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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: Riddle me this posted by 1973shovel on July 10, 2021 at 04:45:24:
Yes, my mistake. Substituting a 6L6 type for the EL34 is indeed possible. It's the other scenario that's different and more difficult.
One thing that concerns me about all this is the screen rating of the 6P3S-E. Within the 6L6 family, only the 6L6GC is rated to withstand more than 400V on the screen. Many 6L6 types are rated 300V or less. It's apparent the 6P3S-E isn't the equivalent of the 6L6GC in terms of anode dissipation, and that raises the question of what the maximum screen voltage and dissipation might be. No one really seems to know, and the Russian data sheet, which shows a maximum of 250V on the anode, is no help.
I'm aware that many owners have installed the 6P3S-E in their ST-70, presumably without immediate failure. However, there are reports of the sound changing over a period of 50 or 100 hours, and that's a concern. What's happening in these tubes to cause that? Could it be some aspect of screen or anode integrity? No one seems to have made even the most fundamental electrical measurements, such as output power, so there's really no way to know.
My current project will use the 6P3S-E with more than 400V on the anodes. However, screens will be regulated down to about 300V. I don't know if this is absolutely necessary, but it will at least provide peace of mind and the ability to use most 6L6 types in the future.
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Follow Ups
- RE: Riddle me this - Triode_Kingdom 10:45:02 07/10/21 (1)
- RE: Riddle me this - 1973shovel 08:56:52 07/11/21 (0)
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