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Modular Amps
Egnater / Randall Modular Amps
Fuses?
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<blockquote data-quote="kc2eeb" data-source="post: 86870" data-attributes="member: 811"><p>You may have had a heater short to cathode failure. That would explain </p><p>no heater glow. You can check for internal tube shorts either in (some) tube testers or, if you're patient, with a DMM or VOM. The fuses for the bias pots are for plate current draw. There are internal fuses on the power supply</p><p>board for the heaters. You can have plate voltage on the heaters from a defective tube and not blow a fuse if there is no path to ground for the HV.</p></blockquote><p></p>
[QUOTE="kc2eeb, post: 86870, member: 811"] You may have had a heater short to cathode failure. That would explain no heater glow. You can check for internal tube shorts either in (some) tube testers or, if you're patient, with a DMM or VOM. The fuses for the bias pots are for plate current draw. There are internal fuses on the power supply board for the heaters. You can have plate voltage on the heaters from a defective tube and not blow a fuse if there is no path to ground for the HV. [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
Fuses?
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