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Messages - ddpiax7

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Amplifier Discussion / Re: Pedal Hiss?
« on: June 24, 2021, 07:07:14 AM »
It’s got nothing to do with the converter, I put it on another 12 vdc battery and the pedals were quiet. I’m going to try a few things, but thanks for the interest!


Amplifier Discussion / Re: Pedal Hiss?
« on: June 21, 2021, 06:58:44 AM »
No, not at all. When I power it from a separate source of 12 vdc there’s no issues. It’s only when they share the common source battery.

Amplifier Discussion / Re: Pedal Hiss?
« on: June 20, 2021, 08:11:34 AM »
Not for the amplifier, just for effects pedal power. The amp is still at 12 Vcc

Amplifier Discussion / Pedal Hiss?
« on: June 18, 2021, 08:27:58 AM »
Hello all,
Recently I built a cool amp based off of a kit I purchased off of eBay from a place in Florida called Valkits. Great little amp, if you give it a push….it uses a jfet as a buffer amp with signal being taken off the source side, so zero gain, but lower impedance, into a baxandall stack into a tl071, into a tda2030a. I added a jfet preamp using a j201, with a drain voltage of about 6 volts after a 22k resistor with 12 VDC fed from a Milwaukee M12 cordless tool battery! I also added a dc to dc 12 volt to 9 volt Amazon “converter” which is just a regulator, for a source of pedal power. It works and sounds fantastic, but with my pedals ran from the same supply as the amp, I get a constant white noise hiss. You can’t hear it with signal present but it’s really annoying! When I switch pedal power to an independent source, the hiss isn’t there! Any good noise filter suggestions?

Amplifier Discussion / Pig nose 30/60 biasing
« on: February 22, 2021, 06:36:23 PM »
Hello all,
Working on a Pignose 30/60, which doesn’t have any bias or offset pots, and I just replaced the drivers and output transistors. The amp sounds great, but my background is predominately vacuum tubes so I’m not even sure whether this even matters?

If I can figure out how, I’ll post a schematic. The amp is from 1979 but the schematic is on the web.

Thanks in advance,


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