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Old 19th November 2006, 01:16 PM   #1
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Default TV Damper Diodes

Before I go snapping up cheap TV dampers for use as rectifiers, got one question: What does it mean on the specs when the following is written...

Ehk +100V -900V

The 900V is encouraging, but the 100V is of concern. I want to be sure these tubes can handle high enough voltages in typical tube amp service. Thanks for any help.
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Old 19th November 2006, 01:24 PM   #2
SY is offline SY  United States
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That's the allowable heater-to-cathode potential.
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Old 19th November 2006, 03:14 PM   #3
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Hi Sy,

Forgive my stupidity, but which one is the max potential difference, ie. what's the significance of the + and - voltages?
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Old 19th November 2006, 04:39 PM   #4
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Let's look it up...(searching for tube manual)... hmmm... maybe this big red book... Ehk : "voltage of heater with respect to cathode" - so the heater can be 100V positive or 900V negative with respect to cathode - or the cathode can be 900V POSITIVE with respect to heater.

But if you have a separate heater winding for rectifiers, use it.
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Old 19th November 2006, 05:48 PM   #5
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On the topic of damper diodes, anyone have experience with these?

http://frank.pocnet.net/sheets/137/6/6BL4.pdf

I picked up a few in Antique Electronic Supply's last sale. In the current sale still under $3 a pop.
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Old 19th November 2006, 10:20 PM   #6
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6BL4 is a bit hungry - 3 amps. 6DM4, 6DT4 have the same performance at 1.2A
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