112 RD-50 breakup on clean channel

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Author Message   Larrybud Posted on Friday, June 14, 2002 - 06:27 pm:    My 112 RD-50 seems to break up more than I would expect. It sounds good, but I'm interested in a little more headroom. It has new tubes, speaker, filter caps,etc. Are any of the IC's a possible cause? Also, the reverb has some hiss as you turn it up. Help is much appreciated.   Michael Kaus Posted on Saturday, June 15, 2002 - 09:15 am:    What kind of tubes did you install? Some power tubes tend to break up REAL easy. Amperex breaks up real early. Old Sylvania's are real clean. The later versions are cathode biased(I think) so your bias shouldn't be too out of wack unless the driver board has a problem. Point is, power tubes can change A lot. Mike.   Larrybud Posted on Saturday, June 15, 2002 - 03:01 pm:    Thanks, Mike. My tubes are Svetlana 6L6, so I'm fairly confident it's not power tubes. Any other suggestions? I'm also looking for a source of Sprague Atom caps in Music Man values.   keith Posted on Monday, August 26, 2002 - 01:22 am:    I own a 112RP 65 and have had what I was told was the "output transistor" go on me twice in the past 6 months. Can anyone let me know what might cause this to happen? I'm really curious.Thanks   Terry Posted on Tuesday, August 27, 2002 - 11:18 am:    This is for LARRYBUD & KEITH You may not be using the right transistor, You should use 2N6488. You can get them at mouser.com PH#800-346-6873 Thay all so have the Sprague caps .