#1
Hi everyone, I hope this is the right place to post this.

Anyways, I recently bought a Peavey 6505+ 112 combo from a friend. The amp worked great, sounded great and I had no problems for about a month. One night I was jamming along with the volume maybe on 1.5 at most, so not that loud. After I was done playing I turned everything off as I normally do.

The next day I went to turn the amp on and nothing, just nothing. I tried changing outlets and that wasn't the problem. Lights don't turn on, and tubes don't glow at all. Could I have blown a fuse? I'm really confused. The fact that it worked fine the prior night and I know for a fact no one touched it or anything between the 24 hours when it did work to when it didn't, then magically stopped working. I'm an amateur when it comes to this stuff.

Any help or suggestions?
#2
Check the fuse. If it is blown and it blows again after replacing it, chances are that you need new power tubes.
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#3
Will do, I'll post again here and let you know if that works.
Last edited by thekronedog at Jun 24, 2016,
#5
HT fuse in the chassis likely.
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#6
If it was just the HT fuse, the lights would be on and the tubes would light up.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#7
Okay I just replaced the fuse, power came on when I turned amp on. All lights seem to be working correctly and tubes are glowing in the back.

But there is no sound coming from the amp, not even a buzz when I turn the volume up. Feeling a bit discouraged now, think it might be the tubes?
#9
Now it sounds like the HT fuse is also blown.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#10
Is this the 3x bad diodes on the board problem that goes around every so often?
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#11
It could be - but first things first. Start with checking the HT fuse.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#12
Quote by Cathbard
If it was just the HT fuse, the lights would be on and the tubes would light up.


good point. i was not thinking correctly.

(for my learning) couldn't multiple fuses go at the same time? say a mains and an HT being taken out together?
WTLT 2014 GG&A

Quote by andersondb7
alright "king of the guitar forum"


Quote by trashedlostfdup
nope i am "GOD of the guitar forum" i think that fits me better.


Quote by andersondb7
youre just being a jerk man.



****** NEW NEW NEW!
2017-07-07 2017-07-07 Update and a Chat On Noise Constraints *** NEW FRIDAY 7/7
2017-04-13 RUN AWAY from COMPUTERS!!! TCE? RANT ALERT!!!
2017-03-02 - Guitar Philosophy 1001- Be Prepared For the Situation (Thursday 2017-03-02)
2017-02-21 How to Hot-Rod the Hell of your Stratocaster for $50! (Tuesday 2017-2-21)
Resentments and Rambling from a Guitar Junkie
---> http://trashedengineering.blogspot.com/
#13
Quote by metalmingee
Is this the 3x bad diodes on the board problem that goes around every so often?


Possible, but the fact that it took out the mains fuse seems odd and inconsistent with how the diode issue normally manifests itself. I'm betting that an issue with tubes caused fuse failure.
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#14
thekronedog

Are the preamp tubes lighting/warming up? You may have to take their covers off to tell.
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#15
KailM

Yes, tubes are lighting up/glowing and they seem to look fine when the amp is turned on. I'm goin to check HT fuse when I get home later today.
#16
thekronedog

Okay good -- that doesn't sound like the rectifier bridge diodes then. Not that those are expensive to replace, it's just a major pain. Or expensive to pay someone else to do it. If it's not your HT fuse, the next thing I'd try is a new tube in V5 (the one closest to the power tubes, not in a row with the rest of them). That's your phase inverter tube, and if it's gone bad you won't get any sound out of the amp. Also keep in mind that just because a tube is lighting up, it doesn't necessarily mean it isn't dead. I highly recommend a JJ 5751 tube for that spot anyway. You may try plugging your guitar directly into the effects loop "return" (or is it the "send"???) jack and see if you get any sound. If so, it will be a clean sound only and will almost certainly mean your phase inverter tube is dead.
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#17
Thanks for all the help and suggestions guys, it's very much appreciated.

It's got to be a tube problem (probably) but I have not had much time to go in and check it out, probably going to bring the amp into someone who knows what they're doing and have them fix it. Thanks again!