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Old amp boards unusual topology
Old amp boards unusual topology
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Old 9th February 2018, 10:33 AM   #1
hahfran is offline hahfran  Germany
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Default Old amp boards unusual topology

Is it worth to fix these old amps? The advantage: nice small boards. Q12 to Q17 sit on a separate PCB the transistors mounted on aluminum profile intended to be mounted on heatsink. The original transistors are either unknown or discontinued for many years thus the simulation is with available and reliable Spice models. I am unsure whether the Wilson mirror (?) makes sense at all.
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Old 9th February 2018, 11:00 AM   #2
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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Old 9th February 2018, 11:48 AM   #3
Ketje is offline Ketje  Belgium
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My 2c.
Mona
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Old 11th February 2018, 01:25 PM   #4
hahfran is offline hahfran  Germany
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Quote:
Originally Posted by Ketje View Post
My 2c.
Mona
cannot work.
Replaced EF drivers possibly dead from breakdown or second breakdown the power 2N6030 2N5630 seemingly ok. possibly operator error caused failure. Output short. Still don't know what designer "had in mind" with the Wilson mirror but will keep it as bass driver in active speaker
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Old 12th February 2018, 06:54 AM   #5
aparatusonitus is offline aparatusonitus  Croatia
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Quote:
Originally Posted by hahfran View Post
Still don't know what designer "had in mind" with the Wilson mirror but will keep it as bass driver in active speaker
Push-pull VAS (TIS) I guess...
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