Power Amplifiers

Threshold SA/4e, 350e, S500 w/optical bias and a sweet Jon Soderberg upgraded SA/3.

I’m using 2 mono-block tube amps I built from schematics published in 1958, from books my father had and was going to throw away. Switch Mode Power Supplies. Modern passive components. All RCA tubes. The finest amps I’ve heard. Class A 45 Watts/channel. Tube phono preamps.

The only heat comes from the filaments. Granite bases.

@richopp I think you are in the 80’s with a Hafler 500
gr8 amp

1961 MC240 in my Vintage system...

rebuilt twice now....

sings w Quad ESL63

Sold 75 % of my amp collection within the last 3 years, but still have a dozen or so lying around, all being occasionally rotated in and out, most of them tweaked up a bit. ADA, Soundcraftsmen, Hafler, GAS, Yamaha Pro, Citation, Adcom, Nuforce ( STA200 )...........