Right on, it sounds pretty good and balanced for such an old amplifier.
be sure to insulate the transformer from the chassis, maybe with a 1cm piece of wood under it, to reduce AC induced hum.
The amp tends to induce a AC hum to the ground plane when it's bolted onto the chassis.
best would probably be to add a netfilter, ring transformer and a snubber to the secundairy output to prevent high frequency noise and oscillation.

Me neither, but i will draw one, i got it fully repaired now and will soon map the entire circuit board in LTSpice.
Once done, i'll post it here.

Hi Disoluto,

the transformer is a 220~220 primary 40v single 12v single secundairy transformer, i suspect a 70 watts one, but it will get hot under normal use (70c), better to mount a 100w transformer to have some spare power so it runs a little cooler.

You could just take a 39~40v secundairy and use a small step down print to get 12v for the front light (cause that's what the 12v is for, it runs on AC the light), or you could get a higher voltage smal light so you dont need the 12v.

in my opinion a 220v Pri/ 40v Sec 4A wil be perfect. than you'll have 1,5A...

Hi there Francesc !

Can i ask you about the amp, i recently scored the same amp but can't find a circuit diagram for it,
and someone has been tinkering with it before and changed the bias pots for 2 totatally different values.
Since i can't find the circuit diagram i was wondering what value the originals should have been.

Do you by any change know what the value of these pots is, cause from the pics i can see they're still original.
Or would you be willing to pop the hood and measure them for me ?

you would do me a huge favor !
...

Hi there, i'm Marcurios, newbie on the forum..

Recently picked up repairing old Amplifiers again after a long hiatus.
So i scored a bunch of vintage amps for just about nothing.
And one in particulair gave me trouble since i can't find a schematic for it and wanted to verify some components.

So after googling a bit i found that someone in here has a old amp like that, which seems to be a very rare one, a Taiwanese Tele-Master AS-20.
So that mede me decide to join your club, and maybe who knows, we can help eachother out in the future !

Cheers...