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Old 09-27-2012, 02:02 AM   #1
psychokiller99
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tube swap didn't fix my amp

I made a thread a couple months ago which you can read here.

http://www.ultimate-guitar.com/foru...58#post30084358

basically my amp was having volume issues and most people recommended I swap out the power tubes. I swapped out the preamp tubes after also replacing the power tubes and my problem is still unsolved. There is an interesting thing though :

After installing the new tubes I was pretty frustrated so I just left my amp alone for a couple weeks. Finally I turned it back on and voila! It was as if nothing had ever gone wrong. I was able to play at a low volume all week until practice came around. Well during practice I manage to get through one song at full volume and in the middle of the second song my volume drops to about 10%. All I got was the fizzy quiet tone described in my original post. Does anybody have any ideas as to what it might be? Could it be a faulty input jack? Thanks in advance for any replies.
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Old 09-27-2012, 02:10 AM   #2
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I assume you tried different cables and guitar? And took all pedals out of the chain to insure that isn't the problem?

Assuming that, try cleaning the jacks with some contact cleaner. Spray a little on a plug and work it in and out. I'd do the same with the tube sockets. Spray a little on the pins of the tubes and work them in and out of the socket.

If you're still having problems, replace the input jack and the speaker jack (assuming it has one) with some switch crafts and see if that doesn't solve the problem.
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Old 09-27-2012, 02:16 AM   #3
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Did you switch out the cable between the head and cab? It's supposed to be a speaker cable so it can handle the current.
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Old 09-27-2012, 02:21 AM   #4
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I've done everything you suggested Kevin. I'm not sure what you mean by switch crafts. Is it difficult to switch out the jacks? I don't have a ton of experience with a soldering iron, but I'm not terrible with it. I just have shaky hands.

@R45VT I've used both the cable from my combo to my cab as well as the cable from my amp to the speaker that it came with. Doesn't seem to make a difference. It sounds like you guys think it could be faulty jacks somewhere huh?
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Last edited by psychokiller99 : 09-27-2012 at 02:22 AM.
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Old 09-27-2012, 02:33 AM   #5
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At this point I don't think so. It could be but typically you get noise along with it.

How often is it doing it? I mean once it starts does it do it again all the time or only after you have been playing a while?

Could you describe the symptoms again? Also does it do it on both channels?(assuming its not a single channel)
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Old 09-27-2012, 03:13 AM   #6
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Is there an increase in mains hum when it happens?
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Old 09-27-2012, 08:12 AM   #7
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Can you get a recording?
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Old 09-27-2012, 02:17 PM   #8
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hey guys sorry for the lat reply. Way past my bedtime. To answer the previous questions -

When it happens it stays that way. Before It appeared that I could play indefinitely at a low bedroom volume without any problems. It didn't last more than 7-10 minutes at a full practice volume.

I just turned it on after a couple of weeks without using it and it looks like the time off didn't help like last time. The main symptom is just really low volume. The tone isn't terribly degraded, but even at max volume, I couldn't play with a drummer. The only thing is that the tone is a little farty if there is a lot of low end. It just sounds like a weak signal. Yes it does it on both channels.

To answer Cathbard's question, there isn't any extra noise associated with the drop in volume. Before this all happened though, I noticed there was some crackling going on while i was playing, especially if there was a spike in the higher frequencies. I just chalked this up to old tubes though.

I would make a recording, but I don't think you'll notice anything unusual. The tone sounds pretty normal, without any extra noise. It's just about 200 - 300% quieter.

I think I've answered all the questions from last night. Hope you guys see this.
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Last edited by psychokiller99 : 09-27-2012 at 02:21 PM.
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Old 09-27-2012, 02:22 PM   #9
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I'm going to go with dirty potentiometer. See if it temporarly goes away if you give the gain/volume knobs a thorough workout.
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Old 09-27-2012, 03:53 PM   #10
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if a dirty pot is the problem it would have to be the master volume since my problem is on both channels right?
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Old 09-28-2012, 12:04 AM   #11
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Could be a cracked solder joint on one of the pots or jacks. Just need to reflow the solder.
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Old 09-28-2012, 08:53 AM   #12
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Just send it to repair.
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