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Ping RS -- further G40V changes
The basic mods are done and working
very nicely -- a little advice, if you would: 1. Is it worth changing the value of R11? What's in there is much higher than Leo had it, but then again Leo used a lower-gain V1A triode and shared the cathode circuit between two channels, and if the diagrams are accurate the G40V has less than 2VDC on V1A's cathode as contrasted to Leo with 2.5VDC. 2. Could you analyze V1B's circuit and recommend some sane values for its cathode resistor and cap, assuming a 12AU7 as that triode? Others have removed C9 entirely, fwiw. With that stage switched in, in addition to a fuktonne of extra gain, there seems to be a lot of what I hear as upper midrange emphasis, e.g. "string speak" when a finger slides along a wound string is obtrusively loud to my ear and I'd like to tame that some. 3. I'm not sure of the function of C13, coming off the tone stack and right to ground -- this is another cap that others have simply removed. Keep in mind that I have decreased the tone stack treble cap to 270pF and increased the slope resistor to 52k, am still finding the treble control pretty ineffective (bass control is much improved, btw), and wouldn't mind the amp being just a tad brighter, especially in its new "Tweed" mode. Any and all help greatly appreciated -- thanks in advance! |
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