HOHNER - Tri-Dirty Booster  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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sinner
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Post by sinner »

Any chance for schematics guys? As I heard it's basically BMP with odd values, but I would love to know the details

Cheers

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edkoppel
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Post by edkoppel »

It's my favorite Muff-based pedal.
Just totally kills anything else I have tried/

These are pics from the one sir hc had:
https://s3.photobucket.com/albums/y57/c ... G_0221.jpg

https://s3.photobucket.com/albums/y57/c ... G_0219.jpg

https://s3.photobucket.com/albums/y57/c ... G_0218.jpg

https://s3.photobucket.com/albums/y57/c ... G_0223.jpg


The one I have is just a little bit different, so I will have to open her up and take a few pics for ya.
-ed
Tone Machines: vintage effects blog:
http://tonemachines.blogspot.com/

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Post by edkoppel »

also a post from Kit Rae on the subject:

I agree 100%. The one you have has the same circuit as mine. It actually sounds a bit better than any EHX V1 I own. The component values on this version are not really all that different from a V1 I own, but they did add an extra cap in the TDB coming off of lug 1 of the tone pot. There is also a cap and resistor swapped in the second gain stage, though I don't think that makes any difference. I think this is just a good set of components values in the right places.
Tone Machines: vintage effects blog:
http://tonemachines.blogspot.com/

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Post by CHEEZOR »

Where can I hear one? :)

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sinner
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Post by sinner »

edkoppel wrote:It's my favorite Muff-based pedal.
Just totally kills anything else I have tried/

These are pics from the one sir hc had:
https://s3.photobucket.com/albums/y57/c ... G_0221.jpg

https://s3.photobucket.com/albums/y57/c ... G_0219.jpg

https://s3.photobucket.com/albums/y57/c ... G_0218.jpg

https://s3.photobucket.com/albums/y57/c ... G_0223.jpg


The one I have is just a little bit different, so I will have to open her up and take a few pics for ya.
-ed

That would be sweet if you help me to trace it :hug:

Yesterday afrenoon I've spend a lot of time looking for info about Foxy Ladys and came accross info about this one...

If you could take the shot of trace side that would spead up the process

Cheers :thumbsup

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Post by sinner »

Hey edkoppel, any good news for us :hug:

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Post by edkoppel »

sinner wrote:Hey edkoppel, any good news for us :hug:
oops, sorry I was in work mode the past week.
I'll take some pics tomorrow and post them up/
Tone Machines: vintage effects blog:
http://tonemachines.blogspot.com/

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Post by sinner »

Thank you good man :thumbsup

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Post by edkoppel »

well, i'm having some trouble getting the board off the bolts that are holding it on.
The tiny nuts... aren't budging and i don't want to strip them.
I did take some pics though, so maybe that'll help a little.
///
IMG_2027.JPG
IMG_2025.JPG
IMG_2026.JPG
IMG_2029.JPG
IMG_2030.JPG
IMG_2032.JPG
IMG_2033.JPG
Tone Machines: vintage effects blog:
http://tonemachines.blogspot.com/

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Post by sinner »

Knowing what it based on - that should be enough dear Sir. If you could just mark the caps for me I'll do the schemo shortly

You rocks BTW :hug: :hug: :hug:

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Post by sinner »

All pots 100k LIN?

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Post by sinner »

I'm on it right now. Is there a chance for more picts of better quality?

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Post by sinner »

Ok, so here's what I have for now

Resistor-wise no surprises - very bigmuff-ish

Cap I see are where's unusuality of Tri-Dirty Booster is, some 22nF are clearly seen, I'm not sure values of rest of them so I left it blank right now

Picts of the one posted ealier are bit different, some differences in tonestack (slightly 21k in opposite to 27k in yours), V+ to Q4 base resistor is different (410k to 370k in yours), as well as Q4 collector bias is different (8k2 to 10k in yours)

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Post by edkoppel »

i can take some better pics, what would you like me to focus on?
Tone Machines: vintage effects blog:
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Post by sinner »

edkoppel wrote:i can take some better pics, what would you like me to focus on?
Just do hell of them, different angles. If you do closeups use macro pretty please :)

Could you mark the capacitors values for me on one of those picts?

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Post by sinner »

actually... it is slightly different. One thing I never seen in BMP is there... More in a bit

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Post by sinner »

Ok, so what I did is I draw the repro board. I did it for two reasons. Firstly, to make sure connections, secondly for you edkoppel to make it easier to point out what component values are unclear

Anyway. I find out one big oddity. It's in tonestack - there is an extra cap in there (22nF) marked in green. I never seen something like that in BMP's. Perhaps someone more knowable could straight it up, my hope is you - Mictester, I know you know BMP's. Also the tone pot is connected "other way around" - so it should act in opposite way, right?

What else, ah, yeah - I wasn't sure sustain to ground resistor. It's also highlighted in green. I've marked is as a 1k, but it looks like 10k really (like in some Russian BMP's), If you could edkoppel check the color bands for me, I'll be grateful.

Also the caps - all are highlighted in red, if you could help with values for them, that would be awesome as well

Other construction differences are minor - order of cap and diodes junction in both clipping stages are swapped, as well as order of coupling cap with third stage input resistor junction

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Post by jrod »

Here's one from some pics I had seen on the internet. To me it looked like that one cap was before the tone stack.
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Post by sinner »

jrod wrote:Here's one from some pics I had seen on the internet. To me it looked like that one cap was before the tone stack.

Check the picts - it's clearly seen it's going to pot wiring

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Post by sinner »

Look here, it cant be before tonestack

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