Need help identifying these

[madsno]

Hello everyone. I'm new to this forum and to the DIY world. Really appreciate if anyone here can help me. I
found this set in a thrift store today. Can anyone help identify it? I see it says "Pass Labs Clone" on the circuit board in one.
Anyone know anything more? Thank you very much in advance.

 

[Zen Mod]

Aleph P

you'll find service manual on forum

 

[rayma]

Great luck, check it out carefully before powering. Then use bulb tester, Variac, etc.

 

[Richard Ellis]

In your very first picture we see eight three-pin devices, PER channel! I don't know about anyone else...but if a device, any device has a heatsink tab & and/or hole bored thru it , I'll put a heatsink assembly on it ...I don't care if it's running at a tenth of its rating, even a derated value, put a heatsink on it!...that's why those tabs are there.

-----------------------------------------------------------------------------------------------------------------------Rick...

 

[Zen Mod]

these are most likely diode bridges

and with Aleph P current consumption, they're cold

 

[Dennis Hui]

Looks like it's KK's version of the Balanced Zen line stage: https://www.kk-pcb.net/bls.html

Original project document from Papa: https://firstwatt.com/pdf/art_bosoz.pdf

 

[twitchie]

and probably a chip amp. My bet is that it's a gainclone variant

 

[NareshBrd]

Chassis mounted chip amps, probably 3886.
Down at left and right on picture, using case as heat sink.

 

[generg]

Dennis has my vote...!

:--)

 

[Zen Mod]

Of course that Dennis got it right

 

[madsno]

Thank you so much for the feedback everyone.
I started them today. Worked just fine. It was probably a good buy for 250 Norwegian kroner (approx. 25 USD) :-D

 

[Mikerodrig27]

Killer buy. I have a BOSOZ KKpcb amp and it sounds very good.