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Old 10th April 2021, 07:46 PM   #11
codyt is offline codyt  United States
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Old Soul
Nice! And 1A sounds nice too I think I’m going to need to become proficient in angle iron and metalwork to mate those funny cases to a sink
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Soekris 1321 | Pearl II > B1v1 / B1v2 / B1K / H2v2 / BA1FE / BA3FE / WBA18 / ACP+ / GW-SRPP > F4 / F5(K1530/J201) / F6 / AJ / AJSS / ZMJ2 / SONY VFET-SE > Spendor 3/1
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Old 10th April 2021, 07:59 PM   #12
Zen Mod is offline Zen Mod  Serbia
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before anyone asks, to note:

biasing and drive - everything explained in LuDEF thread , posts #32-37, LuDEF , applied here too

only that level shifting source follower put in front of Ge in bottom half; due to fact that Ge needs 180-250mV EB voltage, looking at schm B lower than E, there is no need for separate CCS load for source follower - it's simply tied to output/Ge emiter node

(R122) 22R resistor value (in bracket) is sole change needed for 2SA1943

in case of Ge SF current is 180mV/10R

in case of bjt SF current is 650mV/22R
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Old 10th April 2021, 08:35 PM   #13
analog_sa is online now analog_sa  Europe
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Nice. The 1T813 should fix the hf issue.
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Old 10th April 2021, 08:40 PM   #14
Zen Mod is offline Zen Mod  Serbia
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nope;

2 reasons:
- same roll-off seen on all autoformer gain amps I made, whichever combo is in output , differences are not significant
- sound-wise - no lack of highs, and my speakers are not bright ones ( so no any compensation)
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Old 10th April 2021, 08:51 PM   #15
AlexRivera is offline AlexRivera  United States
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Awesome, way too many amps to keep ourselves busy!!!
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Old 10th April 2021, 08:59 PM   #16
Berny is online now Berny  Belgium
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Oh no... as I already said, it is going to rain amps in 2021. Life is all about choices... but what if there are too many and that you can't chose?!
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Old 10th April 2021, 09:21 PM   #17
Zen Mod is offline Zen Mod  Serbia
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as I said, can't help with that ... mine is to make them, not to choose them



teaser of next one
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Old 10th April 2021, 09:23 PM   #18
overtheairbroadcast is offline overtheairbroadcast  Canada
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Berney, then there's only one thing to do -- buy them all, build them all, and figure out which one suits your ears.

I expect at the end of the day, you will see the Aleph J, MoFo, George's Simple SE, and the EL84 Baby Huey. The Sony VFET and SITs will come in strong.
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Old 10th April 2021, 09:38 PM   #19
Berny is online now Berny  Belgium
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The issue is, hobby-time is limited... and yes, that is with the right priorities first (3-year & 6-year old + all the rest ;-))
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Old 10th April 2021, 09:45 PM   #20
vvs07 is online now vvs07  United States
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I remember old times using Soviet GE PNP ГТ806 as a complementary to SI NPN КТ802.
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