TV Damper Diodes

CarlyBoy · 19th November 2006, 12:16 PM

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.

SY · 19th November 2006, 12:24 PM

That's the allowable heater-to-cathode potential.

CarlyBoy · 19th November 2006, 02:14 PM

Hi Sy,

Forgive my stupidity, but which one is the max potential difference, ie. what's the significance of the + and - voltages?

Tom Bavis · 19th November 2006, 03:39 PM

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.

rdf · 19th November 2006, 04:48 PM

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.

Eusebius · 19th November 2006, 09:20 PM

6BL4 is a bit hungry - 3 amps. 6DM4, 6DT4 have the same performance at 1.2A

19th November 2006, 12:16 PM	#1
CarlyBoy diyAudio Member Join Date: Aug 2006	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.

19th November 2006, 12:24 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	That's the allowable heater-to-cathode potential. __________________ If there's a sucker born every minute, where do the rest of them come from?

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19th November 2006, 02:14 PM	#3
CarlyBoy diyAudio Member Join Date: Aug 2006	Hi Sy, Forgive my stupidity, but which one is the max potential difference, ie. what's the significance of the + and - voltages?

19th November 2006, 03:39 PM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	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.

19th November 2006, 04:48 PM	#5
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	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.

19th November 2006, 09:20 PM	#6
Eusebius diyAudio Member Join Date: May 2006	6BL4 is a bit hungry - 3 amps. 6DM4, 6DT4 have the same performance at 1.2A