Tube Amp Archive

Thanks for the advice guys. I passed and will keep my eyes out for something better.

He's asking $50. He claims it works.

I'm looking for an oscilloscope. Does anyone know if an HP 1201A is any good?

It happens with the chassis out of the combo. I have tried a different speaker cab as well and it still does it.

I will check the wiring to the jacks, thanks for the suggestion.

Combo.

That's not me, but my amp is the same.

I'm pretty sure the problem is in the phase inverter. I measured 100VDC on the grids of the PI. Does that sound right? Also, there is 125VDC on the cathode of the PI, but it should be 105V according to the schematic. I'm not sure why it is off. The bias resistor measures 470ohms like shown on the sc...

Unfortunately I don't have an oscilloscope. I did measure the voltages. On channel 2, I don't know what the voltages should be, and I couldn't access the last stage without taking the board out. The first number is what I measured, and the number in parenthesis is from the schematic: V1A (Preamp Ch....

I doubt if the dented PT is the problem. But take the end bell off and see if what is any damage was done the the core. Have you tried different speakers ? Not being familiar with the slant six, is it a cathodyne PI ? is a 6v6 pr output tube ? did it do this before the redplate mods ? I did try a d...

Hi, Newbie here. I am having trouble with my Carr Slant 6 (modded by Red Plate amps) and was hoping for some assistance. If I turn the clean channel up past noon, I get this buzzy distortion that phases in and out after the initial pick attack. It only happens on the wound strings. I thought it was ...