Highest Practical Primary Z in OPT?

dsavitsk · 2nd April 2008, 06:40 PM

Does anyone have a guess as to what the highest practical primary impedance would be in a small signal, parafeed, output transformer? I would like to transformer couple something like a 6SL7 -- either with a high Z CCS load, or perhaps as a SRPP to lower Zout a little-- and trade all the gain for current. Is this reasonable to do?

HollowState · 2nd April 2008, 07:25 PM

Since you're parafeeding, I know that UTC makes some 15 & 30K primaries (split) in the HA and LS series. And you could reverse some of the other input types that have up to 100K (split). Trouble is, they're expensive as hell these days. Maybe Jensen has something cheaper.

2nd April 2008, 06:40 PM	#1
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	Highest Practical Primary Z in OPT? Does anyone have a guess as to what the highest practical primary impedance would be in a small signal, parafeed, output transformer? I would like to transformer couple something like a 6SL7 -- either with a high Z CCS load, or perhaps as a SRPP to lower Zout a little-- and trade all the gain for current. Is this reasonable to do? __________________ http://www.ecpaudio.com

2nd April 2008, 07:25 PM	#2
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Since you're parafeeding, I know that UTC makes some 15 & 30K primaries (split) in the HA and LS series. And you could reverse some of the other input types that have up to 100K (split). Trouble is, they're expensive as hell these days. Maybe Jensen has something cheaper. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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