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Squealing Junior ? Rico ?

PostPosted: Sat Mar 28, 2009 4:22 pm
by goldbrick
Found an old Les Paul Junior amp (1954 or so)

Has some feedback and popping that comes and goes even at low volume--

Cleaned eveything inside and looks good. Thinks its a bad preamp tube? Seems to get better the longer its on.


Rico ???

Re: Squealing Junior ? Rico ?

PostPosted: Sun Mar 29, 2009 3:06 am
by ricochet
As I've said (and I wasn't the first to say it), there's a reason why tubes plug into sockets. They have been known to go bad from time to time.

If you want a complete list of plausible causes for the problem presented in a logical fashion, go to http://geofex.com/ and click on "Guitar Amp Tech Pages," then click on "Tube Amp Debugging Page." Look for the symptom.

Re: Squealing Junior ? Rico ?

PostPosted: Sun Mar 29, 2009 4:33 am
by goldbrick
great website--thanks

Re: Squealing Junior ? Rico ?

PostPosted: Sun Mar 29, 2009 2:27 pm
by zhyla
Definitely the preamp tube is suspect. If the power tube(s) were popping you'd know for sure.

Re: Squealing Junior ? Rico ?

PostPosted: Sun Mar 29, 2009 3:12 pm
by goldbrick
Just ordered some nos RCA tubes set of 3 was $39 shipped

Re: Squealing Junior ? Rico ?

PostPosted: Fri Apr 10, 2009 2:34 pm
by Ed Boyd
You should also check the sockets. For a loose tube socket. A loose powertube could cause popping. My old Super Reverb was doing that the other night. That is what it was.

A microphonic tube could be causing the squeal.

What did the capacitors look like? Something you need to watch in old Fenders is sometimes if you replace a bunch of bad tubes you find that the rest of the amp is not up to handling the now more effective front end and other compnents can start to fail....... sometimes. Storing amps in garages in Illinois can wreck havoc on old tube amps. :lol: