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In this multi part video, we complete one channel doing the advanced modification of this amp. This is rewiring the front end 6SN7 driver to a cascode design to drive the 300B correctly.
The tubing I use in the video is: 1mm ID 2mm OD PTFE Tubing
The next video we will test these modifications and report back how this mod sounds vs the original design. I have plan for further mods to increase the reliability and some cooling issues I see.
After what I learned from mods to my personal DIY 300B build, this A50 should turn out sweet! I'm going to use a LED/resistor combo for bias on the cascode + add gridstopper resistors etc.
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