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I just finished wiring up a 5E9A Tremolux style amp today. One thing I cant figure out is how to actually "turn off" the tremolo. In the schematic, there shows an oscillator switch. I completely bypassed it in my build. As it stands, even with the tremolo jack disconnected the tremolo stays on. It sounds great and the controls function as they should, but its always there even at the lowest settings. What am i missing?
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That circuit is unusual. The Depth control won't turn the tremolo all the way off. Another builder just had an issue where the Depth control would bias the phase inverter so that it wouldn't pass a signal when the oscillator was cut off by the footswitch. Issues like this are why the circuit wasn't used in any other amp.WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
REMEMBER: Everybody knows that smokin' ain't allowed in school ! -
A couple other questions regarding the tremolo in the 5E9A:
- The paraphase inverter triodes share a common cathode resistor/cap network, which is also tied to the tremolo circuit. Could I separate the two cathodes with separate resistors and tie the tremolo to the first triode for better improvement?
- Im thinking maybe trying different phase inverter circuits in my 5E9A build. I want the tremolo to remain in tact as it is. Could I install different inverter circuits and just use the first paraphase triode as just another gain stage with the trem tied to its cathode?Comment
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If you want to try a different PI, you could put in a cathodyne with a driver stage in front, and use a blackface style LDR trem to drive the driver stage cathode - no extra tubes required, be kinda like a 5E3 but with BF trem.Or just turn it into a 5G9 - that has the best trem of these IMHOBuilding a better world (one tube amp at a time)
"I have never had to invoke a formula to fight oscillation in a guitar amp."- EnzoComment
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I want to keep the trem circuit as is. Its not perfect, but it works. Ill have to experiment, but Im wondering if I cant just leave it where its at(at the cathode of the inverting stage), turn that stage into a driver stage and experiment with different phase inverters. Im looking at the Vibro Champ schematic and noticing the trem is tied to the cathode of the last preamp stageComment
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