Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: evancorylevine on August 06, 2017, 07:31:44 pm
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Good evening, y'all!
I just built a Weber AC30 and I had everything working great, but the chassis was super microphonic, so I moved some tubes around, got the microphonic stuff to go away, but now my tremolo isn't working. I get a clean signal that doesn't change between trem and vib. Sounds just like the normal channel.
Any idea what I should be doing? Should I be ordering new tubes? checking some of the other components?
Also, is it normal to get crackling and other sounds when adjusting the treble and bass? It doesn't sound like a dirty pot. It sounds like audio noise, or sometimes a bit of a thunk. I think the sound was cutting out altogether when treble was all the way down.
I eagerly look forward to your advice. You all have been so helpful. I am very grateful.
-e
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Tremolo circuit needs a strong tube.
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is it normal to get crackling and other sounds
um, no, crackling can be lots of things, bad soldering, bad socket, dirty stuff.........
other sounds, I'm thinking that's why we build :laugh:
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okay! crackling is basically gone.
when I pull the trem/vib pot to turn on the trem, there's a loud snap in the speaker. Any ideas?
Also, are there mods to increase the range of the speed and depth? I find that the speed could stand to be wider, and the depth could stand to be mellower.
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... are there mods to increase the range of the speed and depth? I find that the speed could stand to be wider, and the depth could stand to be mellower.
Yes. I replaced the depth preset pot with a front panel pot for complete user control of the depth. And I added a switched cap to extend the slow speed of the oscillator. You can see the mods on my schematic of the AC-15 which has the same trem/vib circuit as your Weber amp. Schematic at bottom of this page...
http://sluckeyamps.com/VAC15/ac15.htm (http://sluckeyamps.com/VAC15/ac15.htm)