Does change of high speed power transistor/rectifier increase the dynamic - diyAudio
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Old 3rd May 2015, 06:13 AM   #1
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Default Does change of high speed power transistor/rectifier increase the dynamic

Just bought a 40 year old Pioneer m22 class A power amp, transparent and sweet sound, 30W class A rating, want to increase the Bass speed and solidity. Changing to high speed rectifier like RHR30 type would help?
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Old 3rd May 2015, 06:40 AM   #2
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Very much no.
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Old 3rd May 2015, 07:10 AM   #3
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Try it on one channel, and you'll see..... Maybe I'm deaf, but for me it DOES make a difference in 9 cases out of ten (done a few dozen conversions like that, and the owners clearly heard improvement too). Maybe they are also deaf..... You should try the filter cap bypassing too with PP-s.
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Old 3rd May 2015, 07:31 AM   #4
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Hi Dragonweed,

Then what sonic improvement would it get if
(1) change to high speed rectifiers for power supply
(2) current 10Mhz freq transition power BJT to 60Mhz BTJ(like 2sa1072..)
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Old 3rd May 2015, 09:00 AM   #5
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What I (we) observed in those cases, is a definite improvement in bass dynamics, overall "speed" - better definition of transients, and a cleaner top octave. I am not trying to convince you (or anyone), try it for yourself, and you will see -it doesn't involve costly parts and time, so it is definitely worth a shot. Be careful with OP transistors though, in some amps swapping them with much faster ones can cause stability issues. If in doubt, use a few ohms (3.3-10) in series with their base legs

Last edited by dragonweed; 3rd May 2015 at 09:04 AM.
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Old 3rd May 2015, 09:31 AM   #6
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If the amplifier designer takes into consideration the hfe of the separate stages, as all designers should do, changing the semiconductors for higher hfe types will change the dynamics. Simply expecting a 20MHZ top speed transistor to sound better than say a 5MHZ transistor, is pure folly.
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Old 3rd May 2015, 09:54 AM   #7
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Then it must be our collective imagination... I'm beyond the point now, to get into arguments over this or any similar subject. If you believe so, then let it be....
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Old 3rd May 2015, 10:08 AM   #8
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Originally Posted by dragonweed View Post
Then it must be our collective imagination... I'm beyond the point now, to get into arguments over this or any similar subject. If you believe so, then let it be....
Unless you can reliably and accurately tell the difference in double blind tests, then it's your imagination
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Old 3rd May 2015, 10:11 AM   #9
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The only thing I would pay attention to - electrolytic capacitors. This is what really influences the bass dynamic.

Transistors - tricky thing as there are many other parameters except Ft - in some cases, changing transistors will also require changing compensation.

Anyway, all the rest is a "mystery". In a proper blind A/B test you will never recognize neither faster rectifiers, nor transistors with higher Ft in such an amp. There will be no difference. Especially, bearing in mind, it's class A (no switching).
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Old 3rd May 2015, 10:12 AM   #10
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Huh, Nigel - just typed at the same time, basically the same thing
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