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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: opinions wanted on CBS-Hytron 5692 posted by Jim McShane on March 9, 2006 at 07:16:20:
Len's points are still valid. Though it's true that red bases perform higher than that for which they are rated.
From Dennis Boyle of Chimera Labs:
"Various 6SN7 types have different voltage and plate dissipation ratings. The voltage rating refers to voltage across the tube's plate and cathode. To ensure good tube reliability you should probably run a tube at 70% or less of its maximum plate dissipation.5692 - 275 Volts maximum & maximum 1.75 Watts per section
6SN7GT/WGT -- 300 Volts maximum & maximum 3.5 Watts per section
6SN7GTA/GTB - 450 Volts maximum & maximum 5.0 Watts per section
Using the general audio application of 250 plate volts, a bias of 8 volts results in 9ma of current and a plate dissipation of 2.25 Watts, we find:5692 - runs 43 % over maximum rating – It isn’t a 10,000 hour tube when you run it this HOT!
6SN7GT - runs 64% of maximum – coasting and liking it
6SN7GTA/GTB - runs 45% of maximum – Hardly turned on, may outlast you.When in doubt check with the manufacturer of your equipment. If they provide a schematic with component values and voltages, it's easy to use Ohm’s law to calculate the current and dissipation. There really is no reason for manufacturers not to provide this information."
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Follow Ups
- A "red base" is more robust than it needs to be. A CBS-Hytron 5692 only as robust as it needs to be. Again, YMMV. - Nietzschelover 08:05:28 03/09/06 (3)
- Re: A "red base" is more robust than it needs to be. A CBS-Hytron 5692 only as robust as it needs to be. Again, YMMV. - Jim McShane 08:22:21 03/09/06 (1)
- Re: A "red base" is more robust than it needs to be. A CBS-Hytron 5692 only as robust as it needs to be. Again, YMMV. - Nietzschelover 09:15:50 03/09/06 (0)
- Re: A "red base" is more robust than it needs to be. A CBS-Hytron 5692 only as robust as it needs to be. Again, YMMV. - Len_ 08:20:36 03/09/06 (0)
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