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Audio and Video Talk
Valves / Vacuum Tubes
SCC88/PCC88 heaters in series?
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<blockquote data-quote="handsome" data-source="post: 1096100" data-attributes="member: 772"><p>NI believe that some heaters are specced as current being the overriding factor and in others voltage are the defining factor meaning that yes, for a P valve the correct current will not guarantee the expected voltage but should give the correct wattage. Agreed that the product of these two factors should always result in the the same wattage but as we have seen significant variations can occur. I do know that some ECC88 variants actually have 365mA ratings and not the expected 300mA that the nomenclature would suggest. So it would be interesting to see what the "other side" of this conundrum (volts and/or current) is with your particular *88s. Possibly the (relatively) extreme temperatures of a heater make the comparison to a resistor less reliable.</p></blockquote><p></p>
[QUOTE="handsome, post: 1096100, member: 772"] NI believe that some heaters are specced as current being the overriding factor and in others voltage are the defining factor meaning that yes, for a P valve the correct current will not guarantee the expected voltage but should give the correct wattage. Agreed that the product of these two factors should always result in the the same wattage but as we have seen significant variations can occur. I do know that some ECC88 variants actually have 365mA ratings and not the expected 300mA that the nomenclature would suggest. So it would be interesting to see what the "other side" of this conundrum (volts and/or current) is with your particular *88s. Possibly the (relatively) extreme temperatures of a heater make the comparison to a resistor less reliable. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
SCC88/PCC88 heaters in series?
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