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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: 7189 and 6BQ5 - Plate Voltage and Dissipation posted by TubeAcolyte on July 29, 2016 at 13:58:08:
If arcing does not occur, voltage (potential difference) is of little consequence. What really matters is power dissipation by the plate and, especially, the screen grid. Fundamentally, power is defined as I2R, but it can be expressed, via Ohm's Law, in other terms.Exceeding power dissipation limits, not mere volts, is what wrecks tubes.
See my remark about OS tubes labeled 6BQ5 being "truly" 7189.
You are making an "apples and oranges" error in comparing 7189A to 7189. The GE 7189A datasheet uses the Design Maximum system, while the TungSol 7189 datasheet uses the Design Center system. Increase Design Center numbers by approx. 10% to get their Design Maximum equivalents.
Fact, the current production EL84M, which is really Russian 6p14p-ev, is both very tough and good sounding. Perhaps the SCARCE and costly NOS is slightly better, but the reasonable price of well performing current production tubes (IMO) ends the discussion.
Eli D.
Edits: 08/03/16
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Follow Ups
- RE: 7189 and 6BQ5 - Plate Voltage and Dissipation - Eli Duttman 10:32:17 08/03/16 (1)
- RE: 7189 and 6BQ5 - Plate Voltage and Dissipation - Jim McShane 14:22:32 08/03/16 (0)
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