Tube Amp Archive

4AR5? maybe 5AR4? Does it feel good to correct someone for a obvious and unimportant typo? I hope your day was a little better. wow! I guess spelling, grammar and logistics have no place on this forum...... cheers, [/quote] It's not black and white like that. Ask yourself, does it need to be correc...

Any chance of getting the voltages measured? IT WAS THE HARNESS!!! Getting -51 at pins Happened to have order this guy from temu a while ago, works much better than the smaller ones and got rid of the makeshift plastic housing I needed to make it work prior! https://i.ibb.co/mrGTnPgp/580005c3-760d-...

Guessing its the harnesses. Basically rebuilding it. Had to try the non-audio switches ......

(1) Set up the transformer chassis the way that you get that healthy -71V of bias voltage. Measure and WRITE DOWN: > the bias voltage, presumably still -71V > the DC voltage on the first filter capacitor >>> the AC line voltage across the transformer primary wires (2) Turn off the AC mains and drai...

(1) Set up the transformer chassis the way that you get that healthy -71V of bias voltage. Measure and WRITE DOWN: > the bias voltage, presumably still -71V > the DC voltage on the first filter capacitor >>> the AC line voltage across the transformer primary wires (2) Turn off the AC mains and drai...

If the issue is important enough to ask in a forum, it's important enough to remember to check the forum periodically, I think. Edit: I forgot - how's that voltage testing going? :D I apologized, I was under the impression that I would be emailed when there were replies. Currently I am rebuilding t...

Just a bump for the previous responses, again I did not know people were replying I now have e-mail notifications turned on.

So as far as mods, the bias circuit is housed in the PT chassis. I did use a XLR to connect it to the main chassis when it worked. Got rid of that now, will use something simpler if and when I can figure out the drop. Outside of that, the PT is no longer in series with another since the new Hammond ...

AGAIN I AM SO SORRY I DID NOT REALIZE THERE WERE RESPONSES! Ive seen bad output tubes cause that before. Also, leaky coupling caps can cause a large DC discrepancy in the bias supply, but you probably wouldn’t need to install the tubes to see it I replaced the caps, I am measuring pin 5 of the 6L6 ...

Oh I did not get any e-mails regarding replies! I am so sorry to everyone who botherd!

Hello again my helpful friends. So I built a Hoffman Bassman, mine is Bassedman. Had it working, got the tubes right as I was tailoring it for bass. Used a hammond organ in series with another for the proper HT, was feeling myself. Got confident added a LFB on a single valve, found input jacks that ...