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In Reply to: RE: tube reverb driver in Guitar amp - impedance matching question posted by bdgregory on March 03, 2015 at 08:56:50
More impedance is not going to run anything too hard, what you would get is less output. With an output transformer, you would use a tank with a similar impedance as a speaker, like 8 ohms. The higher impedance tanks are used with transformers with less step down. The only damage will happen when you overly load down the tube.
That being said, if you want the reverb to function like it was designed, you have to either get the original transformer to go with the tanks higher impedance or get a lower impedance tank. An 8 ohm tank will set you back $20.
Follow Ups:
Almost all vintage Gibson amps use a 4FBxxxx tank. The input impedence is 1,475 Ohms. They read 200 Ohms DCR.
That original output transformer in the drive circuit is unobtanium. The OP mentioned needing one. The logical thing to do is to replace tank and transformer with 8 Ohm stuff.
thanks, understood. I have 3 tanks on hand for use - the original gibson (1475 input impedance), a Fender (8 ohms impedance), and one out of a Peavey amp (600 ohms). I just tried the Peavey tank and it seems to sound best, and be the most stable.
I'm trying to use this little OT for now while I tune up the amp to see if I can make it suck less ;-). I just don't want to damage anything in the process. If I can get the amp sounding to my satisfaction, I'll likely drop the $60 to get the Mercury Magnetics replacement transformer. If not, I'll buy a $8 Fender reverb transformer and put it in (or maybe just leave the OT in) there and use the Fender tank. Until then, I'm trying to avoid dropping to much in parts just to turn around and sell it at a loss.
thanks again to everyone.
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