HV transformer replacement

trans · 8th March 2009, 04:47 AM

One of the HV DC supply transformers in my 1990s era Electrostatic Research speakers went out. The input is AC Mains, and one secondary connects across a leg of a 2200m 6kv cap to the diaphragm, the other one connects to a series of resistors and a rectifier to the audio signal transformer. The only marking on the transformer is TDS 9629B. How can I determine the DC voltage and find a replacement. I don’t have a HV probe to check the other transformer. Are there any other options?

trans

Bazukaz · 12th March 2009, 02:33 AM

Can you post a good quality photo or try to re-draw schamatic diagram of your EHT supply?

Regards,
Lukas.

trans · 14th March 2009, 12:29 PM

Lukas,

Thanks for replying. I solved the problem by running DC voltage from the secondaries to the primaries, in effect reversing the transformer to a stepdown. The ratio is the same either direction.

trans

8th March 2009, 04:47 AM	#1
trans diyAudio Member Join Date: Oct 2008	HV transformer replacement One of the HV DC supply transformers in my 1990s era Electrostatic Research speakers went out. The input is AC Mains, and one secondary connects across a leg of a 2200m 6kv cap to the diaphragm, the other one connects to a series of resistors and a rectifier to the audio signal transformer. The only marking on the transformer is TDS 9629B. How can I determine the DC voltage and find a replacement. I don’t have a HV probe to check the other transformer. Are there any other options? trans

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12th March 2009, 02:33 AM	#2
Bazukaz diyAudio Member Join Date: Nov 2005 Location: Vilnius	Can you post a good quality photo or try to re-draw schamatic diagram of your EHT supply? Regards, Lukas.

14th March 2009, 12:29 PM	#3
trans diyAudio Member Join Date: Oct 2008	Lukas, Thanks for replying. I solved the problem by running DC voltage from the secondaries to the primaries, in effect reversing the transformer to a stepdown. The ratio is the same either direction. trans

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