View Single Post
Old 8th Jul 2019, 8:00 pm   #14
Luxman1050
Octode
 
Luxman1050's Avatar
 
Join Date: Apr 2019
Location: Margate, Kent, UK.
Posts: 1,728
Default Re: Quad FM1 questions

Well guys I have some serious issues going on here.
I know at one stage I left the mono block on for about 10 minutes before realising I had no load attached.

I think the mains transformer is knackered or on it's way out.

Mains transformer
no power on 240v pin.
HT 5v?
5V reading 375v
6.3v no reading

Choke
373v
capacitor/resistor side 22v

Smoothing caps positive both read 374v

Output transformer
Z&X 376v
Y 374v

GZ34
Pin 1 375v
pin 4 5v

KT66 both valves
pin 2 5.2mV
pin 4 363v
pin 6 363v

EF86 both valves
pin 1 97v
pin 6 363v

So do you think I have knackered mains transformer?

That explains the bad distortion on volume me thinks way to much voltage. So definitely is not the pre amp.

Any ideas?

Cheers Chris
Luxman1050 is offline