![]() ![]() I also rebuilt the bias supply with a 1N4007 diode and a 220 Ω resistor to bring bias to exactly -150.0V when the B+ was 435 V, and replaced the original 12 ♟ electrolytic with a 12 ♟ 250V film capacitor. While I had it open, I replaced all four 12 kΩ 2W resistors, as well as replaced all four major power supply capacitors. It turns out that all it needed to meet factory specifications was a new set of inexpensive Russian Tung-Sol tubes from TubeDepot (only about $200 total) and one bad resistor replaced, a 17¢ part. As it arrived, it already sounded out of this world. ![]() My renovation work is to bring this amplifier back into original specifications. The amazing thing is that the old one I got with tubes that dated as far back as 1961 certainly didn't meet its specifications, but for actually enjoying music sounded absolutely spectacular. October 2021 audio reviews tube reviews all reviews Buy only from the approved sources I use myself for the best prices, service, return policies and selection. This ad-free website's biggest source of support is when you use those or any of these links to approved sources when you get anything, regardless of the country in which you live. I got mine at this link directly to them at eBay (see How to Win at eBay). McIntosh MC240 (rated 40 watts per channel, 56 pounds/25.4 kg, measured 145 watts idle power draw, about $2,400 used). ![]()
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