A Nelson Pass F4 would need even more!
The first pic is THD+N% vs output for a famous $27,500 solid state preamplifier. The second and third are a $16,500 preamplifier.
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Well, perhaps one fix -- I've figured a way to put a BUF634 within the tone-control loop. This will make the IC-150A much less load sensitive. Had some proto-type boards burned which piggyback a replacement for the LF356 (perhaps OPA627) and BUF634 on an elevator board. It's sized to fit in the space available within the IC-150A.
The IC-150A regulators are "adequate" but there's plenty of space to incorporate the super regulator boards available on the DIYAUDIO webstore. My son's IC-150A uses the original Old Colony super-reg boards.
The IC-150A regulators are "adequate" but there's plenty of space to incorporate the super regulator boards available on the DIYAUDIO webstore. My son's IC-150A uses the original Old Colony super-reg boards.
The IC-150A regulators are "adequate"
I hadn't seen that part number for a dual voltage regulator and was curious about it. It is an old EXAR dual voltage regulator. Probably unobtanium and way past the "best used by" date on that component.
I hadn't seen that part number for a dual voltage regulator and was curious about it. It is an old EXAR dual voltage regulator. Probably unobtanium and way past the "best used by" date on that component.
The IC-150A uses MC78L18 and MC79L18 regulators. The negative regulator was later upgraded to the metal can version.
By changing the values of the "Sense" resistors on the DIYAUDIO boards, from 1k/1k to 1.6k/1k you can get ~+/- 18 nice, quiet, low Z pillars.
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