TV Damper Diodes

Jack Thomas · 31st March 2003, 10:13 PM

Does anyone know what TV damper diodes are? Help!
Heard they're great for rectifiers.
Jack T.

fdegrove · 31st March 2003, 10:27 PM

Hi,

This should enlighten you:

From the Svetalna website:

Quote:

Damper diodes were designed to clip the negative "ringing" pulse appearing across a TV set's horizontal deflection coil during the retrace interval. Dampers must be able to handle relatively high peak currents and high reverse voltages without arc-over. Since the cathode of such tubes is usually floating above ground and sees very high-voltage peaks, running the damper on the same filament supply as the rest of the tubes in a TV set requires that the damper have its heater very well-insulated from the cathode.

In case you want to read to entire document:

6D22S

Hope it helps,

Brett · 1st April 2003, 05:31 AM

Quote:

Originally posted by Jack Thomas
Does anyone know what TV damper diodes are? Help!
Heard they're great for rectifiers.
Jack T.

Frank eksplain'd their original purpose, but they make great rectifiers. I don't use anything else now. They're also cheap, tough and available, though they often need a less common socket.

EC8010 · 1st April 2003, 09:17 AM

They're known in the UK as efficiency diodes because they greatly increase the efficiency of a TV line scan circuit during flyback compared to the older method that used a resistor to damp the oscillation. They are rugged and cheap, so they make good rectifiers, but they usually have top cap anodes (to withstand the 2kV needed for TV flyback), so they should be treated with a healthy respect.

dhaen · 1st April 2003, 09:19 AM

Quote:

Originally posted by EC8010
They're known in the UK as efficiency diodes because they greatly increase the efficiency of a TV line scan circuit during flyback compared to the older method that used a resistor to damp the oscillation. They are rugged and cheap, so they make good rectifiers, but they usually have top cap anodes (to withstand the 2kV needed for TV flyback), so they should be treated with a healthy respect.

The top caps are the cathodes in my experience

Cheers,

EC8010 · 1st April 2003, 09:27 AM

You're absolutely right, whatever was I thinking of? Mind you, as an HT rectifier, accidentally catching the cathode will still hurt!

dhaen · 1st April 2003, 09:31 AM

Yes, you vibrate more

Cheers,

Edit... I should have said less!!!!

ray_moth · 9th September 2007, 06:14 AM

To resurrect this hoary old thread, I just wanted to ask if anyone is aware of any sonic disadvantages of dampers, with respect to directly heated types like the 5U4? My personal feeling is that nothing sounds better than dampers but I don't have any first-hand experience of filamentary rectifiers.

Klimon · 10th September 2007, 04:23 PM

Right there with the previous question; is anybody using 6d22s at low voltages + low current draw? I heard (say) they need some juice to sound okay.

Simon

31st March 2003, 10:13 PM	#1
Jack Thomas diyAudio Member Join Date: Jul 2002 Location: Baltimore, Maryland, USA	TV Damper Diodes Does anyone know what TV damper diodes are? Help! Heard they're great for rectifiers. Jack T.

1st April 2003, 09:17 AM	#4
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Health and efficiency They're known in the UK as efficiency diodes because they greatly increase the efficiency of a TV line scan circuit during flyback compared to the older method that used a resistor to damp the oscillation. They are rugged and cheap, so they make good rectifiers, but they usually have top cap anodes (to withstand the 2kV needed for TV flyback), so they should be treated with a healthy respect. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

1st April 2003, 09:27 AM	#6
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Inefficiency You're absolutely right, whatever was I thinking of? Mind you, as an HT rectifier, accidentally catching the cathode will still hurt! __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

1st April 2003, 09:31 AM	#7
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Catching a cathode Yes, you vibrate more Cheers, Edit... I should have said less!!!!

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9th September 2007, 06:14 AM	#8
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	To resurrect this hoary old thread, I just wanted to ask if anyone is aware of any sonic disadvantages of dampers, with respect to directly heated types like the 5U4? My personal feeling is that nothing sounds better than dampers but I don't have any first-hand experience of filamentary rectifiers.

10th September 2007, 04:23 PM	#9
Klimon diyAudio Member Join Date: Apr 2005 Location: Leuven	Right there with the previous question; is anybody using 6d22s at low voltages + low current draw? I heard (say) they need some juice to sound okay. Simon

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