kirschke Posted December 14, 2003 Share Posted December 14, 2003 Hello Myles, I have an old Japanese LUXOR amp which takes the bias from the 330V of the PT through a 100K re- sistor,a diode and a 26K to ground .I would like to add a bias pot to adjust the bias better when changing tubes.Adding a 25K lin pot?Reducing the 100K resistor? Thanks Wolfgang Link to comment Share on other sites More sharing options...
Caevan O’Shite Posted December 14, 2003 Share Posted December 14, 2003 You should copy-'n'-paste this post onto the "Feel free to ask Myles" thread here on this Forum, kirschke. For what it's worth, I'll recommend a few good books to ya... ...Check out the following excellent books: * How To Service Your Own Tube Amp, by Tom Mitchell. (Media Concepts, Norwalk, CA) It can be bought with a companion video- highly recommended. Includes some very useful troubleshooting "flow-charts", mods and tweaking, some schematics, and a lot of useful reference info not always found elsewhere. * Inside Tube Amps, by Dan Torres. (Sparpco, Inc. San Mateo, CA) Loads of deep amp info... more than you'll ever use! *(This one has specific info on bias supply work.)* Includes a step-by-step "build a tube amp from scratch" section that could be a book by itself, and lots of ideas for mods and tweaking. Schematics? The whole damn book is schematics! * A Desktop Reference of Hip Vintage Guitar Amps, by Gerald Weber. (Kendrick Books, Pflugerville, TX) Some cool tips and tricks for a variety of tweed and backface favorites, and a lot more. Some sections written by some celebrated amp experts. Lots of schematics. * The Tube Amp Book, by Aspen Pittman, of Groove Tubes. Has input from our own Myles Rose, among others! Lots of schematics and great info, not to mention drool-inducing pics of... amps! And some guitars, too! Here's a cluster of links that might prove useful, too: http://www.schematicheaven.com http://www.ampage.org http://www.mouser.com http://www.stf-electronics.com http://www.ampwares.com/ffg/index.html (Thanks to bluestrat for the links there!) Ask yourself- What Would Ren and Stimpy Do? ~ Caevan James-Michael Miller-O'Shite ~ _ ___ _ Leprechaun, Esquire _ ___ _ Link to comment Share on other sites More sharing options...
strat0124 Posted December 16, 2003 Share Posted December 16, 2003 Without seeing the circuit, I'd be hard pressed to give you a definitive answer. How many power tubes? Down like a dollar comin up against a yen, doin pretty good for the shape I'm in Link to comment Share on other sites More sharing options...
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