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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: What makes a tube good or not good for A2 posted by RayP on March 25, 2015 at 15:49:07:
The control grid has to be able to dissipate some power. Quite a few types will fail in a positive grid current regime.
Among multi-grid types, the 6L6 family and the KT88 are specifically rated for positive grid current. Some popular DHTs are OK too.
Don't forget that the driver has to be low O/P impedance and capable of delivering power, not just a waveform. Historically, cathode followers DC coupled to g1 or step down interstage trafos have been used. Tubelab's PowerDrive, which uses MOSFETs, is the "modern" way and enjoys an excellent reputation.
Eli D.
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Follow Ups
- RE: What makes a tube good or not good for A2 - Eli Duttman 17:56:53 03/25/15 (1)
- Powerdrive - RayP 19:46:14 03/25/15 (0)
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