VK112 stoped working

This forum is for talking about all kinds of Peavey guitar amplifiers.
Post Reply
bharley
Member
Posts: 30
Joined: Tue Mar 29, 2011 3:50 pm

VK112 stoped working

Post by bharley » Tue May 17, 2011 7:32 pm

I was playing my Valveking 112, then a pop sound and no volume. Lights on, fuse is fine, tubes don't look out of the ordinary, replaced em all with spares, but when I try to play the guitar nothing, high or low gain input. I think the speaker is fine because when I cut the gain all the way up and hit the boost I still hear that normal faint hum. Any ideas what it might be, I have the warranty and will give peavey a call tomorrow.
Carvin Bolt T hss
Ibanez SZR520
Peavey Valveking 112
Peavey Vypyr 60 Tube w/SII

Classic30inCincy
Member
Posts: 31315
Joined: Fri Sep 12, 2008 3:10 pm
Location: The Mountain Retreat [Cincinnati Ohio]

Re: VK112 stoped working

Post by Classic30inCincy » Tue May 17, 2011 7:36 pm

Additional fuses on circuit board......

PAF Classic Series Tube Kit.......Created By Classic30inCincy
Majic Mojo Tradename..........Created By Classic30inCincy
Graduate Of Joe Friday / Dragnet School Of Correspondence
Doctorate Degree Diplomacy From Royal Order Possum Lodge

bharley
Member
Posts: 30
Joined: Tue Mar 29, 2011 3:50 pm

Re: VK112 stoped working

Post by bharley » Tue May 17, 2011 7:45 pm

Yeah I should have know it wouldn't be an easy fix, and to open that up would void the warranty wouldn't it.
Carvin Bolt T hss
Ibanez SZR520
Peavey Valveking 112
Peavey Vypyr 60 Tube w/SII

bharley
Member
Posts: 30
Joined: Tue Mar 29, 2011 3:50 pm

Re: VK112 stoped working

Post by bharley » Tue May 17, 2011 8:38 pm

Messed around with it a little more, I can get a faint sound with volume, gain, high gain input, volume boost, and boost on. That should get the neighbors calling but I can hardly hear it. I took the amp out to ohm out the fuses, only saw three that were visable, and they all ohmed out fine, put it back together and I'm going to be calling peavey as soon as the lines are open in the morning.
Carvin Bolt T hss
Ibanez SZR520
Peavey Valveking 112
Peavey Vypyr 60 Tube w/SII

User avatar
jethro rocker
Member
Posts: 171
Joined: Thu Jan 22, 2009 11:12 pm

Re: VK112 stoped working

Post by jethro rocker » Tue May 17, 2011 9:13 pm

Make sure the input to the reverb tank are plugged in solid, too...

User avatar
65 SG
Member
Posts: 1060
Joined: Wed Jan 06, 2010 9:35 pm
Location: Chicago, Blues Capitol of the World

Re: VK112 stoped working

Post by 65 SG » Tue May 17, 2011 9:33 pm

I'd mostly suspect a cracked / bad / cold solder joint. Visually inspecting the board will usually find these - but first try to narrow it down...

Use the FX loop to test if the preamp and power amp sections work as follows;
Plug FX Send into another amp's input, plug your guitar into the VK and see if the preamp works
Plug an MP3 player, mixing board, or guitar into a distortion/boost pedal cranked way up into the FX Return to see if the PA section works

Also, check the connector to the output transformer, that's been known to get corroded and noisy (but it's a long shot)

Bad power supply diodes have occurred too but "usually" they short and take out a fuse.

Make sure all the tube filaments are glowing, even if you replaced them all there could be a clue if some or all are not. Turning off the room lights will help, some 12AX7s are very dim

It might also be the channel switching mute triac and/or FET but if it's under warranty let a Peavey shop dig in for that. If the PA section works and the preamp section is extremely feeble, this is a possibility...
'03 SG Special, '08 LP Special DC, '60s Dano/Silvertone, Epi Moderne, Epi EB-0, '60s Telestar semi-hollow,
Classic 20 w/6V6 mod, much modded VK112, Windsor Studio combo, Transtube Envoy II, '61 Reverberocket

Fourtythree
Member
Posts: 296
Joined: Wed Jan 21, 2009 3:09 pm
Location: WV

Re: VK112 stoped working

Post by Fourtythree » Tue May 17, 2011 10:16 pm

Weak solder joint around the input jacks seem to be a recurring theme with the VK. If you still have a warranty, definitely use it.
VK212-head conversion, modded
Ultra 410
Vypyr VIP 1

bharley
Member
Posts: 30
Joined: Tue Mar 29, 2011 3:50 pm

Re: VK112 stoped working

Post by bharley » Wed May 18, 2011 8:00 pm

My local music store is awesome, I called them and told them the problem, and they are going to switch me out with a new one, so problem solved. :D
Carvin Bolt T hss
Ibanez SZR520
Peavey Valveking 112
Peavey Vypyr 60 Tube w/SII

Classic30inCincy
Member
Posts: 31315
Joined: Fri Sep 12, 2008 3:10 pm
Location: The Mountain Retreat [Cincinnati Ohio]

Re: VK112 stoped working

Post by Classic30inCincy » Wed May 18, 2011 10:13 pm

Dealer DESERVES a Big Atta-Boy :!: :idea: :!:

Post name of Dealer along with location (City & State) so they get attention for.......

"Job Well Done"

Thank You Friendly Local Peavey Dealer

PAF Classic Series Tube Kit.......Created By Classic30inCincy
Majic Mojo Tradename..........Created By Classic30inCincy
Graduate Of Joe Friday / Dragnet School Of Correspondence
Doctorate Degree Diplomacy From Royal Order Possum Lodge

bharley
Member
Posts: 30
Joined: Tue Mar 29, 2011 3:50 pm

Re: VK112 stoped working

Post by bharley » Thu May 19, 2011 7:10 am

Center Stage Music
Augusta, GA
Carvin Bolt T hss
Ibanez SZR520
Peavey Valveking 112
Peavey Vypyr 60 Tube w/SII

bharley
Member
Posts: 30
Joined: Tue Mar 29, 2011 3:50 pm

Re: VK112 stoped working

Post by bharley » Fri May 20, 2011 12:55 pm

I'm up and running again, took a closer look before we made the exchange, did some of what 65 SG suggested, think it was probably the solder point on the input jack or something along those lines. But whatever it was is history now hopefully this one was put together a little more solid and I get plenty of years out of it. Guy at the store said some of these things are built like bricks, one of his band members dropped his down a flight of stairs and it came out without a scratch.
Carvin Bolt T hss
Ibanez SZR520
Peavey Valveking 112
Peavey Vypyr 60 Tube w/SII

Post Reply