1961 Fender Concert Amplifier

sunvalleylaw said:
And a good article on the amp from Premier Guitar: http://www.premierguitar.com/articles/Differences_in_Fender_Concert_4x10_Amps

Mine is the G612-A version described as follows:

The other version of the Concert during this period was produced between late 1960 and 1963. This version utilized the 6G12-A circuit. As with all of the Concerts during this time, it was also a two-channel amp, but the vibrato circuit had been substantially changed and now required the addition of another preamp tube. Looking at the schematic of this amp, it appears the greatest change to the vibrato circuitry is in the oscillator area of the circuit. This part of the circuit became much more simplified than its predecessor, and by the looks of it became the basis for the oscillator found in the popular opto-isolator version used today. While there indeed was another tube added to this new design, the tube was used to take the output of the oscillator circuit and produce two out-of-phase oscillator signals. These were then fed to the modulation part of the circuit, which would modulate the audio signal. The audio signal was split in order to feed two different amplifiers in the modulation circuit, but because the signal was split through different RC (resistor/ capacitor) networks, there was a slightly different signal being fed to each of the two amplifiers. Once combined together again, these slightly different signals being modulated by two out-of-phase oscillator signals provided the resulting pitch shifting aspect of this vibrato circuit. If you see six preamp tubes across the back of the amp, you have this 6G12-A version.
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Your amp actually has vibrato, not tremolo. Don't sell it.
 
Mercury Magnetics OT, '59 Bassman model. It was what was in it when I got it.
Merc.jpg
 
wagdog said:
Beautiful amp. Well outside my range for a purchase, but nice to look at.

I'd keep it. :)
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Thanks. So far, it looks like I am keeping it, as I have not had even any lowball offers, much less a reasonable offer. No matter. I am enjoying it while I wait.
 
generally speaking - a replaced transformer on a vintage amp is like a neck repair on a vintage guitar. It sets the value below the regular Reverb or Vintage Guitar Guide price.
 
Thanks for the input. And well, we shall see. There are lots of watchers, but no offers. The particular OT is a very well regarded 1959 Bassman style one. The selling price is what a willing buyer will pay and a willing seller will accept. This seller is not willing to sell the amp for any sort of bargain basement price. I would rather just keep it. It is a very nice amp. I am open to reasonable offers, just not lowball ones.
 
I am glad I didn’t sell this amp. :)

Working on swapping out some tubes, and improving its playability. Just a couple bad Pre-amp tubes and will replace those with something cool that match well with the old USA made that is in there. :bigg:
 
DO NOT SELL THIS AMP.

It’s completely acceptable to sell and churn easily replaceable things because yr bored with them or they fail to do their jobs. But things that are rare or where replacement will cost you kazillions more than keeping what you have...don’t do it.
 
Peen Simmons said:
DO NOT SELL THIS AMP.

It’s completely acceptable to sell and churn easily replaceable things because yr bored with them or they fail to do their jobs. But things that are rare or where replacement will cost you kazillions more than keeping what you have...don’t do it.
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Yeah, this was just a couple follow up posts indicating I was glad I made the decision not to, as urged by @Help!I'maRock! , @Chad , and others. I am currently getting some replacements for a couple problematic preamp section tubes and plan on using the amp more in a distant in the driveway project I hope to get going with other players. It had sat a while due to the nastily microphonic tube which created bad noises, before I finally got around to really figuring out how to diagnose it and address the issue.
 
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