Peavey Duel Two Twelve Classic Tube Series

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MrMurphy
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Peavey Duel Two Twelve Classic Tube Series

Post by MrMurphy » Mon Sep 25, 2017 3:36 pm

My Duel 212 classic is blowing the f2a 2amp fuse, I pull the 6L6s out, and the fuse stops blowing so I know I have a bad tube. But I was curious to know, there are 2 1 amp fuses, 1 2 amp fuse, and an 8 amp ceramic fuse. What are each of these fuse for? Thanks in advance.

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Enzo
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Re: Peavey Duel Two Twelve Classic Tube Series

Post by Enzo » Mon Sep 25, 2017 3:43 pm

Look at the schematic:

The 2A fuse is for the high voltage, which is what your bad tube is shorting out.

The two 1A fuses are for the low voltage supplies, +25v and -25v.

The 8A fuse is for the tube heaters.


On the power tube board, there are four 100 ohm 5 watt resistors. MAke sure none of them have gone open. Bad tubes often take out screen resistors, which those are.

ScottMarlowe
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Re: Peavey Duel Two Twelve Classic Tube Series

Post by ScottMarlowe » Mon Sep 25, 2017 4:00 pm

I'm pretty sure you'd blow the HT fuse if you lost bias as well. Pin 5 on the 6L6 sockets should have a negative voltage of about -20V or so on it. If you're familiar with tube amps and high voltage hand it off to a tech. In fact check for proper voltages all around.

MrMurphy
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Re: Peavey Duel Two Twelve Classic Tube Series

Post by MrMurphy » Mon Sep 25, 2017 6:55 pm

Where can I find a schematic for this amp?

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Enzo
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Re: Peavey Duel Two Twelve Classic Tube Series

Post by Enzo » Mon Sep 25, 2017 7:43 pm

Call customer service at Peavey and ask for it.


Actually pin 5 bias voltage ought to be more like -55 to -60 volts. 20 volts would be more like an EL84 amp.

MrMurphy
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Re: Peavey Duel Two Twelve Classic Tube Series

Post by MrMurphy » Mon Sep 25, 2017 8:53 pm

Correct, this amp came with 6L6 tubes.

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