Princeton Reverb Circuits - AA1164 in a '75 PR?

coyoteblue · March 2nd, 2008, 01:47 PM

Anyone know if the AA1164 circuit was still around in 1975 Princeton Reverbs, ones with a GZ rectifier? Did the circuits change with the push-pull boost? Thanks.

PhatTele · March 2nd, 2008, 03:18 PM

The AA1164 circuit was used up until the push/pull models were introduced in the late 70s. However, they stopped using the GZ34 back in 1968 (SF drip edge models) and began shipping the amps with higher voltage power transformers and 5U4s. That continued throughout the 70s.

coyoteblue · March 2nd, 2008, 03:22 PM

Thanks for the info.

CaptainCat37 · March 2nd, 2008, 09:30 PM

I have a mid 70's silverface princeton reverb and it has the 5U4. Great recording amp.

eugenedunn · March 2nd, 2008, 11:45 PM

I have a 69 SFPR with the infamous AA764 tube chart in it..... my rectifier is a GZ

Tim Swartz · March 3rd, 2008, 09:24 AM

They also got an oscillation suppresor cap (.002uF?) on the reverb return around mid '68.

PhatTele · March 3rd, 2008, 11:18 AM

I sometimes clip that .002uF cap out and use it with a 220K resister as a treble bleed kit for my guitars. I've also reused some of those .047uF "death caps" coming off the ground switch as tone caps for my guitars as well. "Blackfacing" an amp can provide a wealth of reusable parts ;-)

March 2nd, 2008, 01:47 PM	#1 (permalink)
coyoteblue TDPRI Member Join Date: Feb 2005 Location: Toronto Posts: 74	Princeton Reverb Circuits - AA1164 in a '75 PR? Anyone know if the AA1164 circuit was still around in 1975 Princeton Reverbs, ones with a GZ rectifier? Did the circuits change with the push-pull boost? Thanks.

March 2nd, 2008, 11:45 PM	#5 (permalink)
eugenedunn Tele-Holic Join Date: Dec 2006 Location: Sacramento, CA Age: 55 Posts: 708 36 Photos	I have a 69 SFPR with the infamous AA764 tube chart in it..... my rectifier is a GZ __________________ Ono Boy says "good n' swampy....."

March 3rd, 2008, 09:24 AM	#6 (permalink)
Tim Swartz Tele-Afflicted Join Date: Mar 2003 Location: Michigan - Tweenst the Great Lakes Posts: 1,821	They also got an oscillation suppresor cap (.002uF?) on the reverb return around mid '68. __________________

March 2nd, 2008, 03:18 PM	#2 (permalink)
PhatTele Tele-Holic Join Date: Jun 2003 Location: Richmond, VA Posts: 706	The AA1164 circuit was used up until the push/pull models were introduced in the late 70s. However, they stopped using the GZ34 back in 1968 (SF drip edge models) and began shipping the amps with higher voltage power transformers and 5U4s. That continued throughout the 70s.

March 2nd, 2008, 03:22 PM	#3 (permalink)
coyoteblue TDPRI Member Join Date: Feb 2005 Location: Toronto Posts: 74	Thanks for the info.

March 2nd, 2008, 09:30 PM	#4 (permalink)
CaptainCat37 TDPRI Member Join Date: Feb 2008 Location: Texas Age: 37 Posts: 20	I have a mid 70's silverface princeton reverb and it has the 5U4. Great recording amp.

March 3rd, 2008, 11:18 AM	#7 (permalink)
PhatTele Tele-Holic Join Date: Jun 2003 Location: Richmond, VA Posts: 706	I sometimes clip that .002uF cap out and use it with a 220K resister as a treble bleed kit for my guitars. I've also reused some of those .047uF "death caps" coming off the ground switch as tone caps for my guitars as well. "Blackfacing" an amp can provide a wealth of reusable parts ;-)