BUILD THREAD: Vacuform Tube Filter kit

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BARD
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BUILD THREAD: Vacuform Tube Filter kit

Post by BARD » Mon Jul 27, 2020 11:49 am

Build thread for that filter.
BOM, Assembly guide and helpers:
vfmanu_a.zip
I'll gladly respond to your questions regarding build :)
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Quinie
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Re: BUILD THREAD: Vacuform Tube Filter kit

Post by Quinie » Tue Jul 28, 2020 1:07 pm

Hi Bard,

The BOM says 100k 6 times but the kit comes with 6 times 47k (as 100k).
Does this mean the BOM will be updated to 47K?

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BARD
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Re: BUILD THREAD: Vacuform Tube Filter kit

Post by BARD » Tue Jul 28, 2020 4:43 pm

Quinie wrote:
Tue Jul 28, 2020 1:07 pm
Hi Bard,

The BOM says 100k 6 times but the kit comes with 6 times 47k (as 100k).
Does this mean the BOM will be updated to 47K?
Yep, just use those as 100k.

Quinie
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Re: BUILD THREAD: Vacuform Tube Filter kit

Post by Quinie » Wed Jul 29, 2020 3:35 pm

20200729_222205 (2).jpg
Just build the Vacuform. I done for this evening allways happy to see it starting up without the magic smoke.

I still need to calibrate it.

But without it makes allmost no sound only on bandpass and it's nearly not hearable. (out lvl pot works)
Do i have to check something or will i be allright when calibrated ?
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sirjpink
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Re: BUILD THREAD: Vacuform Tube Filter kit

Post by sirjpink » Fri Aug 07, 2020 6:46 am

Ok.. finished my build today. Generally, I was feeling quite happy building this. It is a fun build, lots of different components to keep track of. I like a lot 8-)

Image Image

The module powered up without any magic smoke escaping and I can feel and see the tubes heating up. However, I seem to have the exact same problem as @Quinie with the module not working correctly though: it will not self-resonate (tried the calibration steps) and the output with an input signal is very quiet. :help:

PS. using a Doepfer PSU3, so I'm running the 5V from the busboards as there is plenty of power.

Some specifics I noted while building:
1. Some changes in values of the parts that came with my kit.
OldNewParts
100k47kR9, R11, R13, R104, R105, R106
100u47uC9, C11, C19, C23 (pol)
10u22uC1, C2, C12, C13, C14, C15, C16, C17 (pol)
220K250KTBIAS, TROF, TRREOF
22K25KTROUT
47K50KTRCU
47u22uC22 (pol, 50V)
4M73M9R102
Perhaps @BARD can confirm?

2. Leave the standing resistors (R6, R8, R32) at the bottom of the mainboard until after you've done the IC's instead of doing them with all the other resistors. Much easier to lay the board flat.

3. C8 (big red square cap) and C27 are very close together on the pcb. Because supplied C8 is fatter than the outline, they touch. Moving C8 .5mm to the left would solve this. See picture below:
Image

4. C100 is polarized but lacks the proper marks like on the main board. Luckily the + has been printed.
Image

5. The included C8 is too tall (13.5mm) for the 12mm spacers. Used washers mount the daughterboard straighter. Might lead to connection issues with the pin headers?
Image Image

6. Added two 12mm spacers next to the jacks to connect the eurorack daughterboard to the panel as otherwise it would've left two holes. Hence the 5 brass screws on the panel instead of 3.

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