Krell KSA 50 PCB

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#30
It was a "smart trick"
it hides the basic sound quality of the incredeble poor schematics......its called "floating ground" :dead:

Musical Fidelity used "floating ground" as well for there P270 and A370



Removed my comments on Krell engineering or lack of same 🙄

Should not spoile your fun 😉
 
#34
Yes, there is an obvious (symetrical) error on schematic that I gave link to. Base of TR10 should be connected with collector of TR8. As T11 with TR7. Thats, it. Waiting for suggestions on low power transistor replacements. Thanks all for contributing.

Regards,
Zoran
 
#37
Jan, it must to stay Krell, not to be DuDu ( Dupont - Dudek ) 😀 , so only little notices : Q 105 - MPSA 92, Q 106 - MPSA 42 - Pc in this position is not big, so there is 0,5 W Pc enough ( MPSA .. or MPSW .. family ). Q 111 - give there some transistor in TO 126 ML ( full insulated - easy mounting ), such as 2 SC 3955 or similar. C 109 - give bigger value ( cca M1 - 1 M / 63 V). Current sense ( R 301, 302 ) is better to lead from both emiters of power devices ( value 4*200 R ). Give on rails blocking capacity ( + to G, - to G and + to - ). Other improvement are not required, 'cos Daniel d' Agostino is boss 😎 .
 
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