Tube Amps / Music Electronics
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|8/29/1997 9:21 AM|
|R.G.||Re: Variable Power Supply|
The breadboarding setup sounds good. My favorite breadboarding setup is a variable power supply - I was fortunate enough to get a surplus HP variable high voltage one, with B+, filament, and bias outputs -, a mil-style turret strip for components mounted on standoffs, and surface mount relay sockets for the power tubes. I didn't have such a neato copper base. I just used a 2' x 2' piece of 1/2" plywood with some 0.032 aluminum glued to the top. This lets me just drill mounting holes for transformers, turret strip, outputs, etc., anywhere I want and run in hex head screws with the power driver to hold things in place. A piece of 2"x2"x 1/8" aluminum angle with 3/8" holes every 2" screwed down on one edge will hold all the controls I can think of.
Do try to get the turret strips for parts. That alone speeded up breadboarding by 500% for me. Keystone makes them. There was a discussion of turret and eyelet strip buying and making over on alt.guitar.amps a ways back. Look in deja news.
|9/2/1997 11:46 AM|
My breadboard:A transformer with lots of current capability. Dc ends up being 560v, then is reduced with pi filters and a 160v zener. The
voltages change with diff. circuits though
(except for the 160v zener usually). Any way
I don't do any soldering - all breadboard. for
the pots. and the tube sockets they sell, what I think are called terminal strips. They look
like bus strips, but have 35 - five conductor
points. These work sweet because I am a neatness
freak. I soldered wires from the tube socket
pin/potentiometer lug to the bottom of those
metal contact things. Sorry. This way allows
the wires that will always be there not to clutter
your view. I bent a piece of #20 steel into a
chassis with a hammer, a piece of angle iron,
and 2 clamps. The power supply is completely
covered and all soldered wiring is done here.
I think the time taken was worth it. it is very durable, not in risk of electric shock as much
and I can transport it to try out other cabs.
hope this helps. peace -eth
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