#1
Well I bought a used Peavey 6505+ 112 combo about 3 weeks ago. It was a big upgrade in tone over my Vypyr tube 60. I thought I had that tube tone with the Vypyr, but as soon as I plugged into the 6505+ the day I got it I was blown away.

Problem is, the 6505+ has been losing its tone for the last week. I'm just not hearing the fullness of the tube sound that I was hearing when I picked it up. This morning I plugged into it and it sounded like the plexi model on my Vypyr, not much gain and a lot quieter. This was a used amp, so I really have no idea how old the tubes are. I'm assuming I need new tubes.

I've been playing the lead channel with the pre gain almost maxed out since I got it. I'm not sure if I just drove the old tubes into the ground or what. Should I be conservative with the pre gain in the future? Will I go through tubes every month if I play with it dimed?

Also as far as a tube change goes, I hear a lot of people on this forum recommending JJ tubes and the website eurotubes.com. I'm reluctant to go to my Sam Ashe, which is my local music store, because I seem to get a lot of advice from the sales people there that is in direct opposition to the general consensus I get on these forums. Not to mention the price.

Here's what I need to know: Can I change the tubes myself? Does this amp have to be biased? If I can change the tubes myself and the amp does not have to be biased, can anyone recommend a tube set and a vendor with good prices?

By the way I play mostly metal and punk rock.
#2
You can change the tubes yourself. If you bought it used it might be a good ideas to replace all the tubes. Find the bad one by swapping one at a time and toss it. Keep the rest as spares.

It sounds like just a bad preamp tubes.
Quote by DeathByDestroyr
See, it's important that people clarify when they say "metal", because I pretty much always assume they are a Cannibal Corpse fanboi.
#3
I agree it is probably a pre-amp tube. JJ are decent, I also like the new Mullard 12ax7.

www.tubedepot.com
www.dougstubes.com
www.eurotubes.com
www.thetubestore.com
all good sites to order from.
You can get the rubytubes 12ax7 from www.musiciansfriend.com and it is really a JJEcc83 and they are cheap
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#4
Here's a video on youtube of a dude running through a few different tube brands on his 6505+. It's not a combo, rather the head unit, but you'll get a good idea.

To my ears the tone differences are slight, but they're there. Pick a tube based off that comparison.

http://www.youtube.com/watch?v=yWU31KLo5Uw
#5
That's very odd, to me the Tube Vypyr 60 sounds more like an actual 6505 than the 1x12 Chinese combo does.


But yeah, it's most likely a preamp tube going out. Buy a set of replacements, swap them out one at a time until you find the bad one, and toss it specifically. Hang onto the rest as spares as the other UG'er recommended.

EDIT: There is no reason to ever max out the gain on a 6505. They have a shit ton available as is. Noon is more than plenty for 95% of applications on that amp
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[thread="1166208"]Gibsons Historic Designs[/thread]
Last edited by Flux'D at Apr 12, 2013,
#6
Quote by Flux'D
That's very odd, to me the Tube Vypyr 60 sounds more like an actual 6505 than the 1x12 Chinese combo does.


But yeah, it's most likely a preamp tube going out. Buy a set of replacements, swap them out one at a time until you find the bad one, and toss it specifically. Hang onto the rest as spares as the other UG'er recommended.

EDIT: There is no reason to ever max out the gain on a 6505. They have a shit ton available as is. Noon is more than plenty for 95% of applications on that amp


Hmm... I've found the chinese 6505+ combo quite easy to dial in, getting the same sound and feel I have running through older 5150s.

The Vypyr 60 comes close, but it's almost too growly and doesn't quite buzz the same. It sounds like an amp emulating the 6505.

Anyways, it's subjective.

As for gain, you can say that again, anything above maybe 6 or 7 yields little positive return.
#7
^ agree with the gain, set it around 6 max and you have better tone and longer pre tube life
#8
The resulting life span of a preamp tube based on gain alone is going to be negligible at best. Sure it will make a difference, but not by enough to really keep you from feeling comfortable cranking the settings.
#9
Go to Eurotubes and buy a 6505 plug n play set, the guy there specialises in 5150s and has done for years, his prices are great so it doesn't get much easier.

I've always used JJ, and every amp I've bought (aside from my 5150 years ago, which I revalved right away) came with JJ, so I can't really have any opinion otherwise but they certaintly do the job.
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#10
Quote by Bigbazz
Go to Eurotubes and buy a 6505 plug n play set, the guy there specialises in 5150s and has done for years, his prices are great so it doesn't get much easier.

