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Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
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Old 16th March 2018, 04:23 PM   #31
Michael Rothacher is offline Michael Rothacher  United States
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Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
Interesting, lots of prominent investors. Alas, it's all over my head.
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Old 6th April 2018, 03:39 PM   #32
koja is offline koja  Canada
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Originally Posted by Nelson Pass View Post
It so happens that prototypes of the next DIY amplifier are on my bench
anyway, so I measured several examples.
this sounds like it might be that secret relabeled ACA with an M2ish input?

I will be making that one to try to soften the mids in my tri-amped OB (F5+ACA+ACA), though I must say the original ACA is already sooo good in that limited role that it might be a stretch to beat that performance. But packaging 2 channels in one housing is an added incentive; the second one is that I never experienced these Edcors, Jensens etc.; (after that I only have "to worry about" putting to use the 4 pairs I have of 201/1530 Toshibas. I am probably close to that point which ZenMod cited as having it "good enough" and just messing around for the sake of DIY (as these days I find myself more often opting for listening to music than going to my workbench ).
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Old 6th April 2018, 04:32 PM   #33
Zen Mod is offline Zen Mod  Serbia
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Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
why not combine both - muzak and bench?
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Old 9th April 2018, 03:01 AM   #34
koja is offline koja  Canada
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it's a thought; but naaah, I like a lazy muzak nirvana when I get a break. In the shop I usually have to pay attention or a rework is guaranteed .
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Old 9th April 2018, 01:29 PM   #35
Mark Johnson is offline Mark Johnson  United States
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Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
I measured two samples of the Edcor PC600-15K transformer used in the First Watt M2.

The end-to-end DC resistance of the primary (pin1 to pin3) averaged 44 ohms.

The end-to-end DC resistance of the secondary (pin7 to pin5) averaged 235 ohms.

See whether you are able to use these measured values, along with the transformer's frequency response curve (attached below), to calculate a lower bound for the inductance of the primary and the inductance of the secondary. Remember that this transformer is marketed as a "600 ohm to 15 Kohm line level matching transformer". I predict it won't match the inductances I measured on these transformers, not even close. Buy a few and measure them yourself, they cost less than $8.

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Old 9th April 2018, 04:39 PM   #36
Nelson Pass is offline Nelson Pass  United States
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Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
Quote:
Originally Posted by Zen Mod View Post
why not combine both - muzak and bench?
My desk, Jordan J92's and ACA's
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Old 9th April 2018, 06:57 PM   #37
Zen Mod is offline Zen Mod  Serbia
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Perplexed about M2 amplifier circuit impedance: schematic vs. user manual
for zillionth time ....... as seen from my bench



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