RE: What makes a tube good or not good for A2

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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:

Look at the curves for a given tube, if the negative grid bias lines are all scrunched up and at obnoxiously low currents, then running some grid current will be necessary to move into the more linear portion of the curves.

This will also generally be accompanied by a G1 dissipation rating, which is a good indicator that grid current is acceptable.

The plate voltage on an 845 needs to be obscenely low (maybe 200V) to bias the tube in A2, which is probably a decent part of the reason that no grid current measurements are given.

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Follow Ups Full Thread

Topic - What makes a tube good or not good for A2 - RayP 15:49:07 03/25/15 (8)

RE: What makes a tube good or not good for A2 - Caucasian Blackplate 15:33:22 03/27/15 (0)

Which A2? - Triode_Kingdom 08:25:21 03/26/15 (2)

RE: Which A2? - RayP 09:45:03 03/26/15 (1)

RE: Which A2? - Triode_Kingdom 10:42:00 03/26/15 (0)

There are tubes designed for A2 - Chip647 05:32:35 03/26/15 (0)

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)

RE: What makes a tube good or not good for A2 - Al Noakes 16:19:41 03/25/15 (0)

Follow Ups

RE: What makes a tube good or not good for A2 - Caucasian Blackplate 15:33:22 03/27/15 (0)

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