1970 Bassman head

Nice amp! All those white Mallory electrolytic caps are original. I am guessing the filters are too.

 

Yeah those white caps on the board would be original. Looks pretty untouched to me in general. I had a 69 Deluxe Reverb up until a couple of days ago that had a ton of little skinny wires, white included.

 

The cardboard outer casings on the filters do spin freely most of the time so that is not unusual. Nice amp, only thing Id touch are the filters and maybe a toasted resistor or two. Unless there is a compelling reason I'd leave all those coupling caps alone.

 

Get rid of the brown turd capacitors and it will sound 100% better. Also replace every electrolytic capacitor. Then "blackface" the output stage.

 

I appears to me that none of those caps are replaced. Those white Mallory coupling caps are originals. I love those early SF Bassman heads.
I have yet to decide if those brown turds sound any different than others myself. I think you may be hard pressed to tell.
It appears to be the AA270 circuit. I only see one thing replaced, the 470 ohm resistor on power tube 1. That's a common problem with Bassman's for some reason.
I once bought a non working Bassman dirt cheap, all that was wrong was a burnt apart 470 ohm resistor. Why it was problematic without that resistor I have no idea, it ought to still work. I would replace the other one with a metal oxide 2 watt etc.

 

If you get it for sure change the filter caps and bias cap, then play it before you do any other mods.
Also that amp may have the balance control instead of an actual bias control.
Fender did that sometime in the SF era.
The last couple of later SF amps that I owned I had them wired for bias and balance best of both worlds.
The Bassman heads are creeping up in value, a LOT of amp for the $ and they sound great!

 

I wouldn't automatically replace the brown caps in that era.

I'd bet replacing filters including the white Mallorys, a general spruce up would return it to good audio function.

Not everyone likes these for guitar - big and full like a Marshall but without the breakup.

You can get them cranking but that's freakin' loud. Many get hacked up with MVs etc

 

Can you take a pic of the filters, they're probably original if they have a cardboard casing around a solid aluminum cap. They're also dated. The other question is what is going on with the solder "pool" on lower part of the PT?... Do the leads coming from the PT solder joints look original? What is the SN# of the PT and the OT?

 

Man, that thing looks to be in pretty nice shape. Cool.

 

Ooooohh! Amp Porn!

 

I bet those tubes are good. Definitely keep em! That head is a really nice find. Get her going and enjoy!