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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: 6883B plate dissipation IS 35 watts, not 20 posted by Caucasian Blackplate on April 11, 2015 at 07:16:21:
I've been using this amp for several months now, with the following results:
1) Dropped the bias to 40 ma, and the results have been fine from a reliability standpoint. I had a couple of tubes go early in this project. The failed tubes all had a mid 80's date code from the same time frame. Swapped in tubes with 70's date codes, dropped the bias to 40 ma, and it's been great since.
2) Swapped out the coupling caps to Jupiter Copper foils, and that improved overall performance significantly. The mid range is much more open and life like sounding, and the treble sounds clearer as well.
3) The 6BL7 is a great driver tube. MUCH quieter than the 12SN7. In fact, it is so much better, I'm going to change out the driver tubes in my 1625 DIY amp to run 6BL7's.
All in all, this has been a worth while project. The sound from this amp is outstanding. Very happy with the results.
" Don't look back. Something may be gaining on you"
Satchel Paige
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Follow Ups
- Update on amp-excellent results - Freo-1 12:20:16 09/04/15 (1)
- RE: Can you post a schematic of the 6bl7 front end to the outputs - DAK 12:49:08 09/04/15 (0)
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