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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 4th April 2013, 04:13 PM   #31
GoatGuy is online now GoatGuy  United States
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Join Date: Dec 2012
Location: SF Bay Area

Regarding "interchangeable bias resistors" (and a switch, or not)... here's one idea I had that has worked really well over the years: RCA jack ... in the place of the resistor. With a little creative soldering, you can make interchangeable plugs ... with a variety of resistance values ... and then its easy to just "shut down the amp, swap resistors, and power it back up". Alternately (and somewhat more double-safe) would be using quarter-inch jacks. In one case, I used "tip-jacks" of the smallest variety (1 millimeter openings), as a pair so that the bias resistor could simply be an external-to-case device. Bend the legs at just the right spot, and again you can neatly and conveniently swap bias resistors any time you like. Get gold-plated jacks, of course.

PS: This also makes it easy (if not trivial) to do "LED biasing" on preamp and line level amplification stages. With no hassle at all, one can swap substitutes in ... in seconds ... and immediately hear the consequence of switching. My friend C implemented a double version of this: DPDT (double pole, double throw) switch, and 2 quarter-inch sockets, so that a pair of values could be SWITCHED while the circuit was hot (sure, a pop was always heard, but the immediacy of the change allowed one to hear it "live with real tracks playing"). An excellent method - if you're as attracted to the art of trying things as Mr. C.

The circuit couldn't be simpler... (the "plugs" can be made pretty complex too - both resistor and bypass capacitor (but the 2nd one without the cap) to see the difference)

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Old 7th April 2013, 07:14 PM   #32
jrn77478 is offline jrn77478  United States
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Originally Posted by the trooper View Post
Thank you for the compliment, I used a table saw for the recess and just mitered the corners. Blade must have some varnish build up. The top plate is from online metals. I would wait to have the metal on hand befor making any cuts, they only guaranty size to + or - 1/8"
Hah! I must have missed that little detail when I ordered mine. It was "close", but it took some work with the belt sander to get that panel squared up.
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Old 11th April 2013, 12:37 AM   #33
the trooper is offline the trooper  United States
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SSE is running! Sounds awesome! There is enough iron mounted on top this thing to make a half dozen smart cars. I put this together in a basic configuration, I will be adding a aux cap soon. I most say the volume is quite satisfying, which I was alittle worried about. I will post pictures soon.
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Old 11th April 2013, 07:10 AM   #34
gthang is offline gthang  United Kingdom
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Congratulations! will look forward to seeing some pictures.
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Old 11th April 2013, 11:49 AM   #35
rock12 is offline rock12  United States
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Location: midland mi
looking to make new speakers what are you using
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Old 11th April 2013, 10:42 PM   #36
the trooper is offline the trooper  United States
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Default speakers

Im using diy speakers, I found the plans online. All the drivers are from dayton. Curly maple fronts, Probly not very efficient but they sound pretty good to my ears. Posting amp pictures in the photo thread
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