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Post some photos of the amp. Someone might be able to trace out the circuit diagram. This sort of thing is good to know. Mark

Does the amp have reverb? My old Boogie had reverb and it use to feedback when I turned the reverb up. The springs in the reverb use to react with the speaker. The howling, is the something new or has the amp always done it? Mark

Dear John Thanks for the tip. I have had a look at the Heartbreaker circuits and what you say is true. The circuit is a variation on the Mark 1 theme. I did try and look for a Lonestar circuit without any luck. Should you know of a site that has the circuit, I would like to see it. I will...

Dear James I bought an SOB Boogie some years ago which had been modded and was in a poor state. I found that the amp didn't ever sound "right", this turned out to be the cathode bypass caps in the pre-amp stages having gone short circuit. The amp worked okay after that, but never had the...

Dear Kdove From my limited experience, I've found that in the (Fender) open back designs, four 10" speakers sound better than one or two 10" speakers. I have found the 4 X 10" speakers to have the nice bass response of 12" speaker setup, but with that 10" speaker sound. I dare say a different...

Dear Boogie babies I noticed that you gave one of the guys some technical advice on replacing the fetron. I was wondering what technical advice you could offer me. Thanks for your assistance. Yours Sincerely Mark Abbott

Gil Ayan's mods were quite popular with the reissue amps. There are quite a few different Mark 1 circuits. The first mark 1 amps did have a reputation for being a bright precussive amp. When I bought my Mark 1 it had more midrange to the tone. I have often wondered why certain amps were very...

I own a SOB amp which I converted to a Mark 1. That is to say I changed the phase invertor (which had the limit control) the the Mark 1 reissue PI. Which worked much better with this amp. I use to own an early Mark 1 amp many years ago, and I seem to recall the PI was different from the...