Tube Amp Archive

Doesn't the low voltage leg create a lot of noise ? Wouldn't you want as little 6.3 volt wiring in your chassis as possible ? LED's are typically 12 volts .. there probably just as bad ?

Is there a reason the lamp is in the heater circuit ? I understand that you know for sure the secondaries are working when it's on that side. Does putting it on the 120V side have any negative affects ?

https://tubeamparchive.com/viewtopic.php?t=7191

I have another thread "ANYBODY UP ??" In the technical discussion area with pics. I don't know if the link will work. That is what it DID look like. It's totally stripped now. I will post step by step pics as I go. Thanks again for all the support.

Hammond 272BX


That's what it is.....

Does anybody have one of these for sale or a reliable source to get one ?
Thanks...

:cry: :cry: :cry: :cry: :cry: :cry: O.K. ..... I made a suicide cord. I took all the precautions. I wire nutted my meter leads to the transformer. I measured red to red out of the transformer and got 337 V AC. I measured one red to red/yellow and got 142 V. I measured the other red to red/yellow and...

Yeah... I think. It's a hammod 25?-x I think. I'm not sure off the top of my head. I bought it from RJ. I'm going to try the hardwire thing tonight. wish me luck. I will be safe.

I pulled the tranny out completely and ohm-ed out all the windings.
I got ...

4.6 ohms black to black
1.2 ohms green to green
1.0 ohms yellow to yellow
101 ohms red to red
64.7 ohms red1 to red/yellow
38.5 ohms red2 to red/yellow

What gives ?

With the yellows and greens capped I measured AC voltage across the two reds with the red/yellow GROUNDED... and got about 360V for about 10 seconds and then blew a fuse. I'm going to try to get a Ground fault checker and check my outlets. This is with only the switch, fuse and transformer in the ch...

I know I need to do more research on star grounding but can somebody explain the purpose ? I just watched the youtube video somebody linked about noise reduction, shielding, and grounding. It was very informative. I'm glad I'm re-doing this... It's so much clearer the second time around. The colors ...

Yes..... That's a good idea. Since it was my first I guess I shouldn't be too discouraged. I know the reward of flipping the switch and getting that thing to sing will be worth it. It seemed liked a long process to get this far... but looking at it now... it seems a lot easier after just going throu...

Keep in mind this is my first attempt at a tube amp. I had it all together and plugged in, all the tubes were glowing.... the volume knob seemed to have no effect on the output.... I got a little sound out of the speaker if I touched the end of the guitar cable. . I had no sound when I actually plug...

Everything checks out with the meter but I am still blowing fuses... hmm.

Is it possible(without harming anything) to wire up the power portion of my Champ without the board ? I understand that the red and yellow wires will still be hot so they'll need to be capped but should there be a load on them ? I guess I just want to confirm that the heater circuit is working. Does...

It's my first and kind of a frankenstein. I have just one input jack and only one 100 ohm input resistor. It's a 4 ohm speaker... the resistance across the speaker is 3.6ohms. There are two lamps on top but only one is hooked up.. mistake. As far as the layout being backwards... that's probably just...

I've been working on my champ (first amp) for a month or so now on and off. I plugged it in for the first time a few minutes ago... NO SMOKE !!!!!!!! I get my lamp to light... the heaters glow pretty.... if I touch the end of the guitar cord against the guitar jack I can hear the speaker rustle a bi...