Tube DIY Asylum: RE: "Singing" Power Transformer by trobbins Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by trobbins (A ) on October 14, 2019 at 16:28:16

In Reply to: RE: "Singing" Power Transformer posted by mikeyb on October 14, 2019 at 09:57:46:

The cathode voltage will follow the conducting anode voltage, minus the Vak conduction drop. The Hammond 710 has a 375-0-375V rating, with an anode peak of circa 530V, which could go higher depending on your mains AC and whether Hammond rate the 375-0-375 at no load or rated load.

One end of the heater will be -4V at the time of peak anode voltage.

It looks to me like each 6CA4 will have its heater-cathode rating repetitively reaching the design-max rating, and probably exceed it. The design-max datasheet rating advise is 'should not be exceeded under the worst probable conditions', and this applies throughout the service life of the valve.

In general, heater-cathode resistance falls with age, and can sometimes be a service life limiting issue.

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