Adding a volume control to cornet classic

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Tone Deaf

Adding a volume control to cornet classic
« on: 23 Nov 2005, 05:05 pm »
Hi to all.

I'd like to add a volume control to my cornet classic & dispense with my linestage.  I don't need so much gain.

Ideal spot looks like between V2 & V3, & I was thinking of just lifting 1 leg of R8 to break into the circuit (so if it hums like hell I can easily undo the mod!)

Does this seem like a sensible idea?  Is a 50k pot okay?  Or are things not so simple when you actually know what you're doing?!  

Thanks for the advice
TD

hagtech

Adding a volume control to cornet classic
« Reply #1 on: 23 Nov 2005, 06:51 pm »
You will end up messing the EQ.  The circuit depends on the high impedance of V3 to work properly.  Also, this node is nowhere near ground.  The dc output from V2 provides the dc bias for V3.

To install a pot, you'd have to capacitively couple to the attenuator (pot), then capacitively couple again up to a newly biased V3.  All of which load down the EQ and mess it up.

Frankly, there is no good way to do this in a Cornet.  

jh :)

Tone Deaf

Adding a volume control to cornet classic
« Reply #2 on: 24 Nov 2005, 08:32 am »
Thanks.  Okay, I won't do that one then!
TD