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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: EL37/KT66/6L6GC or not posted by mak on February 21, 2001 at 00:28:47:
In general, a tube can be safely substituted by one with higher plate current and lower filament current, electrically. The data of 6L6GC/EL37/KT66 are as follows:-(Max plate voltage/filament current)
400V/0.9A
400V/1.4A
600V/1.4A
Whether you wish to add extra filament transformer when changing from 6L6GC to KT66 or EL37, your own choice. Someone suggested that a CRO could check the overloading but I would say the temperature rise test of the PT filament output would govern how much current you can draw, without exceeding the design limit. Such heat run test is valid for all electrical equipment and the temperature can be measured by change of resistance method or RTD(resistance temperature detector)embedded inside the winding(for large machine or transformer, of course)The data sheet usually indicated the anode to cathode voltage whilst the schematic usually represented the voltage to ground. So, don't mix them up. In this case, KT66 can be safely used with respect to plate voltage.
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Follow Ups
- Can be a long debating question-See Mcintosh 240 - koo 05:54:08 02/21/01 (1)
- KT66 500V/1.3A, sorry for wrong typo. - koo 05:59:36 02/21/01 (0)
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