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.50 Caliber Mesa/Boogie Reverb

7/28/2000 5:59 PM
David Warren
.50 Caliber Mesa/Boogie Reverb
My .50 Caliber Mesa/Boogie's Reverb is suddenly intermittent. It was suggested to me that I should replace the 12AX7 reverb driver tube. I did so, then the reverb would never work. With the previous tube back in, it becomes active after the amp has warmed-up for about ten minutes. It was also suggested to me that I replace the stock 12AX7 reverb tube with a 12AT7. The amp's preamp uses 5 12AX7's, was designed that way, and replacing the reverb tube with a 12AT7 would not help, IMHO. Seems that it must be some heat sensitive component, like a capacitor, or the tube I used to replace the stock tube is itself defective. Any suggestions from anyone who has worked on these amps? Mine is the original version of this amp, which uses EL-84/6BQ5 power tubes. Also, I believe it is the same preamp design as used in any of the Studio preamp designs from the mid to late 1980's. Thanks for any help!

Ray Ivers David,It sounds lik... -- 7/28/2000 6:34 PM
joe I had the same problem with my MB M... -- 8/17/2000 8:05 AM