2204 + Dookie Mod

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tommymariotti
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2204 + Dookie Mod

Post by tommymariotti » Fri Jun 07, 2019 6:12 am

Dear all,
I just finished my 2204 and it works well, just a little bit noisy for me but compared to an original 2204 it seems ok.
Yesterday I modded it with the dookie mod found online. See :

PRE - https://music-electronics-forum.com/att ... 1490433584
POWER - https://music-electronics-forum.com/att ... 1490433560

After modding it, the V1 position became really microphonic and the amp is really noisy.
Is it normal? Can you help me to reduce the noise of this amp?

danman
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Re: 2204 + Dookie Mod

Post by danman » Fri Jun 07, 2019 6:46 pm

Definitely not normal for a 2204. Since the problem has just started after the mod, I would consider reflowing all the the preamp board connections and socket connections. Also hit the inputs while you are in there. I have found in the past that a bad solder joint can cause excessive microphonics like you describe. I am assuming that you have already tried new tubes in each of the preamp positions?

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neikeel
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Re: 2204 + Dookie Mod

Post by neikeel » Sat Jun 08, 2019 5:09 am

May be an issue with wiring layout too as increasing the sensitivity/gain of the preamp will up the hiss levels, and can induce PO.
Neil

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JPA
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Re: 2204 + Dookie Mod

Post by JPA » Wed Jun 12, 2019 9:30 am

These schematics of the dookie mod are not correct.

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