In Reply to: What makes a tube good or not good for A2 posted by RayP on March 25, 2015 at 15:49:07:
Higher Mu transmitter tubes. Eimac "TH" tubes, things like 809s. As Eli says they need to have a grid designed for substantial current. They are really hard to drive due to the current, but the Powerdrive works on these tubes as well, provided that you use bigger mosfets and heatsinks.
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Follow Ups
- There are tubes designed for A2 - Chip647 05:32:35 03/26/15 (0)