Tube Radio
Super Member
Markus, I'm running them off a V-M SEP 6BQ5 amp/preamp. I am playing around with the feedback circuit to adjust the amount of bass boost. I only wish that I had the original amp for these speakers. Then I could find another one and another pair of speakers and have a nice stereo amp using the same Isophon DP-19 tweeters although I would need 4 of them. At first I used a Magnavox SEP 6BQ5 stereo amp and the original 12" speakers and 5 inch tweeters that came with the two speaker cabinets (one held the phono and amp other just had speakers), then I put in the Isophons and Field coil drivers and got much better sound with better low end response than the original speakers could ever do. The Magnavox 12" field coil drivers and 4" Isophon tweeters are an excellent match for each other. I would like to find another pair of the Magnavox speakers as one cone on mine appears to be thinner and more flexible than the other for some reason which I'm sure affects the sound somewhat, but I cannot tell any difference between the two except at the low end of the audio spectrum only at high volume levels.


