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Goofing-around amplifier project

PostPosted: Sat Jul 09, 2016 10:02 pm
by Switch
So I already have too many projects going on right now...perfect time to add another.

I have a pair of hammond 1615 clones, built out of the remains of a pair I burned up due to stupidity. (Ignoring the DC current limit for a LONG time and by a LOT.)
I have piles of 12L6 and 12W6 tubes (Identical plate curves and typical op points, but the W's are rated for deflection duty)
I've got an aluminum chassis I folded and welded up and then realized was NOT 17" wide to fit the big radio project-it's 9.25"x14"x2.5"
An Antec 200V, 500mA toroid with 12.6V and 6.3V windings

And my first amplifier, from way back in high school, just shorted the power transformer a few weeks back.

Anyway, plan is 6BL8 pentode input/triode cathodyne, driving 12W6's in pentode class AB1. I've forgotten how to determine AB loadlines, so here's my drawings, complete with the erroneously marked Q-point.


If I wind up in class A, I wind up in class A. No big deal. AB will just use the OPT's more effectively.

Re: Goofing-around amplifier project

PostPosted: Sun Jul 10, 2016 4:35 pm
by Switch
Ok, so here's where I'm at now.





Total cost at this point: $0.57 for screws. All the rest was out of the "leftovers" pile.