Brown Princeton

[Smokebreak]

Ok thanks Deric.
What about this. Since we already put a big stopper on the cathodyne, can we use that as the "mix resistor" and insert there, as long as there is a cap on both sides to prevent DC bias leakage?

[pdf64]

Since we already put a big stopper on the cathodyne, can we use that as the "mix resistor" and insert there, as long as there is a cap on both sides to prevent DC bias leakage?

Bear in mind that a passive mixer will cut the signal level.
So if eg there's a 470k grid stopper and a 470k reverb mix resistor to the cathodyne grid (via blocking caps as necessary), the signal may be ~halved.
And then there may not be sufficient output voltage swing available from the cathodyne outputs to fully drive the power tubes.

[Smokebreak]

Good point.
Well my resistance to ground (reverb return) will be 1M3, so perhaps if I use the bottom drawing, it won't cut signal nearly so much.

Also of note on the 6G2 tremolo tip, I was a little dissappointed in the trem at high intensity settings, as I was getting a bit of raspy, nasty hash, when playing more than 1 string at a time. Not awful, but annoying. I changed the 220K limiting resistor coming off the plate of the oscillator to 820K, and it cleared up, still with plenty of intensity on tap.

[pdf64]

Good point.
Well my resistance to ground (reverb return) will be 1M3, so perhaps if I use the bottom drawing, it won't cut signal nearly so much.

OK that shouldn't cut the dry signal level much then.
But the reverb depth may be a bit lacking? Perhaps if 2 cascaded stages of reverb recovery are used it would be ok; or use a transistor in a cascode (?) arrangement with the recovery stage

[ampmike]

Nice job,small amps are what really get the most use at my house.That amp came out beautiful buddy,have fun,mikey

[Deric]

Finally I put a resistor from wiper to ground on the volume pot, and boom, there it was.

Old thread I know, but... Can you tell me about this? I have a new bastard 6G2 build that is AWESOME until I hit 10 on the volume pot. I have a big grid resistor on the PI. Sounds to me like blocking distortion in the pre-amp. If I turn the volume down to 8.5 - 9ish it's perfect. Above that I get some serious "compression" for lack of a better term. Bang a low E chord and it sounds OK but muddy/compressed. As the the chord decays the volume swells back up slightly.

Was considering adding a grid stopper to the second stage when I remembered this thread.

Thanks

EDIT: Added a 120k/470k voltage divider to the grid of the second stage (120k grid / 470k to ground) . Sounds/feels the same - maybe a tad darker (?) but this amp is pretty bright so nothing that can't be fixed with a slight twist of the tone control. Mud/compression is gone. Sounds awesome!

Still interested in your "resistor from wiper to ground" fix.

[Smokebreak]

Yea man, I'm not sure what value I used, but a resistor from wiper to ground of the volume put just cuts the resistance to ground, decreasing the drive, in essence. It's usually done in higher gain amps to keep things tight but I guess it worked here too(it was a long time ago!!). You can stick a 1M trimmer in there and dial it in...