joer526
Registered User
Join date: Jan 2011
30 IQ
#1
I recently picked up an Epiphone Galaxie 25 all tube amp. It is my first tube amp so I don't really know much about how they perform. It was a great deal and I bought it after only hearing it played clean. It only has a clean channel, no gain knob at all. When I turned it on at home, I heard the same great clean sound I had heard before. The possible trouble was when I kicked on the distortion pedal. The sound kind of hesitated and sputtered as if the tubes couldn't handle the drive from the pedal right away. I kicked it off and the great clean came back. I didn't get to do any more with it as my wife came home and you know what that means.

Yesterday I did some more experimenting and it seemed to perform better. Great cleans, raging distortion and OD, but the trouble was present again sometimes when kicking on the OD pedal quickly. The amp doesn't immediately respond. Is this in any way normal? I figured the problem the other night was that it wasn't warmed up enough as I had just brought it in from a freezing cold 20 minute ride home and turned it on 10 minutes later.

Any thoughts or ideas are appreciated. I have a little time to decide if I'm going to keep it or not. Thanks.
ProphetToJables
Tight Tight Tight
Join date: Dec 2008
150 IQ
#2
I would assume the problem lies with the pedal, not the amp.
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Gibson 2005 Les Paul Standard
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joer526
Registered User
Join date: Jan 2011
30 IQ
#3
The pedal works just fine thorough other amps. It also works fine through this amp if I kick it on and don't expect immediate results.
Dave_Mc
Chirp and Swirl
Join date: Mar 2005
440 IQ
#4
Quote by joer526
Is this in any way normal?


Nope. Or at least, not with any tube amps I've tried (I haven't tried yours).
Quote by crownegamers
I saw in a couple of pictures that on Bucketheads Les Paul (only some pictures) that his neck pickup is painted in white. Can anyone explain to me why he would do this, and if there are any pros and cons.

Quote by dspellman
The guy wears a KFC Bucket and a white mask during performances, and you're interested in the color of his pickup covers?

joer526
Registered User
Join date: Jan 2011
30 IQ
#8
So when I got home from work tonight, I pulled all the tubes to inspect them and reseated them. I noticed on one of the power tubes what looked like a burn spot. Is this normal or could it be an indication that it is bad or is going bad?

Also, the tubes are mounted in two sets of 3. I know it has 2 EL84 power tubes, 3 12AX7 preamp tubes, and 1 12AT7 tube for the reverb. I expected to see all 3 preamp tubes together, and the power and reverb tubes together. This was not the case. there was a 12AX7 with the power tubes and the 12AT7 was on the other side with the other two 12AX7s. Does this seem right? I can't find any information on what tube goes where.
Cathbard
Grumpy Old Tech
Join date: Oct 2009
240 IQ
#9
You should have spares anyway. If you had you could have tested them by now.
The 12AX7 near the power tubes will be the phase inverter which is actually part of the power amp, not the preamp. Just remember where the 12AT7 goes, maybe write on the chassis near it with a Sharpie so you won't mix them up.
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Cathbard Amplification
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joer526
Registered User
Join date: Jan 2011
30 IQ
#10
I can get some new tubes, but I was hoping to troubleshoot the problem before shelling out the cash in case I wasn't going to keep the amp.

Is the tube replacement something I should do on my own or do I need a tech to do it. I've read of biasing and don't know if I'm equipped to do that. Is that necessary or can i just swap them out?
Cathbard
Grumpy Old Tech
Join date: Oct 2009
240 IQ
#11
That amp has an adjustable fixed bias with a separate pot for each power tube. It should be rebiased. The preamp tubes don't need to be rebiased.

Here's the schematic.
http://www.blueguitar.org/new/schem/electar/Epiphone_Galaxie_25.pdf
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
Cathbard
Grumpy Old Tech
Join date: Oct 2009
240 IQ
#13
Pretty much, yeah. They may work but you are taking a risk.
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