Tube Amp Archive

This is what I ended up with, thanks again to everyone that helped me. I’m really pleased with the sound of the amp, it’s best through a cabinet that I have with 2 10” Celestion’s. I keep the long spring reverb in the speaker cabinet, that gives plenty of isolation so the amp is really quiet.

Where can a person order custom face plates for builds like this?

Exnilhilfit, I don’t have the software to make schematics. I took a schematic from a Princeton reverb and a champ amp and cut and pasted them together. So I can offer you this, which I started with. Once I started doing my eyelet board on graph paper, I found this thread. Telentube has a full layout...

Thank you lonote and thanks for your help. I was working with that today, I have the chassis on two by fours and I used some spacers and propped it up about an inch higher and put a 8AB2C1B short 3 spring tank under it toward the front with the output, facing away from the power transformer, and the...

Many thanks to Telentube who started this thread for his layout and everyone else who has helped me along the way. The amp is very quiet, and very happy with the reverb I did a few things different, since I wanted to fit this in a Vibro champ chassis I used a can capacitor instead of individual filt...

Thank you, Sluckey, I was looking at the tube data sheet wrong!

Thank you again for the input lonote. I apologize for my inexperience, but I have this nagging question that kept me up last night. If I put a 1M pot in to replace the grid resistor of the 12AT7 to create a dwell control, is it OK when there is zero resistance it would become a short to ground? Shou...

Thank you lonote, ...the schematic helps me understand where the 500 pF capacitor goes. I noticed that the OP has no screen resistor or grid stopper on the 6V6, I am learning, Reading other posts and understanding what these do, makes me feel like it might be a good idea to add them on this build. T...

Ok thank you, so just replace the resistor with a one meg pot, does it matter if it’s linear or audio on the potentiometer.? Ground one leg of the potentiometer, and the lead goes to the center tap?
I guess the 500 pf cap stays where it’s at.

Reverb transformer voltage? For the Princeton reverb circuit they are hitting it at +240 V, it appears that the OP is hitting it at +360 V. A twin reverb hits it at +400 V. So if I hit somewhere in this voltage range, it should be OK for the reverb transformer? Higher voltage stronger reverb? thx

Thank you, that does answer my question and I did not know about having no more than two gain stages per filter node. That makes sense, I have some electronic background, but not much experience building these amps. Having a lot of fun learning, I will be paying attention a little bit more when look...

Telentubes, nice build thank you for the info. I am new at this, so forgive my ignorance concerning these questions. I see where you added the 250 ohm 5 W dropping resistor for your fourth filtering stage. Just curious why you did this. It seems like you dropped 7 volts, and hitting the reverb trans...

Really like what you’ve done here, I am working on a similar project. I want to build mine as a head unit also. was curious about the cabinet and how close the reverb can be to the chassis. What is the height of your cabinet? Also, did you add the choke or the resistor for the fourth filter cap? Thx