It is currently Mon Mar 16, 2020 6:44 pm

All times are UTC - 7 hours



Post new topic Reply to topic  [ 6 posts ] 
Author Message
Post subject: Biasing a '74 Super Reverb
Posted: Sun Apr 03, 2011 6:02 pm
Offline
Hobbyist
Hobbyist

Joined: Wed Sep 29, 2010 6:04 pm
Posts: 10
Hi, i own a 1974 Super Reverb Silverface wich i intend to bias because im changing the tubes soon, i heard that i need some type of layout or map in order for me or the technician to take the right steps or route, i really dont understand much about the biasing but if anybody out there can give me a hand i would appreciate it!!!


Jorge
Santiago, Dominican Republic


Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: Biasing a '74 Super Reverb
Posted: Sun Apr 03, 2011 6:05 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
You'll find most of the available schematics for the various Super Reverb amps here......

http://web.archive.org/web/200807170341 ... fender.htm

Best of luck!

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject: Re: Biasing a '74 Super Reverb
Posted: Sun Apr 03, 2011 6:19 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Arjay, may not be as simple. If his SR has a AA270 or AA1069 circuit. The only adjusting pot is for hum balance:

http://www.ampwares.com/schematics/supe ... _aa270.pdf

http://www.ampwares.com/schematics/supe ... aa1069.pdf

He may need to add bias pot. Or revert this part of the circuit (bias power supply) back to AA or AB763:

http://www.ampwares.com/schematics/supe ... _aa763.pdf


Top
Profile
Post subject: Re: Biasing a '74 Super Reverb
Posted: Sun Apr 03, 2011 6:25 pm
Offline
Hobbyist
Hobbyist

Joined: Wed Sep 29, 2010 6:04 pm
Posts: 10
Thanks guys for the prompt answer!

So, where can i find this circuit model? I mean how do i know wich type of circuit board is it


Top
Profile
Post subject: Re: Biasing a '74 Super Reverb
Posted: Sun Apr 03, 2011 6:30 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Check out this link. It's for a SF Twin with same issue. The plan should work for your SF SR.

http://www.diyguitarist.com/GuitarAmps/TR-BiasMod.htm


Top
Profile
Post subject: Re: Biasing a '74 Super Reverb
Posted: Sun Apr 03, 2011 7:37 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Tue Jun 29, 2010 1:20 pm
Posts: 9640
Location: Indiana
Is the circuit listed at the top of the tube chart in the amp?

_________________
---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: