65 Tremolux

tele71 · May 8th, 2004, 12:42 PM

I was thinking of buying one from one of my local dealers. But i'm curious, Whats the difference between the AA763 and the ab763 circuts. It sure sounds good and isn't as powerful as my Twin. Any advice is appreciated.
Paul

Wally · May 8th, 2004, 02:03 PM

The AB763 has a 1500 ohm resistor from pin 5 (control grid) on the power tubes to ground. The AA763 does not have this resistor.

See Tremo's post below...by bad error!

Tremo · May 8th, 2004, 04:37 PM

Quote:

Originally Posted by Wally

The AB763 has a 1500 ohm resistor from pin 5 (control grid) on the power tubes to ground. The AA763 does not have this resistor.

Uhhh....not quite, Wally. That 1500 ohm resistor is in series with the control grid, not to ground. It's called a swamp resistor, and it's to help with the amp's stability.

Wally · May 8th, 2004, 05:06 PM

Tremo, thanks for setting me straight. I knew something didn't seem right about that, but I didn't take a second look at the thing. where are my glasses? I guess I was hung up on the older circuits where the empty 1 pin ties to the 8 and to ground. I'll wake up sometime later. My apologies to all...

Skydog · May 8th, 2004, 05:49 PM

..fattest sounding of all BFs Imho.

May 8th, 2004, 12:42 PM	#1 (permalink)
tele71 Tele-Meister Join Date: Mar 2003 Location: Washington DC Posts: 169	65 Tremolux I was thinking of buying one from one of my local dealers. But i'm curious, Whats the difference between the AA763 and the ab763 circuts. It sure sounds good and isn't as powerful as my Twin. Any advice is appreciated. Paul

May 8th, 2004, 05:49 PM	#5 (permalink)
Skydog Tele-Meister Join Date: Mar 2003 Posts: 371	BF Tremolux creates a wall of sound . . . ..fattest sounding of all BFs Imho.

May 8th, 2004, 02:03 PM	#2 (permalink)
Wally Friend of Leo's Join Date: Mar 2003 Location: Lubbock, TX Posts: 4,212	The AB763 has a 1500 ohm resistor from pin 5 (control grid) on the power tubes to ground. The AA763 does not have this resistor. See Tremo's post below...by bad error!

May 8th, 2004, 05:06 PM	#4 (permalink)
Wally Friend of Leo's Join Date: Mar 2003 Location: Lubbock, TX Posts: 4,212	Tremo, thanks for setting me straight. I knew something didn't seem right about that, but I didn't take a second look at the thing. where are my glasses? I guess I was hung up on the older circuits where the empty 1 pin ties to the 8 and to ground. I'll wake up sometime later. My apologies to all...