Heater/cathode supply

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acorn
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#1 Heater/cathode supply

Post by acorn »

Good day all

Has any one a good circuit to use to lift the heater votage of a concertina phase splitter in order to diminish the chaces of a heater /cathode break down, is this the best solution or are there other circuits to consider.

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pre65
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#2

Post by pre65 »

Potential divider I would have thought.

Here is a calculator.

http://www.electronics2000.co.uk/calc/p ... ulator.php
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Mike H
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#3

Post by Mike H »

I might consider split the lower concertina resistor into two, and tap it into there :?:

Followed with a bit of an RC filter natch.

I presume concertina phase-splitter grid is DC connected to 1st stage anode? Sounds like it is :D
 
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IslandPink
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#4

Post by IslandPink »

Low current voltage divider as Phil says, get values to give you a mA or 2 ma . Put a suitable cap (100u, 220u ) across the lower resistor to get a low-Z AC ground, otherwise the electrostatic coupling onto the transformer winding will pull it around and put noise onto the filament & hence cathode .

Thanks for the resistors, Neil !
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acorn
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#5 Heater/cathode

Post by acorn »

Good -day

Thanks for the information lads.


Acorn
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