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From: liz@poppyrecords.invalid.invalid (Liz Tuddenham)
Newsgroups: sci.electronics.design
Subject: Re: big L
Date: Sun, 22 Dec 2024 14:10:28 +0000
Organization: Poppy Records
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legg <legg@nospam.magma.ca> wrote:

> On Sat, 21 Dec 2024 22:01:36 +0000, liz@poppyrecords.invalid.invalid
> (Liz Tuddenham) wrote:
> 
> >Cursitor Doom <cd@notformail.com> wrote:
> >
> >> On Sat, 21 Dec 2024 11:35:54 -0800, john larkin <JL@gct.com> wrote:
> >> 
> >> >On Sat, 21 Dec 2024 16:53:07 +0000, Cursitor Doom <cd@notformail.com>
> >> >wrote:
> >> >
> >> >>On Sat, 21 Dec 2024 11:16:18 -0500, legg <legg@nospam.magma.ca> wrote:
> >> >>
> >> >>>On Tue, 17 Dec 2024 06:58:32 -0800, john larkin <JL@gct.com> wrote:
> >> >>>
> >> >>>>What's the biggest inductor, the most Henries, that you know of? I
> >> >>>>seem to recall some audio transformer that was something like 100 H.
> >> >>>
> >> >>>The SAFT/Alcatel plant in Scarborough used to have 
> >> >>>largish inductors for loading. Air-cored - ~10ft 
> >> >>>on a side.
> >> >>>
> >> >>>Your watch would stop, if you were too close.
> >> >>>
> >> >>>Large L ? Who needs it?
> >> >>
> >> >>In the olde days we used to have audio output transformers  for
> >> >>impedance matching purposes, but modern amps don't seem to need 'em.
> >> >
> >> >And long ago tubes were expensive so it made sense to get voltage gain
> >> >from interstage transformers.
> >> 
> >> Indeed. And that's just one aspect of it. The designers in the early
> >> stage of toob development deserve huge respect for the performance
> >> they were able to wring out of a single stage - and all just to save
> >> the hard-pressed consumer back in the day a few sheckles.
> >
> >Have a look at:
> ><http://www.poppyrecords.co.uk/httpdocs/other/AMC5.pdf>
> >as an example of incredibly efficient design.  It took the output from a
> >ribbon mic and raised it to 0dBm line level.  By using a mixture of
> >current and voltage feedback, it terminated the mic correctly without
> >the need for a terminating resistor, which would have wasted signal
> >power and generated Johnson noise.
> 
> link not valid from here . . . .

My apologies, it should have been:

<http://www.poppyrecords.co.uk/other/AMC5.pdf>

(Pleae note, it is "http" not "https".)

-- 
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk