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

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

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

Post by Bieworm »

Take your DMM and look for shorts testing resistance to ground at plates and grids
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"THIS should be played at high volume..preferably in a residential area"

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

Post by Martinoils »

Thanks! I’ll give it a try
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Martinoils
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Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

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

Post by chaliapin »

While you're waiting for the experts... yes, power off.
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Martinoils
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Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Post by Martinoils »

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

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

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

Post by Martinoils »

Found a short and it sounds great! Thanks!
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Jon_Kayak
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Re: Help,New Valvestorm 18w TMB build, no sound on the Tmb channel

Post by Jon_Kayak »

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

Post by Martinoils »

Thanks!
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