Still looking for a NOS R-4B panel....
I have a new set of R-4B audio mods coming that go one step further than the
Sherwood AMP-4 mod I recently made. I had FAR Circuits make several 4-watt
audio amp boards using a modified SM0VPO design. Ultra low-noise discrete
transistor design in the gain stage and a pair of TIP41 high-current
drivers. Uses a string of 1N914 diodes in a Darlington circuit to minimize
crossover distortion. I've been looking a very long time for an
audiophile-grade amp that runs from a single supply, delivers low
distortion, low noise, and will work equally well when driving a low-Z
speaker or headphones. Nearly all current designs require a +/- bi-polar
supply to achieve that objective.
Links to photos coming soon.
Paul, W9AC
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