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In Reply to: RE: final schem for the 26 preamp posted by SteveBrown on August 18, 2015 at 07:55:59
I don't know if I should even tell you this now, but that is the preamp the 26 will be replacing. My 76 is the Bruce Bernam design from SP issue 13, the one that the JE labs preamp is based on. Both are great preamps, and I am sure you will be very happy with yours. Congratulations on a good diy project!I built mine several years ago and it has been my only preamp up until I breadboarded this 26 circuit. The 26 seems to have some real magic driving a dht triode like the 300B's I use in my 91A clone.
What amp are you using the preamp with? If it has dht triode output tubes you might want to breadboard the 26 just for a comparison. It is a very simple circuit and takes no time to put together. It was the debugging that drove me crazy, but you may not have that problem.
Edits: 08/18/15 08/18/15Follow Ups:
Well the preamp sounds pretty nice, and given the 6SN7 cathode follower, can drive difficult loads, but so far I knid of like my old preamp better - a simple 5687. Granted, the new one only has 4 or 5 hours on it, so break in is needed. The amp varies from time to time, right now it is a 6BQ5 driving a 300B (ala Thorston's design). I do have some 4P1L in line for my next project so that I can try the DHT approach. It was fun to heat up the soldering iron again, my DIY efforts have been pretty quiet for the last couple years. That's also partly because other people's broken amps have been on my bench taking priority.
Watch out Steve, you are going to get the building bug again!
That's what I like about using my breadboard setup. I cam put most things together in a day or so and play around with tweaks and see if I like it before I put the time and money into building something permanent. I really enjoy building new gear and the breadboard makes it cheap and easy.
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