You’ll have to give me a clue to help decipher that . . . .no
send them to OPLDF
I can almost answer that - it depends on the application.
2SK180 is perhaps better for smaller power amp.
I was wondering just this morning about the fabrication differences (if any) between these Tokins and the Sony/Yamaha VFETs, and whether it all comes down to application, or if those designed specifically for audio are inherently a cut above the elevator shakers (lol table shakers).
Of course, this question could quickly diverge into a technical deep dive on transistor specs and selection, but on a high level, I'd imagine the Tokins should be able to keep up if used in a proper circuit, yeah? 🙂
Of course, this question could quickly diverge into a technical deep dive on transistor specs and selection, but on a high level, I'd imagine the Tokins should be able to keep up if used in a proper circuit, yeah? 🙂
you can read something about measured performance differences between THF51, 2SK180 and 2SK182, in common source application , in Singing Bush thread(s) - practically Papa's amp presented on BAF 2015 (hope got year correctly)
SissySIT is made primarily with THF51, and I always wrote that I'm expecting differences between those 3 SIT types being smaller in DEF circuit, than they are in common source (Singing Bush) one
I did some SissySIT tests with remaining two, in place of THF51, but was lazy to document them in any way - when I heard how they sung, I just didn't care for any measurements
Pa took some serious work with smaller ones (Sony), so I just didn't found them so damn provocative to play with ..... especially because he made that one (first!, I believe ) also presented on BAF - just input xformer and two VFets
that one is worthy, pure poetry .... and it was sorta pitty that he didn't made complete Jewel in lieu of M2** ..... maybe I'll try to play with that one, to make something enough different that I can call it Babelfish
my main efforts were put to investigate is it possible to make DEFiSIT for masses ....... and I'm damn pleased how it becomes
**if I'm going high whenever I think of Geniality of M2, imagine how high would I be in case that Pa made that, as finished package......anyway, there is still a weak chance of me having Lucida Intervala and actually getting to challenge ..... in fact, this is first time I ever think of that .......
huh, I must suppress my self now, need some sleep tonight .....
SissySIT is made primarily with THF51, and I always wrote that I'm expecting differences between those 3 SIT types being smaller in DEF circuit, than they are in common source (Singing Bush) one
I did some SissySIT tests with remaining two, in place of THF51, but was lazy to document them in any way - when I heard how they sung, I just didn't care for any measurements
Pa took some serious work with smaller ones (Sony), so I just didn't found them so damn provocative to play with ..... especially because he made that one (first!, I believe ) also presented on BAF - just input xformer and two VFets
that one is worthy, pure poetry .... and it was sorta pitty that he didn't made complete Jewel in lieu of M2** ..... maybe I'll try to play with that one, to make something enough different that I can call it Babelfish
my main efforts were put to investigate is it possible to make DEFiSIT for masses ....... and I'm damn pleased how it becomes
**if I'm going high whenever I think of Geniality of M2, imagine how high would I be in case that Pa made that, as finished package......anyway, there is still a weak chance of me having Lucida Intervala and actually getting to challenge ..... in fact, this is first time I ever think of that .......
huh, I must suppress my self now, need some sleep tonight .....
The mighty ZM actually sleeps?! 😉
Thanks for all that background, tho. It'll be interesting to see what all comes out of the research and exploration on SITs within this community over time.
I'm personally excited to obtain the remaining parts to complete the SissySIT in the meantime. 🙂
Thanks for all that background, tho. It'll be interesting to see what all comes out of the research and exploration on SITs within this community over time.
I'm personally excited to obtain the remaining parts to complete the SissySIT in the meantime. 🙂
Wired mine up (finally) today.
New switch board working fine, to sure about the LED in the bulgin momentary switch. I can get it to come on with the wires either way. Power on, with delay, and power off fine.
1) first board I could get 160 mv fine, and finally got DC offset close. FE set fine.
2) Other board set up nicely. 160, DC good, FE good. Biased up to 198, with 0 DC offset.
3) Back to first board, Bias tops at 194 mv. DC offset stuck at -13.x volts, and does not move with the pot.
verified both boards getting 22.3v under load.
Suggestions?
New switch board working fine, to sure about the LED in the bulgin momentary switch. I can get it to come on with the wires either way. Power on, with delay, and power off fine.
1) first board I could get 160 mv fine, and finally got DC offset close. FE set fine.
2) Other board set up nicely. 160, DC good, FE good. Biased up to 198, with 0 DC offset.
3) Back to first board, Bias tops at 194 mv. DC offset stuck at -13.x volts, and does not move with the pot.
verified both boards getting 22.3v under load.
Suggestions?
clarify about first channel
with Iq 194mV across 0R11 ( is it Rev.3 or Rev.2 Sissy?) DC offset is ooked up;
what is DC Offset with Iq as previously - 160mV across 0R11?
with Iq 194mV across 0R11 ( is it Rev.3 or Rev.2 Sissy?) DC offset is ooked up;
what is DC Offset with Iq as previously - 160mV across 0R11?
SissySIT R3. THF-51S from watanabletomoaki (roughly matched)
I never got bias up over 160mv across 0R11, and that DC offset went under 2v. When I returned from doing the second scanner, I figured the voltage drop from second board hookup might smooth it out, but it got worse instead.
max Bias is 164, not 194 (my mistake above), with offset -13v or so, and unchanged by turning to offset pot.
* went for a walk * I’ll take another look at it after I clean up.
I never got bias up over 160mv across 0R11, and that DC offset went under 2v. When I returned from doing the second scanner, I figured the voltage drop from second board hookup might smooth it out, but it got worse instead.
max Bias is 164, not 194 (my mistake above), with offset -13v or so, and unchanged by turning to offset pot.
* went for a walk * I’ll take another look at it after I clean up.
go back to, say, 130-140mV across 0R11 and tell me what DC offset is then
also, ref to schm. in post #1, give me voltages at gates of M101, M102
confirm that you have ~0V65dc across R114
also, ref to schm. in post #1, give me voltages at gates of M101, M102
confirm that you have ~0V65dc across R114
I could go back and forth across 0mv at 160ish
at 198mv, and I got there easy enough, I could not really set offset. As I moved the offset pot, it would change a few mv, then go back to:
I’ll work on those other measure, thanks for the kit, and the help!
