Blown rectifier in ValveKing 212

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Dragonaut
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Blown rectifier in ValveKing 212

Post by Dragonaut » Mon Apr 23, 2012 2:11 pm

Hey guys, first post here, but I'm not at all new to Peavey. But I'm I've got a bit of a problem with my old ValveKing 212. Whenever I power on my Valveking, I have the indicator lamp lit, but have absolutely no sound. Not even any hum on any volume levels. I've checked the tubes, the fuse, the transformers don't appear to be blown and I've even replaced the speakers with another pair I had as well as running the combo through a separate cab and still nothing.

I've done some research and from what I can find is that the lit indicator lamp with absolutely no sound is a symptom of a blown, solid state rectifier. Could this be the case? If not, what might it be?
Amps:
JSX 120W Head
ValveKing 212
Cabs:
Windsor 412 w/Eminence Man-O-Wars.

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Enzo
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Re: Blown rectifier in ValveKing 212

Post by Enzo » Mon Apr 23, 2012 3:20 pm

REally? If you had a bad rectifier, you'd probably have a blown fuse. Have you checked all the internal fuses?

Before going inside, you could even pull a power tube and probe the socket with your meter. Do you get +450v or so on pins 3 and 4? And maybe -50 on pin 5?

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GennyFan
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Re: Blown rectifier in ValveKing 212

Post by GennyFan » Mon Apr 23, 2012 3:59 pm

Enzo wrote:...Before going inside, you could even pull a power tube and probe the socket with your meter. Do you get +450v or so on pins 3 and 4? And maybe -50 on pin 5?
And if you don't know what Enzo is talking about, that's a good indication that it's time to hire a competent tech. :wink:

Welcome to the forum!

Dragonaut
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Re: Blown rectifier in ValveKing 212

Post by Dragonaut » Mon Apr 23, 2012 4:28 pm

Thanks guys! I'll bust out my meter and take a look. I'm used to working with amps for the past 4 or 5 years so I know my way around the things. Just never had this type of problem occur before. I'll post the results when I get them. :)
Amps:
JSX 120W Head
ValveKing 212
Cabs:
Windsor 412 w/Eminence Man-O-Wars.

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65 SG
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Re: Blown rectifier in ValveKing 212

Post by 65 SG » Mon Apr 23, 2012 4:58 pm

Note that the pilot light on a VK only requires the low voltage rectifier bridge to be good and is NOT an indication that either the B+ or heater supplies are present.

F201 (the internal B+ fuse) can blow without taking out the AC mains fuse so yes it could be a diode in the HV bridge. Do Enzo's test...

It could also be an open tube heater or bad tube socket/solder joint. You said its not tubes but is this based on swapping in good ones, looking at the old ones, or ? Check all the tubes for filament glow and if tubes don't glow but are OK in another amp, check to see if the channel switching works; if not, R213 is probably open (which affects both heater supply and +14V to the relays) or has developed a bad solder joint.
'03 SG Special, '08 LP Special DC, '60s Dano/Silvertone, Epi Moderne, Epi EB-0, '60s Telestar semi-hollow,
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Dragonaut
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Re: Blown rectifier in ValveKing 212

Post by Dragonaut » Mon Apr 23, 2012 9:36 pm

Thanks for all of the helps guys. I ran Enzo's test and everything's reading good. The solder connection on the tube sockets are good too. The R213 has good connections and the B+ fuse is definitely blown. Now I just have to get it out of the pain in the a** holder.
Amps:
JSX 120W Head
ValveKing 212
Cabs:
Windsor 412 w/Eminence Man-O-Wars.

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Enzo
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Re: Blown rectifier in ValveKing 212

Post by Enzo » Tue Apr 24, 2012 2:30 am

Does the fuse LOOK like there is a wire coming out each end? If so, that is not a holder, that is a fuse with its own wires. In the trade we call those pigtail fuses. It is soldered into place then.

You can either get a new pigtail fuse, or get one of those inline fuse holders with wires, and solder it to the board, then clip a fuse into it. The sort of fuse holder in the middle of the wire on the back of a car radio.

If the B+ fuse is blown, it usually means a power tube failed.

Dragonaut
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Re: Blown rectifier in ValveKing 212

Post by Dragonaut » Tue Apr 24, 2012 10:07 am

Well that would explain why I couldn't get the fuse out at first. I'll de-solder it out and get a new pigtail fuse in there ASAP.

Update: Just got the fuse in and its all fixed. Through a different pair of 6L6's in for good measure and I'm back up and running. Thanks for all of the help! :D
Amps:
JSX 120W Head
ValveKing 212
Cabs:
Windsor 412 w/Eminence Man-O-Wars.

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CharlieP
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Re: Blown rectifier in ValveKing 212

Post by CharlieP » Wed Apr 25, 2012 4:10 pm

Rock On! :)
Charlie
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