RE: Measurement of 30 output transformers for SE300B

Posted by Jmmlc (A) on December 15, 2009 at 02:11:57

In Reply to: RE: Measurement of 30 output transformers for SE300B posted by Paul Joppa on December 11, 2009 at 21:19:33:

Hello Paul

The loudspeaker used for the shoot-out of OPTs at ETF2009 is a replica of Shindo's Latour:
http://www.shindo-laboratory.co.jp/English/speaker.html

Its efficiency is given as 100dB/1W/1m.

Main limitation for the 0.5watt power used for the measurement of each OPT was the 84volt peak to peak max sinus delivered at the output of the very low distortion and very low output impedance transistor amplifier (a 120W/8ohms Bryston PP120) used at the output of the low frequency generator. To find an amplifer with no distortion able to deliver 150V peak to peak would have been ideal for such measurements but that's a dream I cannot afford. ;-)

Best regards from Paris,

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Follow Ups Full Thread

Topic - Measurement of 30 output transformers for SE300B - Jmmlc 07:03:49 12/11/09 (18)

As interesting as I thought the whole test would be - Bas Horneman 10:31:08 12/14/09 (6)

Too bad that Audio Note OPT won... - Wojciech 17:29:14 12/16/09 (4)

RE: Too bad that Audio Note OPT won... - danlaudionut 22:30:17 12/18/09 (3)

RE: Too bad that Audio Note OPT won... - Wojciech 05:54:13 12/19/09 (2)

RE: Too bad that Audio Note OPT won... - danlaudionut 09:45:52 12/19/09 (1)

Just Perhaps, The Best Transformer Won? - Peter Qvortrup 09:02:56 01/15/10 (0)

RE: As interesting as I thought the whole test would be - Jmmlc 01:55:56 12/15/09 (0)

RE: Measurement of 30 output transformers for SE300B - Mike B. 13:17:18 12/11/09 (3)

but only by about 1 dB, look at the scale (nt) - JJ Triode 17:18:44 12/11/09 (2)

RE: but only by about 1 dB, look at the scale - Mike B. 19:12:53 12/11/09 (1)

RE: but only by about 1 dB, look at the scale - Paul Joppa 21:21:56 12/11/09 (0)

RE: Measurement of 30 output transformers for SE300B - dave slagle 09:58:17 12/11/09 (6)

RE: Measurement of 30 output transformers for SE300B - Jmmlc 09:45:26 01/04/10 (0)

RE: Measurement of 30 output transformers for SE300B - Paul Joppa 16:53:44 12/11/09 (4)

RE: Measurement of 30 output transformers for SE300B - dave slagle 19:41:15 12/11/09 (3)

RE: Measurement of 30 output transformers for SE300B - Paul Joppa 21:19:33 12/11/09 (2)

RE: Measurement of 30 output transformers for SE300B - Jmmlc 02:11:57 12/15/09 (0)

Good summary Paul (nt) - Naz 19:35:27 12/14/09 (0)

Follow Ups

RE: Measurement of 30 output transformers for SE300B - Jmmlc 02:11:57 12/15/09 (0)

RE: Measurement of 30 output transformers for SE300B

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