Pair of 813s
amplifier was made using an old HT-41 Hallicrafters Amplifier.
The original tubes became hard to find and expensive, so I converted
them to 813s.
Also, the original Power Supply was shot, so I built an external PS and
Solid State Rectifiers to match the new tubes.
The original HT-41 covered 80 - 10 Meters, so I added the 160 band to