This tube power amp is a great performer at a decent price.
Freed made some really excellent power transformers, now quite rare. I've attached a .pdf spec sheet of their KA-10 power amp XFMR - incredibly linear.
This Williamson power amplifier uses a pair of Freed KA-10 OPTs and Russian 6P3S-E output tubes (6L6GC). . I have attached schematics of the power supply as well as the amplifier stage.
The amp incorporates Dave Gillespie's EFB™ bias circuit, to maximize performance and tube life. Better than that, this amp was tested by the Guru himself.
Features include individual bias and balance pots for the output tubes, so a perfectly matched pair / quad (while advisable) isn't absolutely necessary. There are test probe sockets on the top to make checking the cathode current of each power tube easy. All of the labels are laser-etched for durability. Among the pics is one showing the rear connections of the amp, and the vented bottom panel.
The amp produces a measured 25W RMS/channel with a 1.0V input, with frequency response flat to 20 kHz, down 1.0 db at 50 kHz.
I'm thinning the herd, and so I am selling this at a fraction of what all of the time & materials cost and / or are worth.
Price drop to $750 (plus shipping, if applicable).
Jon
Freed made some really excellent power transformers, now quite rare. I've attached a .pdf spec sheet of their KA-10 power amp XFMR - incredibly linear.
This Williamson power amplifier uses a pair of Freed KA-10 OPTs and Russian 6P3S-E output tubes (6L6GC). . I have attached schematics of the power supply as well as the amplifier stage.
The amp incorporates Dave Gillespie's EFB™ bias circuit, to maximize performance and tube life. Better than that, this amp was tested by the Guru himself.
Features include individual bias and balance pots for the output tubes, so a perfectly matched pair / quad (while advisable) isn't absolutely necessary. There are test probe sockets on the top to make checking the cathode current of each power tube easy. All of the labels are laser-etched for durability. Among the pics is one showing the rear connections of the amp, and the vented bottom panel.
The amp produces a measured 25W RMS/channel with a 1.0V input, with frequency response flat to 20 kHz, down 1.0 db at 50 kHz.
I'm thinning the herd, and so I am selling this at a fraction of what all of the time & materials cost and / or are worth.
Price drop to $750 (plus shipping, if applicable).
Jon
