The best way is to mod yourself eliminating the vibrato in the ab763 circuit which is fender's only true known flaw after the tweed era when eliminated two extra tubes that controlled the vibrato. It created extra noise in the pursuit of the the ultimate cleanliness and actually added great improvements in tonal response,harmonics,sustain and sparkle with way more clean headroom.
I saw a post here from a guy named Dan at FYD amps who appears to have used possible the AT7 tube to control true spring reverb pan but I'm he doesn't include tremolo due to the above fact. The shunted out tremolo jack is actually an amazing design I saw at wald electronics and have done myself. It also renders the rest of the amplification section dead of the circuit which now can be sent as the cleanest preamp signal sought out by thousands. I believe only the twin reverb and the blues junior from the ab763 use the cleanest voicing of the ab763 era.
There once was a hughes and kettner in the 90's called the blues master and in europe called the crunchmaster(very hard to find) which use similar voicing but used no reverb the guy in this vid has a nano verb ontop I believe.
Hughes and Kettner Blues Master 2 Then sent out to a class A hifi stereo system like the McIntosh mc2100 and the mc2300 which are mono bridgeable. I built my own out of a conjunction of information with NOS RCA 7025's and an AT7 to handle my real fender spring tank and preamped out to my mcIntosh 2100 with an upgraded pair of 59000uf cans bigger than a king can of beer and bridged with a 2ohm tap fueling a custom built russian birch cab with 3 8ohm jbl e-120's. I'm not sure how FYD amps does it but by the Mercury magnetics transformer and mentioned ground lift it looks like the sweetest yet and hand wired. There's also sarnomusicsolutions who build a similar pre but they use a cheap set of 12ax7's,cheap transformer, and a solid state hall reverb.
I think the user loosechange here on this forum has the cream of the pop. I'd love to hear it in action especially with the signal out to a modded McIntosh into the best of the best JBL's.
Good topic though because the tremolo on the AB763 is where they cheaped out.
Hoffman you should make the ultimate pre amp with all this array of info. I bet your would be on top. let the others do the amplification and get away from the combo for a version.
Scroll down to post alembicization mods here.
http://www.wald-electronics.com/preampmods.html Saweeeet
Topic: AB763 without Vibrato? (Read 8179 times)