OPT test data?

Ty_Bower · 21st March 2009, 03:23 AM

There's a PDF document out there somewhere from a well known audio enthusiast. It documents measured performance data from a variety of well known output transformers. The author categorized their performance (A, B, C, etc.) depending how well each test subject fit profile A, etc. He also noted the -3dB point at one or both ends of the audio spectrum. The last few pages of the document had images of typical "A" transformers, "B", etc.

Does anyone recall the link to the document I referencing? I can't seem to find it now...

Tom Bavis · 21st March 2009, 12:32 PM

It was John Atwood - it's at one-electron.com. If you don't have that site bookmarked for schematics, you should...

Ty_Bower · 22nd March 2009, 12:17 AM

Yes, that's the one. Thank you, Tom. I've got it printed out at the office, but I don't have access to that printed copy right now.

21st March 2009, 03:23 AM	#1
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	OPT test data? There's a PDF document out there somewhere from a well known audio enthusiast. It documents measured performance data from a variety of well known output transformers. The author categorized their performance (A, B, C, etc.) depending how well each test subject fit profile A, etc. He also noted the -3dB point at one or both ends of the audio spectrum. The last few pages of the document had images of typical "A" transformers, "B", etc. Does anyone recall the link to the document I referencing? I can't seem to find it now...

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21st March 2009, 12:32 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	It was John Atwood - it's at one-electron.com. If you don't have that site bookmarked for schematics, you should...

22nd March 2009, 12:17 AM	#3
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	Yes, that's the one. Thank you, Tom. I've got it printed out at the office, but I don't have access to that printed copy right now.

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