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In Reply to: RE: 7189 and 6BQ5 - Plate Voltage and Dissipation posted by Eli Duttman on August 3, 2016 at 10:32:17:
Exactly! You cannot compare tube specs unless you know what rating system was used:
1. Design-center - the most conservative and most commonly used; the most tube-friendly of the three systems
2. Design-maximum - middle level, but needs to be heeded. Look at the specs for a 7591A for instance, they are design-maximum specs on the excellent Tung-Sol datasheet.
3. Absolute-maximum - rarely used, but I can promise you that running a tube close to the absolute maximum is almost always going to be trouble.
Also, the JJ EL84s are pretty stout tubes! They certainly have not trouble with 400 volts and they seem to work well and survive (I'm not a JJ fan, but this is a good tube!) though nothing approaches the EL-84M/6p14p-EV for ability to take a pounding. It is every bit as durable as any NOS IMHO.
So there are indeed current production tubes that are quite happy at 400 plus volts.
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- RE: 7189 and 6BQ5 - Plate Voltage and Dissipation - Jim McShane 14:22:32 08/03/16 (0)