Don't go poking into a tube amp without some training. There are voltages in there that can be fatal.
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Don't go poking into a tube amp without some training. There are voltages in there that can be fatal.
A poster just said that the baffle is to thin.
Why not:
1) have it serviced by a known tech whos reputation precedes him.
2) have some one make you a repro headcase and then use it on any cab.
It's your connection with your Dad. I am trying to help you avoid regretting messing this up.
It's like he gave you an old MG sports car and you went 4 wheeling with it or had it altered to be a 4x4. Then a year later you realize what you've done to a pristine piece your Dad kept for you. Really accepting the gift he gave you, accept he didn't give you a bass amp.
I'm bowing out of this. I know your path is yours. I regret selling some irreplaceable Lionel Trains to buy a Marshall head. Irreplaceable because my Dad bought them for me in 1954.
Peace, Bro.

keyofnight said:The same poster also said that other players remove and store the OG speakers to retain their collector's value, and they replace them with something modern they can play on. I agree that this seems like the most responsible thing to doI don't want to bust the OG speakers, but I'd love to play it.
The only difference is that I would put bass drivers in instead of reproduction Jensens. Of course, I was concerned with weight, but the neodymium speakers out there are a lot lighter than the repo Jensens, so they should be easier on the baffle anyway. (Celestion 12"s are 4.4lbs, Jensen C12Ns are 7.2lbs). I wouldn't be doing anything more than the responsible thing to do. If it came time to sell it or give it to my kids, I'd put the OG speakers back in.
I suppose I just don't see what I'd be messing up? I wouldn't change anything about the electronics beside basic repairs and maintenance, I won't change anything but the speakers (if that at allif I had money for a cab, I'd just sit-er on top of a good cab). I don't mean to upset you.![]()
Red Planet said:Oh my how I would feel if I opened the closet to see a Balckface Pro Reverb.

I owned a drip edge silverface pro reverb and played guitar through it. Fabulous amp. Move it along so it can be used by someone who can get its intended use out of it.
Sounds to me you should take it in and have it checked over by a competent amp technician. I highly recommend King Amplification over the hill in Los Gatos (next door to Keith Holland Guitars). They know this vintage stuff backwards and forwards and I use them to service my old Fender gear and they're very cool people.
Congrats on a beautiful find![]()
you mean a 12ax7 at the other end?The GZ34 tube is missing, and its socket was covered with a withering piece of masking tape. A quick Google search tells me that people pull that tube to get more gain.![]()


you mean a 12ax7 at the other end?
without the GZ34 it won't make any sound at all.
1. guitar frequencies need way less power than bass frequencies; my 50-watt marshall will blow your 300-watt SVT off the stage if i let it.A lot of things don't make sense to me now, and I'm admitting ignorance and defeat. I don't know: why guitarists can use low wattage amps but bassists cannot, how people did any gigs with older low-wattage amps (Ampeg B15 or Fender Bassman), how people still do gigs with low wattage amps (Ashdown Little Bastard comes to mind).