Marantz PM250 amplifier no sound (All transistors check OK)

[Lukazita]

I found something! A blown rail fuse! It has blown but it's very hard to see. I will replace both of them and see what happens. Should have measured this in the first place

 

[Lukazita]

Marantz fixed! Thank you!

It was the rail fuse after all! Made the idle current adjustments and all OK. I think it was all down to this fuse in the first place which explained the low positive voltage at the rectifier.

In looking at this amp I have learned a lot about recitifiers and also improved my circuit schematic reading ability.

Thank you to all on here

 

[Mooly]

Thanks for the update Fuses don't always fail with a bang, sometimes the wire just parts away from the endcap.

 

[east electronics]

@Mooly
could you please remind me when me and you are going to get the DIYAUDIO bonus for tele repairing a number of amps ????

xxaxaxaxxxa

 

[Mooly]

My cheque is in the post I think yours is too

 

[east electronics]

hahahahahha Its nice when it works ....i really like it

Best regards
Sakis