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Bryston 4B SST clone
Bryston 4B SST clone
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Old 23rd May 2020, 02:17 PM   #441
amplidude is online now amplidude  Denmark
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They might work, but the bryston is made with " slow" transistors mjl21193/94 are 4mhz the mentioned are 30 mhz, you might end up with a high power oscillator, but nothing some pf bypass caps couldn't handle.
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Old 23rd May 2020, 02:50 PM   #442
chalky is offline chalky
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I tried making ( as opposed to simulating ) a Bryston style output stage with bjts driving lateral mosfet output devices and it oscillated nicely. The trick is to ensure stability without completley killing the hf performance - sometimes that's not so easy.
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Old 23rd May 2020, 06:13 PM   #443
amplidude is online now amplidude  Denmark
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Absolutely right, it's all about giving and taking.
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Old 23rd May 2020, 07:47 PM   #444
hschier is offline hschier  Chile
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Quote:
Originally Posted by amplidude View Post
They might work, but the bryston is made with " slow" transistors mjl21193/94 are 4mhz the mentioned are 30 mhz, you might end up with a high power oscillator, but nothing some pf bypass caps couldn't handle.
Between gate and earth?
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Old 23rd May 2020, 08:10 PM   #445
chalky is offline chalky
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I think something like 100pf in series with 100R between gate and drain would be a good place to start. With mosfets you can also slip a ferrite bead on the gate lead in lieu of or as well as a gate stopper resistor. Some people don't like ferrite beads but they work for me. Thing is if you're going to use different parts you need to be prepared to experiment - preferably using a power supply with an adjustable current limit.
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Old 23rd May 2020, 08:21 PM   #446
amplidude is online now amplidude  Denmark
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You could also start with lower value, say 33pf, se its stable , if not increase, and yes beads work, I had trouble with greg ball ska amp, and they helped.
You should aim for lowest value possible
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Old 23rd May 2020, 08:42 PM   #447
josejuancano is offline josejuancano  Spain
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Default diameter of the inductor

Friends, what is diameter of inductor L1, seller an boom list ask 1,8mm cooper wire nameled and 10 turns but not speak diameter, you know something?
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File Type: pdf BRYSTON-28B-SST2_Rev:2.0.pdf (100.2 KB, 40 views)
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Old 24th May 2020, 09:17 PM   #448
hschier is offline hschier  Chile
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Quote:
Originally Posted by amplidude View Post
You could also start with lower value, say 33pf, se its stable , if not increase, and yes beads work, I had trouble with greg ball ska amp, and they helped.
You should aim for lowest value possible
when you said stable you mean not distortion?
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Old 25th May 2020, 08:59 AM   #449
josejuancano is offline josejuancano  Spain
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Default Transformer T1 pcb filter

Friends what buy transformer compatiblity for this pcb 220v/ 12v encapsulated, thanks
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Old 25th May 2020, 10:34 AM   #450
amplidude is online now amplidude  Denmark
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Quote:
Originally Posted by hschier View Post
when you said stable you mean not distortion?
With stable I mean , no oscillation, lower value capacitor means better hf performance, and as chalky said it has to be a rc.
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