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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Can the 27 or 56 be uesed in SRPP circuit to drive 45's? posted by Docgab on April 10, 2003 at 13:16:21:
. . . the voltage on the upper tube's cathode will exceed the cathode/heater voltage rating of either a 27 or 56, which, IIRC, is 45 volts. You'd risk an arc-over. Rather than a 27 or 56, I'd load the lower tube with a pentode like a 6AU8 or even a 6BQ5 configured as a CCS. Of course 27's or 56's filaments run at 2.5V, so you'd need a 6.3V winding. But the results will be well worth the effort.
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