THD, second channel 1T813
just to be sure that there was no heavy weed yesterday, neither for me nor for amp, I made measurements of second channel
didn't bother to match Biguns especially, except with universal measureitallthingie, afterwards Hfe and Ubc are confirmed as similar in T-Bed
8R load
same Wakoosness as first channel
just to be sure that there was no heavy weed yesterday, neither for me nor for amp, I made measurements of second channel
didn't bother to match Biguns especially, except with universal measureitallthingie, afterwards Hfe and Ubc are confirmed as similar in T-Bed
8R load
same Wakoosness as first channel
Attachments
Listening
same
holographic sense as with 2N1099
everything else, in short:
-sense of organicity is there, which must be first quality, considering nature of gain aparatus and lack of overall NFB; so, didn't spoiled that
-mellow, then I tried to observe sense of speed - no lack in that department, too
-Freq. extremes - have no objection
one of my fave albums - see pic - besides MZM liking music on, it is extremely nice tool - spaciousness is exquisite, nothing overproduced or over-edited, and Mile's trumpet is full and detailed ( which isn't the case on some other recordings)
but - one thing especially useful - in enough places, M. trumpet is blasting to the roof, and any link in amplification chain ( and yes, even speakers) would run crying in these moments, while you have ears bleeding
well, no with these boring amps .......... aggression of trumpet sound is here, but green is wide, observing that I'm still in same room, and no bleeding ears
same
holographic sense as with 2N1099everything else, in short:
-sense of organicity is there, which must be first quality, considering nature of gain aparatus and lack of overall NFB; so, didn't spoiled that
-mellow, then I tried to observe sense of speed - no lack in that department, too
-Freq. extremes - have no objection
one of my fave albums - see pic - besides MZM liking music on, it is extremely nice tool - spaciousness is exquisite, nothing overproduced or over-edited, and Mile's trumpet is full and detailed ( which isn't the case on some other recordings)
but - one thing especially useful - in enough places, M. trumpet is blasting to the roof, and any link in amplification chain ( and yes, even speakers) would run crying in these moments, while you have ears bleeding
well, no with these boring amps .......... aggression of trumpet sound is here, but green is wide, observing that I'm still in same room, and no bleeding ears
Attachments
Final Old Soul installment
Old Soul B or Bip, whatever
instead of Ge Bigun, plain and common Si Bigun
All changes needed are - replace part and replace shifting resistor (R122( value from 10R ( adequate for Ge Ube of 180-2--mV) to 22R ( adequate to Si Ube of 650mV), as part which defines current through Level shifting small mosfet M101
Had few 2SA1943
mounted them , fired up and Iq was sorta same as set for Ge - 1A-ish
started upping Iq and fine-tuning DC Offset , did one channel and when I'm almost done, 2SA1943 in that second channel stopped pretending, taking R122 and output mosfet together with him, most probably South
Ok, power down, remove both 2SA1943 , replace R122, replace IRFP240, mount undoubtedly and certainly original 2SA1491
power up, set what is needed , let it cook for a while
and here it is - same wakoo shape of THD Spectra
rails as before, Iq increased to 1A5
Load 8R
Old Soul B or Bip, whatever
instead of Ge Bigun, plain and common Si Bigun
All changes needed are - replace part and replace shifting resistor (R122( value from 10R ( adequate for Ge Ube of 180-2--mV) to 22R ( adequate to Si Ube of 650mV), as part which defines current through Level shifting small mosfet M101
Had few 2SA1943
mounted them , fired up and Iq was sorta same as set for Ge - 1A-ish
started upping Iq and fine-tuning DC Offset , did one channel and when I'm almost done, 2SA1943 in that second channel stopped pretending, taking R122 and output mosfet together with him, most probably South
Ok, power down, remove both 2SA1943 , replace R122, replace IRFP240, mount undoubtedly and certainly original 2SA1491
power up, set what is needed , let it cook for a while
and here it is - same wakoo shape of THD Spectra
rails as before, Iq increased to 1A5
Load 8R
Attachments
didn't given up, I've just used what I had in drawers and knowing it is genuine ( after questionable 1943 went poof)
having small quantity of 2SA1943 ordered via local vendor, getting them from tme.eu - those are genuine no doubt ......
2SA1491 are sorta small brother of 1943, and I like them even more , though they're unobtanium
having small quantity of 2SA1943 ordered via local vendor, getting them from tme.eu - those are genuine no doubt ......
2SA1491 are sorta small brother of 1943, and I like them even more , though they're unobtanium
Always wondered why the NAD freakiness was never discussed here. The NAD 310 started it as far as i remember.