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Why no tiny output transformers?
Why no tiny output transformers?
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Old 26th October 2017, 02:05 AM   #21
azazello is offline azazello  Bulgaria
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Hammond 125 FSE has band 10 - 50000 with the same amplitude form in my SE 2A3 RCA and SE 300B JJ whit excellent sound. Small 125s start from about 40-50 Hz. I tried DSE with 6V6 Silvania. 125s are very suitable for small amps with good results. /150 - 15000 in instruction mean to go to expensive Hammonds (: /
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Old 26th October 2017, 07:43 AM   #22
6A3sUMMER is offline 6A3sUMMER  United States
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azazello,

I have a pair of 125DSE.
Thanks for letting us know that they might be better than advertised.
I might have to try them soon.
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Old 26th October 2017, 02:14 PM   #23
smoking-amp is offline smoking-amp  United States
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The Hammond FSE and GSE OTs cost as much as the top of the line CXSE Edcor OTs with guaranteed BW 20 -20KHz <1dBu and the Edcor weigh twice as much as the Hammonds (Hammond gives shipping Wt, not actual Wt)

EDCOR - CXSE Series Output Transformers

Last edited by smoking-amp; 26th October 2017 at 02:23 PM.
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Old 26th October 2017, 02:38 PM   #24
artosalo is offline artosalo  Finland
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You are not anymore talking about tiny output transformers.
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File Type: pdf 15000-EI150-200-0X.pdf (57.6 KB, 75 views)
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Old 26th October 2017, 02:52 PM   #25
smoking-amp is offline smoking-amp  United States
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azazello mentioned Hammond FSE, it's huge too.

Smaller ones:
EDCOR - GXSE Series Output Transformers

EDCOR - XSE Series Output Transformers

Last edited by smoking-amp; 26th October 2017 at 03:06 PM.
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Old 26th October 2017, 03:06 PM   #26
artosalo is offline artosalo  Finland
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No. I mentioned the smallest Hammond:
Quote:
Hammond 125ASE
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Old 26th October 2017, 03:09 PM   #27
smoking-amp is offline smoking-amp  United States
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Yes indeed, corrected.
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Old 26th October 2017, 05:33 PM   #28
pcan is offline pcan  Italy
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Why no tiny output transformers?
I have built a 6ak6 + PC92 stereo amplifier with the Hammond 125ASE, because I had space constraints. They cost more than bigger transformers and I am not happy about the sound. The low frequency attenuation is noticeable. Still searching for a SE transformer about the same size of the 125ASE but with better specifications.
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Old 26th October 2017, 05:56 PM   #29
artosalo is offline artosalo  Finland
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Quote:
I am not happy about the sound. The low frequency attenuation is noticeable.
The sound depends on many things. For example the amount of THD varies a lot when the bias of voltage amplifying stage or output stage is adjusted.

Can you show the schematic of that amplifier ?
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Old 26th October 2017, 06:05 PM   #30
w5jag is offline w5jag  United States
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Quote:
... Thanks for letting us know that they might be better than advertised.
My 125ESE seem to be. From one of my posts in the Tubelab sub forum:

"The conditions were plate set for 10K, secondary 8 ohm, the load was 8 ohm resistive, current through the OPT is 50 mils at 415 volts.

I set 1 Khz as the 0 dB point at 1 watt output. 100 Hz was -1db, 70 Hz was - 2 dB, and 55 Hz was - 3dB. The high frequency response was flat to 6 kHz, where it began a very gentle roll off out past 30 kHz. 10 kHz was down about -0.5 dB, 15 kHz was about -0.8 db, 20 kHz was -1.5 dB and 30 kHz was - 2 dB."

I measured the inductance and it was higher than specified, but off the top of my head, don't recall what it was. They also perform pretty well on the SMPTE IMD test. IMD gets better with higher current through them.

My test equipment is pretty mediocre, but likely better than nothing. I don't know anything about the other OPTS in the 125 line.

edit: they were hooked up to 801A's.

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