#1
I was searching online, but I couldn't find any tube rectifier mods for the Blues Jr.
So, I was wondering if anyone (namely Powerfreak or Pink, but anyone else's input is welcome) had any suggestions on a tube rectifier mod for a Fender Blues Jr.

I'm pretty certain I can run leads from the power tubes for the heater fils, I'd have to mount a rectifier tube socket. Circuit-wise, it shouldn't be TOO complicated of a mod (for me anyways). I'd just have to splice out the current SS rectifier, possibly drill holes in the PCB, and run leads to the tube socket (or trace and run leads directly from the power transformer, which would be alot better), then run one more lead to the rest of the circuit. I'm not quite sure what tube rectifier to use however, I'm gonna have to start looking at data sheets. I'm thinking something along the lines of a 6CA4 (sticking with the 9pin tubes for a blues jr)

Reasons for modding:
1) My audiofile-nut friend suggested it to me
2) A Fender Blues Jr. doesn't have a standby switch (although I'm not sure how much of a consequence this is)
3) I'm bored.

Here's a link to a site with the schematic:
http://blueguitar.org/schems.htm

Here's the schematic:
http://www.blueguitar.org/new/schem/fender/blues_jr.gif


UPDATE:
I found this
http://www.torresengineering.com/bluesjrbouta.html
but $550 is a bit to rich for my blood. Plus I wanted to do it myself. Although... now I wanna see if I can't add in a tube reverb driver. And apparantly, it runs in AB, I wonder if I can't also mod it to run in class A... (which I have no idea how to do, well, I might have a small idea).
#2
IMO the whole class A, A/B whatever stuff is just hype. Just leave that alone.

I think a 5y3 rectifier would work well for you, thats what was in the old tweed era Fenders.

Heres a basic idea for some 5y3 wiring:
I'm not very active here on UG currently.
I'm a retired Supermod off to the greener pastures of the real world.
#3
yeah, I actually wired a 5y3 in my fender champ. The only problem is whether or not I want a large tube socket or a small tube socket (I might be tight on space in the blues jr chassis, though I haven't checked yet).

The reason I wanted 6CA4 is because they're 9pin (and smaller), and use fil voltages of 6.3 volts (5y3 is at 5v), that way I should just be able to run leads from the power tubes for the fils, just in case the power transformer didn't have 5v lines.
#4
^Good thinking on the filament voltage...nice. It's probable IMO that Fender just chops off the extra leads(5volt) or just orders cheaper tranformers with fewer taps. Sounds like the other tube is the way to go then.
I'm not very active here on UG currently.
I'm a retired Supermod off to the greener pastures of the real world.