Boyuurange / Reisong A50 300B Tube Amp Optional Mods

These last few optional mods include higher quality capacitors in the signal path, and improved reliability with a "right size" grid leak resistor and a grid stopper on the 300B. Finally, I relocated the cathode power resistors onto their own heat sinks, to improve the cooling.

I also do one final test of the amp on the audio analyzer suite, and you can see how great this turned out!

The angle aluminum needed for the heat sinks are two 3 1/4" long pieces of 1 1/4" X 1 1/4" X 3/16" 6061 stock.
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