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 Post subject: Gibson GA-45rvt Saturn
PostPosted: Mar Mon 20, 2017 1:04 am 
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Joined: Jan Sat 12, 2013 7:14 pm
Posts: 1142
Location: Plymouth, Michigan
I'm looking for a readable schematic for this dog! I found the regular 45rvt, and a really bad copy of the 45rvt Saturn but I can't see it well enough to tell if there are any differences, and Gibson was notorious I understand, for being a little loose with the documentation.
Anybody have anything on this?
Thanks!

Pete

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"Anything over six tubes seems excessive"
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 Post subject: Re: Gibson GA-45rvt Saturn
PostPosted: Mar Mon 20, 2017 4:34 pm 
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Joined: May Sat 06, 2006 4:03 am
Posts: 2661
Location: South of Richmond, VA 25 miles down the pike.
Will this help?
Bill J.

https://courses.physics.illinois.edu/ph ... report.pdf


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 Post subject: Re: Gibson GA-45rvt Saturn
PostPosted: Mar Mon 20, 2017 5:36 pm 
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Joined: Jan Sat 12, 2013 7:14 pm
Posts: 1142
Location: Plymouth, Michigan
Thanks Bill, I saw that one too. The schematic is the same GA-45RVT that I found. I guess there isn't that many differences. All I'm doing is a recap, and de-butchering the last guys efforts for a good friend of mine.
You don't see too many guitar amps with dual "firecracker" style filter capacitors, but that's what this one has which is consistent with other pictures I've seen. That young mans chassis picture in that file shows a can, chassis mounted cap which is the only picture I've seen with that in there. I've heard Gibson wasn't much on keeping up with engineering changes, and this amp proves it!
Thanks again,


Pete

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"Anything over six tubes seems excessive"
www.dazerdesign.com


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 Post subject: Re: Gibson GA-45rvt Saturn
PostPosted: Mar Mon 20, 2017 10:42 pm 
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Joined: May Sat 06, 2006 4:03 am
Posts: 2661
Location: South of Richmond, VA 25 miles down the pike.
He installed the two can electrolytics right? Something about punching holes. The pictures weren't clear enough for me to see wiring.
Bill J.


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 Post subject: Re: Gibson GA-45rvt Saturn
PostPosted: Apr Tue 25, 2017 9:50 am 
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Joined: Mar Wed 16, 2011 4:17 pm
Posts: 178
Location: New York City, New York
There is definitely another version of the GA-45-RVT schematic floating around. I cannot remember if it is in Aspen Pittman's book, the Master Service Guide, gibson.com, gibson garage, or the old "How to Service Guitar Amps" book. But it is definitely out there. The tone-stack is completely different in the 2 versions and going off memory there may actually be a few power supply differences but I'm not 100% sure on that.

The 4x10 1965-67 Epiphone schematic may match- it utilized the GA-45-RVT amp section. I believe that amp is one of the versions of an EA-12-RVT

Gibson wasn't "loose" with the schematics- the correct one almost always eventually shows up. The issue seems to be since less people are interested in them it takes much more time to share information.


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 Post subject: Re: Gibson GA-45rvt Saturn
PostPosted: Apr Tue 25, 2017 9:52 am 
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Joined: Mar Wed 16, 2011 4:17 pm
Posts: 178
Location: New York City, New York
NumberMaj 1 wrote:
He installed the two can electrolytics right? Something about punching holes. The pictures weren't clear enough for me to see wiring.
Bill J.


That is correct- Gibson did not use FP style caps on the White Panel amplifiers. There is plenty of room to neatly underwire in replacements. No need to resort to drilling 1.5" holes........


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