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Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sat 04/01/23 9:11 am
by Martinoils
Hey guys, really would appreciate some help with this one. I have hit a wall. No sound from the TMB/ master volume channel.
Here are some photos and voltage readings I have rewired the input jacks carefully looking for shorts, mistakes etc. when prodding with a chopstick I do get a crackle on c6.
I’ve built five amps so far as a beginner just beginning to understand simple schematics.
Much thanks in advance for any help.

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sat 04/01/23 9:50 am
by Bieworm
Take your DMM and look for shorts testing resistance to ground at plates and grids

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sat 04/01/23 10:26 am
by Martinoils
Thanks! I’ll give it a try

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sat 04/01/23 11:15 am
by Martinoils
I’m sorry, can you explain how to do that? I’m not sure I’m doing it right and what to look for, can I do it with the power off?
Thanks again

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sat 04/01/23 2:34 pm
by chaliapin
While you're waiting for the experts... yes, power off.

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sat 04/01/23 4:53 pm
by Martinoils
Thanks

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sun 04/02/23 3:11 am
by Bieworm
With the DMM set on ohms:
red probe to pin 2 or/and 7 and black probe to ground
Red probe after each coupling cap and black probe to ground
When you get zero ohms there is a short in that part

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Sun 04/02/23 11:02 pm
by Martinoils
Thanks Bieworm
I’ll give it a try!
The 001uf coupling capacitor at position C6 does make some noise when tapped with a chopstick, I took it out and checked the capacitance and it was ok, I soldered it back in but no change still makes noise

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Mon 04/03/23 5:35 pm
by Martinoils
Found a short and it sounds great! Thanks!

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Tue 04/04/23 6:23 am
by Jon_Kayak
Bravo!

Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Posted: Tue 04/04/23 7:56 am
by Martinoils
Thanks!