I've always used JJ, and every amp I've bought (aside from my 5150 years ago, which I revalved right away) came with JJ, so I can't really have any opinion otherwise but they certaintly do the job.
The only thing Eurotubes deals in is JJ's. So of course a plug and play set from there is going to be nothing but JJ's
Endorsed by Dean Guitars 07-10
2003 Gibson Flying V w/ Moon Inlay
2006 Fender All-American Partscaster
SVK ELP-C500 Custom

1964 Fender Vibro Champ
1989 Peavey VTM60

[thread="1166208"]Gibsons Historic Designs[/thread]
#11
Thanks for the replys. Since I have four days off this weekend I didn't want to wait for an internet order to ship, so I went to guitar center and payed the extra 25 or so bucks for a set of tubes. They didn't have JJ's in stock, they said they'd have to order them and it would be a few business days. They did have Mesa tubes in stock. I told the manager I was recommended JJ's and asked what the difference was. He said that there is only a few tube manufacturers in Russia and that Mesa buys a crapload of tubes from them, tests em and keeps the best ones. They then apparently sell the other tubes to companies like JJ and Groove Tubes. So I asked him if that meant that Mesa's are better than JJ's, and he said yes, pretty much.

Don't know if his story was correct or not but I installed them and the amp sounds great again. I was too lazy to try to find the bad tube in the old set so I just saved all the old ones.

On a side note, I found out what the problem with my Vypyr Tube 60 was. I was getting a real fizzy sound out of the all the high gain models like the 6505 and Recto. When I changed the tubes in my 6505+ I had to unplug my Vypyr because it was on top of it. I plugged it in after I was done without the Sandpera 1 footpedal, just to compare the two amps. No more fizzy crappy sounding Vypyr, it sounds great again. I would have never thought that the problem was the footpedal, and I was about to start trying all the old tubes I just yanked to see if I could fix that one too.

So fixed both my amps. I wonder whats going on with the Sanpera 1, anyone have any experience with this issue?
Last edited by Surf1975 at Apr 12, 2013,
#12
That's a load of bollocks. JJ are made in Slovakia using old equipment bought from Tesla. Groove Tubes rebadge all sorts of things, some are Russian, some are Chinese, some are Slovakian. It is true that there are only two factories in Russia but they certainly don't supply all tubes to the world.

Retube it with JJ's. Chances are that you've just worn out one preamp tube.
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#13
Quote by Surf1975
Thanks for the replys. Since I have four days off this weekend I didn't want to wait for an internet order to ship, so I went to guitar center and payed the extra 25 or so bucks for a set of tubes. They didn't have JJ's in stock, they said they'd have to order them and it would be a few business days. They did have Mesa tubes in stock. I told the manager I was recommended JJ's and asked what the difference was. He said that there is only a few tube manufacturers in Russia and that Mesa buys a crapload of tubes from them, tests em and keeps the best ones. They then apparently sell the other tubes to companies like JJ and Groove Tubes. So I asked him if that meant that Mesa's are better than JJ's, and he said yes, pretty much.

Don't know if his story was correct or not but I installed them and the amp sounds great again. I was too lazy to try to find the bad tube in the old set so I just saved all the old ones.

On a side note, I found out what the problem with my Vypyr Tube 60 was. I was getting a real fizzy sound out of the all the high gain models like the 6505 and Recto. When I changed the tubes in my 6505+ I had to unplug my Vypyr because it was on top of it. I plugged it in after I was done without the Sandpera 1 footpedal, just to compare the two amps. No more fizzy crappy sounding Vypyr, it sounds great again. I would have never thought that the problem was the footpedal, and I was about to start trying all the old tubes I just yanked to see if I could fix that one too.

So fixed both my amps. I wonder whats going on with the Sanpera 1, anyone have any experience with this issue?


There's a good life lesson to be learned in all this...don't take advice from anyone at Guitar Center, to include the manager. Especially the manager. Wow...
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#14
I figured that was the story was BS, but I figured Mesa tubes cant be bad, and I didn't want to wait. The sound great, I just had to pay about 25 bucks more to satisfy my need for instant gratification. But yeah, I tend to get crap advice from guitar center and sam ash. The dude at sam ash told me that all tubes sound the same.
#15
Quote by Surf1975
I figured that was the story was BS, but I figured Mesa tubes cant be bad, and I didn't want to wait. The sound great, I just had to pay about 25 bucks more to satisfy my need for instant gratification. But yeah, I tend to get crap advice from guitar center and sam ash. The dude at sam ash told me that all tubes sound the same.


I just picked up a used 6505 and it had mesas in it. The ones in my amp are JJ's. I compared them side by side.


So your 6505 is fixed?

And you also fixed your Vypyr as a bonus?

Quote by DeathByDestroyr
See, it's important that people clarify when they say "metal", because I pretty much always assume they are a Cannibal Corpse fanboi.
#16
JJ make their own in the factory in Slovakia, Mesa/Marshall/Groove Tubes etc are rebranded Russian valves such as Sovteks, Electro Harmonix too (though I believe they own Sovtek).

Mesa sell their valves as matched pairs, usually overpriced (atleast in this country) but they allow you to plug and play without needing to rebias in their Mesa amps (since they will be the same rating as the previous valves in the amp).

With the 6505 though, unless something has changed since the 5150 it does not "need" to be biased, infact you can't bias it without a mod.
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