SSE/KT-88/Transcendar OPT: UL? CFB? Why?
I just finished my second TSSE build (after the 300B TSE needed to be shelved for now due to some issues I can't fix given my current knowledge level...).
- Hammond 274BX PT
- 193J choke and ASC motor run cap
- EH 12AT7 and KT-88
- 5k Transcendar OPTs
- 470Ohm for R17/R27 (cathode res.)
- Auricaps coupling caps
It sounded great out the gate without UL or CFB. As others have noted, amazing low and mid frequency sound (it actually has quite a punch and I am testing with cheap-ish Polk Audio floor standers), but definitely less detail than the first EL34-based I built.
I just hooked up the UL tap and don't hear much of a difference.
Has someone by any chance built a TSSE with similar iron and tubes and experimented with the UL and CFB options? It's easy enough to try, but I am wondering what I can expect with either of these options, and/or with both of them combined.
I also have a pair of UBT-3 OPTs lying around, but they don't seem to be a good match given 450V of B+. George may try them just to see how much smoke they make.... :D
I am not really looking for things that show up only on an FFT Spectrum Analyzer, but mostly for audible improvements. I listen to all different kinds of stuff depending on mood. It could be Charlie Hunter one day and AC/DC the next. :cool:
Anyway, I'd be curious to see what other folks' experiments with UL/CFB have resulted in (pointers to other similar discussions I have overlooked are perfectly OK).
I'll experiment some and see if I can tell any difference in sound with the various options, but may stick with basic triode mode myself, since it already sounds pretty fantastic.
And yes, the newer Transcendars have a 40% UL tap.
Have a good weekend!
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