I happened upon a video of a gentleman playing a (real) '57 Goldtop with P90s into what turns out to be a '63 Bassman. Very little of the amp was visible in the video, but I'm pretty sure it's a head on top of a 2x12. After some inquiry, the reply I got about the amp was "1963 Fender Bassman. Transitional model with smooth white tolex, with raised logo and Blackface (versus Brownface) control panel". The tone was amazing; very piano-like with a bouncy, clear, chimey, and percussive attack Am I correct to assume this is the 6G6-A or B circuit?
Blonde 6G6.jpg
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I have worked on , played and heard a bunch of these SS rectified Bassmans of that year and the ones that had or still have there original RCA output tubes and came with Jensen C12n Drivers and not the Oxford Drivers sound far better as you open up the amp!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
nice amps but its even better to build a new one. I recommend
- a mid controll, e.g. 100kA pot
- removing or decreasing the 470k mixer resistor
- decreasing cap values somewhat for tighter bass.
Roe wrote: ↑Sat Sep 28, 2019 4:30 pm
nice amps but its even better to build a new one. I recommend
- a mid controll, e.g. 100kA pot
- removing or decreasing the 470k mixer resistor
- decreasing cap values somewhat for tighter bass.
Hi Roe,
I agree. This would be a nice project. The amp with that Les Paul sounded bubbly and very musical! I would likely just make it a single Normal channel only, no Bass channel. For the mid control, you suggest 100kA? Would you do this Dumble style? Or did you mean 10kA to replace the 6k8 mid resistor?
How about adding a one-tube reverb circuit? Maybe insert it just after the tone stack and returning after the second stage? or insert it after the second stage and mix back in before the PI?
I did the same thing when I built a single channel Deluxe for my cabinet guy added middle pot a 100KA because he likes more mids and that was the value David Allen used in one of his amps.
Roe wrote: ↑Sat Sep 28, 2019 4:30 pm
nice amps but its even better to build a new one. I recommend
- a mid controll, e.g. 100kA pot
- removing or decreasing the 470k mixer resistor
- decreasing cap values somewhat for tighter bass.
Hi Roe,
I agree. This would be a nice project. The amp with that Les Paul sounded bubbly and very musical! I would likely just make it a single Normal channel only, no Bass channel. For the mid control, you suggest 100kA? Would you do this Dumble style? Or did you mean 10kA to replace the 6k8 mid resistor?
How about adding a one-tube reverb circuit? Maybe insert it just after the tone stack and returning after the second stage? or insert it after the second stage and mix back in before the PI?
I mean a 100k audio pot instead of the 6.8k resistor. I prefer to add reverb and delay after the amp, using either a fryette power station or adding it during mixing in the studio.
As for cap values, I think 2.2uf on the first gainstage cathode is enough for guitar. on the second gainstage 2.2uf also seems to work well. However, the 500pf coupling cap could be increased to 1000 or 1500pf, whereas the .1uf in the phase inverter could be decreased to .022uf or .033uf
If you going to spend the time to add a mid pot to the tone circuit then I would build a tone circuit that lets you boost the Mids, and not just cut them as the shock Fender mid pot does in there tone curcuit.
The only way to get a mid boost out of the stock 2 knob tone circuit is to crank up the volume and turn down the bass and treble to very low levels!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Roe wrote: ↑Mon Sep 30, 2019 7:53 am
I mean a 100k audio pot instead of the 6.8k resistor. I prefer to add reverb and delay after the amp, using either a fryette power station or adding it during mixing in the studio.
As for cap values, I think 2.2uf on the first gainstage cathode is enough for guitar. on the second gainstage 2.2uf also seems to work well. However, the 500pf coupling cap could be increased to 1000 or 1500pf, whereas the .1uf in the phase inverter could be decreased to .022uf or .033uf
Thanks Roe. So a 100kA would act as a Tone Stack Lift if replacing the 6k8 mid resistor. I agree on the lower bypass cap values; plenty of bass. I prefer to keep the notes defined and punchy, not flubby or bloated.
Very nice 6G6A, Mark! What a great find at a great price.
Am I correct to assume this is the 6G6-A or B circuit?
