[IN STOCK] L-1 Tube VCA (Mouser card added page 24)

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L-1
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[IN STOCK] L-1 Tube VCA (Mouser card added page 24)

Post by L-1 » Tue Aug 28, 2012 7:12 am

Info here: http://l-1.su/TubeVCA.html


TUBE VCA / DISTORTION / WAVESHAPER / TIMBRAL GATE / etc.

Finally, after two months of waiting for Farnell's license, I finished to build a prototype of Tube VCA. This design is inspired by Ken Stone's Tube VCA and based on 60s-70s soviet tube 1Ж24Б. (I've contacted with Ken and got his blessing. Hi specified to write 'inspired by' since it's modified unofficial release. Thanks Ken for help and sharing!)
I considered the mods described at e-m forum, Thanks to PrimateSynthesis for that great work http://electro-music.com/forum/topic-26469.html .
The project will be available as PCB + panels + tube set in October. Boards will be 2mm black/gold of course.
I've bought 100 1Ж24Б 'new old stock' tubes from an old man from Murmansk. So tubes quantity is limited. Some tubes have 'tested for military use' stamp and they will go to first buyers.
Here are photos, schematic and PCB. The prototype works & sounds perfect.
The device has feedback loop which is normaled to IN2 jack, so IN2 pot controls feedback amount when nothing feed into IN2 jack and feedback switch is on. When jack feed into IN2, IN2/FEEDB pot controls IN2 level. Distortion/clean switch controls two modes with more or less distortion which amount can be trimmed with trimpots through holes at panel. Drive/IN1 pot controls IN1 level. GAIN pot controls gain offset. CV pot controls gain CV level.


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Last edited by L-1 on Tue Nov 19, 2013 9:13 am, edited 4 times in total.

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frequencycentral
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Post by frequencycentral » Tue Aug 28, 2012 7:26 am

Great looking build! As it happens I have a tube VCA on my breadboard at the moment, but I'm using 2 x Sylvania 5840. This is the tube you're using?

http://www.radiomuseum.org/forum/1p24b_v_1p24b_v.html

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L-1
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Post by L-1 » Tue Aug 28, 2012 7:32 am

I've placed on a panel 1Ж24Б. Great soviet mini-tube.

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otherunicorn
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Post by otherunicorn » Tue Aug 28, 2012 7:34 am

cool! looks good.
You got that resistor in backwards...

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Post by Memory_Leak » Tue Aug 28, 2012 7:47 am

nice design L-1 maybe grab one :)
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Post by spbaker » Tue Aug 28, 2012 7:53 am

:sb: That's really nice!
Will the kit be surface mount stuff? Or thru hole?

Any idea of cost?

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Post by L-1 » Tue Aug 28, 2012 7:55 am

I will offer SMD air soldering service - 10$ per board, it's for parts and my work.

The device can work from 15V with minor changes.

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Post by Kalerne » Tue Aug 28, 2012 7:57 am

want want want ! :love:

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Post by ringstone » Tue Aug 28, 2012 8:05 am

Oh... Wow! That does look very nice!

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Post by theabsent » Tue Aug 28, 2012 8:11 am

I was going to order a second CGS Tube VCA soon. Now it will be on hold until october : )
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Post by raisinbag » Tue Aug 28, 2012 8:53 am

Super cool, When it is ready do we buy from web site or like a group buy kind of situation?

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Post by L-1 » Tue Aug 28, 2012 8:57 am

I will inform. Buy from site. Any pre-pay.

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Post by mono-poly » Tue Aug 28, 2012 9:29 am

Awsome want it!
Any news about the vactrol filter?
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Post by L-1 » Tue Aug 28, 2012 9:49 am

Any news about the vactrol filter?
Boards are on order. They have delivery time 25-30 days. So I think second half of September I will get them.

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Post by simfonik » Tue Aug 28, 2012 10:43 am

I'd like one of these. I really like that you're putting back panels on your designs.

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Post by ikkini » Tue Aug 28, 2012 10:48 am

:love: :love: :love:

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Post by jeannot » Tue Aug 28, 2012 11:09 am

Nice work, also love the back panel. Would definitely be interested in one...or three :tu:

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Post by marvkaye » Tue Aug 28, 2012 11:21 am

Sorry for the stupid question, but what is the advantage/disadvantage to the tube VCA vs one that is all solid state?

<m>

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Post by Peake » Tue Aug 28, 2012 11:35 am

Thanks L-1, and thank you Ken!

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Post by L-1 » Tue Aug 28, 2012 11:37 am

marvkaye wrote:Sorry for the stupid question, but what is the advantage/disadvantage to the tube VCA vs one that is all solid state?

<m>
A tube gives very nice sound coloring and overdrive / distortion. Will record samples soon.

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Post by regenbot » Tue Aug 28, 2012 11:46 am

I'd like one if i get the tube too. Great looking modules :yay:

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Post by mOBiTh » Tue Aug 28, 2012 11:55 am

Is the tube hardwired here?

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Post by L-1 » Tue Aug 28, 2012 11:59 am

Yes, but I made pads suitable for MTA-100 headers, so it can be made removable.

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Post by defenestration » Tue Aug 28, 2012 12:25 pm

wow L-1 you are trying to take all my money!

looks like the 1J24B tubes are pretty widely available? I would assume no one is making them new manufacture though?

what's the current draw? looks like 12hp?

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Post by transistor logic » Tue Aug 28, 2012 1:32 pm

nice project , might be up for one !!

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