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Question about centre tapped filament supplies for vacuum tubes/valves.

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LAN_403

Ash Small

Fri Mar 25 2016, 12:57PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

Proud Mary wrote ...

I see from a datasheet that the max allowable peak heater to cathode voltage for 807 is 135V. Your design won't reach that figure, I take it?

I've had a rummage through my VRs and couldn't find anything close to the specs in the circuit diagram.

Thanks for pointing out the 135V limit, PM. I can't say I've really studied the datasheet yet. I'm aware of the 300V limit when triode strapped.

I think Chris said something about adjusting VR2 and VR3 until the voltage across R2 is about 140V. He does reccomend using a floating winding, and just tying one end to the cathode.

I think I have some VR's that are close enough.

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