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Old 8th February 2003, 01:58 PM   #1
walk is offline walk
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Join Date: Nov 2001
Location: Estonia
Default need 创quiet创filament supply for 26

How build 创quiet创battery-free filament supply for 26?
I have 2-0,75-0-0,75-2V; 3A transformers for that. Is trying AC he
re waste time only?

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Old 8th February 2003, 02:21 PM   #2
fdegrove is offline fdegrove  Europe
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Location: Belgium
Default #26


According to RCA this tube was designed for AC heater operation.

It requires 1.5 V at 1.05 A and can be fed from DC as well.

When DC is used to operate the filament, the grid and plate returns should be connected to the negative filament terminal.

For AC the plate and grid return lead should be brought to 1/ the wiper of a 20 to 40 Ohm pot across the filament winding, or 2/ the CT of the xformer winding itself.

Dixit RCA anno 1933...

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