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Post subject: 65 Reissue Twin making crackling/hissing sound after an hour
Posted: Fri Jun 05, 2009 1:35 pm
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See now, I KNEW I should wait a while before I start blogging about how great of a deal I got on a used 65 Reissue Twin! The guy I bought it off must have known about this problem, especially since it takes about an hour to start happening, because he let me have a 10-minute LOUD demo session before I bought it. And here I was thinking I got a great deal...

Anyway, it makes a semi-loud crackling/hissing sound that is not affected by the volume control or reverb and it seems to be ignorant to whatever notes I am playing. It just keeps going like its own soundtrack. After the amp is warm it starts. I can turn it off and then back on and if it is still warm it begins immediately.

Any suggestions?

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Posted: Mon Jun 08, 2009 11:40 am
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How old are the tubes. First thing I would do is put new power and preamp tubes in it. It doesn't sound like anything serious. Could also be a solder connection once it heats up it doesn't have good connection.

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Posted: Tue Jun 09, 2009 4:59 am
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I have not had the tubes checked as yet. As far as I know they are the original tubes, which would be pretty old. I was hoping to gather a few opinions from people who have had experience with this symptom before I start throwing money at this, but that is a valid point. And I suppose warmth and vibration might cause a questionable solder joint to worsen. I am hoping this is nothing more serious than a tube or two or maybe a bad cap somewhere.

This is one of those annoying problems that does not prevent the use of the amp in a casual situation, but renders it unusable for recording or at a big show where the band's sound is under scrutiny.

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Posted: Tue Jun 09, 2009 6:21 am
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LaroldC wrote:
I have not had the tubes checked as yet. As far as I know they are the original tubes, which would be pretty old. I was hoping to gather a few opinions from people who have had experience with this symptom before I start throwing money at this, but that is a valid point. And I suppose warmth and vibration might cause a questionable solder joint to worsen. I am hoping this is nothing more serious than a tube or two or maybe a bad cap somewhere.

This is one of those annoying problems that does not prevent the use of the amp in a casual situation, but renders it unusable for recording or at a big show where the band's sound is under scrutiny.

You can't expect the amp to fix itself without spending a little money. Tubes are the main item that cause problems. The amp is worth fixing. Start with the easy stuff first and work your way thru it. Easy to do a cleaning with contact cleaner in all efx loop jacks and inputs. Spray in and work a plug in and out. Cleans jack contacts. Buy a few good preamp tubes then as you can afford it get new power tubes. Most likely you will have found the problem once you have done that. If not then explore the condition of the caps. Remember that the amp needs this attention anyway. Old tubes need to be changed. Correct bias on your power tubes and you should be good for a year or two.

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Posted: Tue Jun 09, 2009 11:50 am
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Does it hiss even when no guitar plugged in? Have you tried powering it on with no tubes, then see if it still hisses?


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Posted: Thu Jun 11, 2009 5:20 am
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Yes, it hisses/crackles even with nothing plugged into any jack. Once warm, it starts hissing, and no turned knob or flipped switch seems to affect it. I have even tried lightly impacting the chassis and it has no effect on the hissing sound. I have not tried listening for it while in standby, I will check that out.

Sorry to appear so dumb on this subject, but I have no experience with this stuff. I have never had to change any tubes as most of my gear is fairly new and I have been lucky with reliability. I have never owned an amp this old -- or this nice -- before. I guess it is going to need some TLC. I just wanted to get initial feedback from other Fender owners in an effort to keep costs down initially. I know it's worth it to tune it up. Regardless of the issue it is having, it is probably time to update the tubes anyway.

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Posted: Thu Jun 11, 2009 5:26 am
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Old tube amps are full of tone but temperamental, replacing the tubes is something you can easily do yourself if one is cracked but keep in mind it might need re biased.


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Posted: Thu Jun 11, 2009 7:10 am
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Well, thanks for the advice. I will take 'er to a pro shop for service. While there I'll have them update any questionable tubes and bias what needs to be biased.

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Posted: Thu Jun 11, 2009 7:11 am
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Re-biasing or not it still needs to be done. If you think it sounds good now wait til you change all the tubes.

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Posted: Tue Jun 30, 2009 8:29 am
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Well, I had a shop look at it. They replaced one pre- and one post- tube and although the hissing has stopped, there is still an occasional crackle, but it is infrequent, quieter, and basically negligible. It could be a dirty pot somewhere or a small ESD arc across some circuit (hopefully not frying anything). I guess I have to chalk it up to the amp being old. If this is as good as it is going to sound without overhauling it competely, then it is still a great amp, but maybe not for recording. It will serve as a tremendous stage backup, which is probably beneath its stature, but at least it is useable now. Lesson learned: NEVER BUY A BIG AMP WITHOUT A WARRANTY (i.e., from a private seller).

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Posted: Tue Jun 30, 2009 11:24 am
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Which tubes exactly did he change? I am suffering similar problems with my RI and any leads would be appreciated. Look at my post:

http://www.fender.com/community/forums/viewtopic.php?t=24268

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Posted: Tue Jun 30, 2009 12:50 pm
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Last edited by tinker tech on Wed Jul 29, 2009 10:59 am, edited 2 times in total.

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Posted: Tue Jul 07, 2009 8:30 pm
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I get some hissing every now and then. I just pull the tubes out one by one and put them back in. That seems to cure it for a few months. I guess electricity build up after a while or contact becomes compromised and pulling them cleans it up. :idea:


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Posted: Wed Jul 08, 2009 5:12 am
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mylesw wrote:
I get some hissing every now and then. I just pull the tubes out one by one and put them back in. That seems to cure it for a few months. I guess electricity build up after a while or contact becomes compromised and pulling them cleans it up. :idea:

Spray some contact cleaner on the pins and work the tubes in and out a few times.

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Post subject: Twin Reverb RI
Posted: Fri Jul 10, 2009 8:19 pm
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Hi, does the amp make the arcing noise if it's left on for an hour without playing it at all? After the tech looked at it did the arcing stop? IMHO the heat related problem is neither pot nor resistor degradation. A bad solder joint would usually make a commotion when the amp is bumped or rocked and would cease when left still(hot or cold). A good tube socket and retentioning , jack and plug cleaning should be done before tube R&R. Art


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