2019 12:58 pm, edited 1 time in total.

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luchog
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Post by luchog » Thu Feb 21, 2019 11:17 am

I'm definitely in for a PCB+Panel+Tubes Euro set, shipping to US.

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Post by Jarno » Thu Feb 21, 2019 11:43 am

Desperately trying to resist, I have so many VCF's already, and so many other projects........
But it certainly is a really nice sounding filter! (and a stainless panel, bombproof :party: )

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BARD
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Post by BARD » Tue Mar 05, 2019 9:47 am

Short update: Waiting for arrival of first 5 PCB sets for test.
Image

uuav
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Post by uuav » Tue Mar 05, 2019 10:39 am

:love: sexy :love:

Jacks are PJ3410 right?

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yan6
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Post by yan6 » Tue Mar 05, 2019 10:49 am

Was anyone planning on sharing a 4U panel layout, Id be interested in a few

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BARD
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Post by BARD » Tue Mar 05, 2019 11:18 am

Jacks are PJ3410 right?
Jacks are Cliff FC681375V, but PJ3410s should fit too.
Was anyone planning on sharing a 4U panel layout, Id be interested in a few
Can do!

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Eric the Red
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Post by Eric the Red » Tue Mar 05, 2019 1:43 pm

Thanks for the update!
Abandon all hope, ye who wiggle.

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degeneratedsines
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Post by degeneratedsines » Tue Mar 05, 2019 3:25 pm

want :cloud:

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acgenerator
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Post by acgenerator » Tue Mar 05, 2019 6:03 pm

I would be interested in:
Eurorack kit (PCBs + Panel + Tubes + Sockets, without other parts)

I may consider upgrading to the full kit after reviewing a BOM.

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Revok
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Post by Revok » Tue Mar 05, 2019 7:15 pm

BARD wrote:
Was anyone planning on sharing a 4U panel layout, Id be interested in a few
Can do!
Sweet!

Stides
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Post by Stides » Wed Mar 06, 2019 10:05 am

Full eurorack kit please. :hail:

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dooj88
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Post by dooj88 » Thu Mar 07, 2019 11:38 am

i dont have the funds or space for another filter right now, but i have to say this sounds incredible. well done!

i'll keep an eye on this thread for progress. definitely keep that sexy purple overload indicator. really dig that.

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