Got an amp. Demo Beatles cover page 5

[øøøøøøø]

Doesn't hurt to replace it.

I'd replace anything that's off-spec or suspect in any way.

Value of the 4k7 isn't totally critical (and a bit high is probably better than a bit low in this particular case), but 5k6 would be the upper limit of a 20% tolerance part. I'd certainly replace it if it were mine

[Fiddy]

Guess how the power on test went...

(Suspense music)

[OffYourFace]

it made sound or it didn't haha

[Fiddy]

Well, i set the Variac at 12 volts..

The light didn't come on hahaha.. The tubes don't light up..

And no sound...

I get on the power tubes
Plate 44.5 volts
Screens Pin four 44.5 volts
Pin five negative 3.7 volts.

Ill take preamp readings soon...

[Fiddy]

No voltages on the resistors in the preamp section, but inputs shouldn't have right ?

[Fiddy]

Edit

Fuck ,i need to brush up on some amp stuff and basic electronics . So rusty..

[OffYourFace]

you need more than 12v. bump it up to at least 60-75v

[Fiddy]

Works!

A little hum that should go away after a recap. Sounds pretty awesome too.

[Fiddy]

Being that it works, this makes this, one of my nicest scores. The pots date it to 1966.

[OffYourFace]

damn, i thought they were from the 70s but I have no idea. how much was it? I've always been curious about these... the Canadian Marshall.

[Fiddy]

$500 but it looked like shit when i picked it up, and I almost considered not getting it... I thought it was a newer model too, less rare.

It cleaned up pretty good, but I want to get some vinyl restorer though, to make the cab spit shiny.

[sal paradise]

Nice, glad it’s working for you!

Had a listen to some of these on YouTube- matt likes.

And yet again, another thread to inspire my foray into pedal/amp building!

[OffYourFace]

cool, congrats! I got myself a '66-67 Bassman head recently and converted it to AA864 specs but modded the bass channel to suite guitar better. It got me back into amps after 5-6 years of not doing anything amp-related.

[Fiddy]

Thanks, it worked out better than I had hoped for... Original tubes too. That's kinda neat, usually everything comes with JJs these days..

Now, I just have to order me some caps..

[terminalvertigo]

Nice save Homie!