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In Reply to: you send the eye candy... I'll send the tees posted by mqracing on March 28, 2005 at 11:39:52:
Here's my headphone amp. Dual mono MQ PGP 8.1s thru ultrafast snubbered rectifiers into a LC filter using MQ EXO-03s as filter chokes to scrub off a few volts and cream any ripple. DC heater supply with schottky diodes and filament chokes. 6C45pi with C4S loaded triode wired Mullard 6BQ5 hybrid shunt reg and C4S plate load, ultra cool WE style negative rail bias. MQ TL404 output autoformers and custom potted Jupiter beeswax parafeed coupling caps. Daven coarse and fine 600 ohm attentuators with extended precision ground 303 stainless shafts in rulon bushings, 4:1 stepdown input transformers for 26dB headroom, balanced input with phase switching and ground lift. Single point ground. Electroswitch rotary and toggle switches, vintage Dakaware knobs, copper vein powder coated Bud rack chassis, Switchcraft XLRs, Neutrik headphone jack.
Follow Ups:
That is one heck of a nice layout!
Thanks Jeff. The vertical bulkheads of that huge, modular Bud rack box make for the potential to cram a lot more inside. At 35lbs. we have a pretty good Dunker factor going, about 10lb./watt. That was one of the toughest projects to let go. It's now employed at Paul Stubblebine Mastering. Here it is with several MQ equipped amps (3 x PP300B with MQ Peerless S-240-A, 1 x parafeed SE45 with EXO-45, BCP-15 and PGP8.1) that were built by John Tucker and subsquently modified by PJ, Paul and myself.
Impressive would be an understatement!How did you like the 300B PP amps? I'm tempted to build one with my pair of S-240-A that are actually in the Seth. I am now stuck with a rather large listening room and the 7W from a Class A 2A3PP amp is borderline.
Did you use a self bias scheme or an adjustable bias?
What's the lacewood chassis with the big aluminium heat sink on the first shelve?
Book matched lace wood veneer over 2mm alu.
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