Strange problem with new build

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Vegard
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Strange problem with new build

Post by Vegard » Mon Jul 12, 2010 7:26 pm

Ive just finnished my third 12000 series, but I have some problems with this one.
I cant get any sound out of it! When I crank the volumes to 10 i can hear the guitar, but its very very quiet.

All voltages are fine on the pins!

So far I have:

Double checked wiring
Re-flowed turrets
Tried different tubes
Compared wiring to my other 12000 amp
470Ohm resistor is also correct
Metroamp builds : 68` 50w (x2), 69` 100w, 68` 100w 12xxx (x3), JTM45/100, JTM50(x2), 2203

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vanhalen5150
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Re: Strange problem with new build

Post by vanhalen5150 » Tue Jul 13, 2010 5:34 am

Check cables and input speaker jacks with another amp. Recheck your OT wires.
12000 Metro Kit

vh junkie
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Re: Strange problem with new build

Post by vh junkie » Tue Jul 13, 2010 12:07 pm

Make sure pins 4 & 5 (red heater wires) of v1-v3 are jumpered at the sockets... post pics...
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VelvetGeorge
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Re: Strange problem with new build

Post by VelvetGeorge » Tue Jul 13, 2010 1:16 pm

Do you hear a sound when you touch plate terminals with your meter?

Start at the output tubes and work your way backwards through the amp until you don't hear a sound when you touch your meter lead to the plates.

george
Check out Plexi Replicas for my personal amp builds...
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Vegard
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Re: Strange problem with new build

Post by Vegard » Tue Jul 13, 2010 1:41 pm

Thanks for help :)

I hear a sound when i touch the plate terminals with my meter. I am at work now, but if I remember correctly the "sound" stops at V1. I have also tried tubes that I know works.
Metroamp builds : 68` 50w (x2), 69` 100w, 68` 100w 12xxx (x3), JTM45/100, JTM50(x2), 2203

Vegard
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Re: Strange problem with new build

Post by Vegard » Tue Jul 13, 2010 6:39 pm

I fixed it! The 100k resistor on the pins in V2 was installed wrong : )
Metroamp builds : 68` 50w (x2), 69` 100w, 68` 100w 12xxx (x3), JTM45/100, JTM50(x2), 2203

robert
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Re: Strange problem with new build

Post by robert » Wed Jul 14, 2010 2:14 pm

Good ol' Larry, I hear you... :wink:

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