[HAM] Making Vib/chorus and normal channel equally bright

[Dominik ter Meer]

Hi there,

there is a chap out there selling an e-book on ebay concerning mods and maintenance of console organs (see link to homepage of this guy). He states, that there is a mod to make the normal channel equally as bright sounding, as the Vib/Chorus channel. 

I took a look at the schematic and the only way I figured this could be done is by bypassing the 820k series-resistor (R9) after V1 of the normal channel with a small capacitor. This would form a highpass filter, thus one could get a brighter sound (with the loss of bass though).

The other difference between the circuit of the pentodes of the normal and chorus-channel (V1 and V2) is the amount of local negative feedback (R4,R5 and C2 in case of V1 and R13, R14, C7, R15 on V2). 

Has anybody done the mod as per the mentioned e-book http://www.hammondb3andleslietips.com/
and if so, what is involved with it, does it work?

Cheers,

Dominik


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