"two complete network analyzers"

Why two?

I can easily see one - but two?

I could see cases where the concurrent use
of two NAs could/would interfere with each
other, as 'network analyzers' per se, 'excite'
the CUT/DUT (Circuit or Device Under Test)
then observe/display the 'excited' circuit's
response.

Jim

----- Original Message -----
From: "Peter L. Peres" <plp@ACTCOM.CO.IL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, September 05, 2001 2:17 PM
Subject: Re: [EE]: Pages on the web about audio transformers


> > What tools
>
> If you want to characterize the transformers properly you probably need
> two complete network analyzers and some auxiliary DC and AC sources to
> simulate ground loop, external magnetic fields, DC components in some of
> the windings, etc.
>
> If you are satisfied to go 'by ear', get a pair of good ready made
> transformers a reel of cable and a switchover device (to switch to your
> transformers and to the good ones), and start testing with your friends.
> The comparison with the factory made units will remove some of the
> siubjectivity in the tests.
>
> Of course you know that overdriving transformers with certain core
> materials (soft saturation) is one of the old ways to get a good guitar
> fuzz ;-). In fact the core material is extremely important for good sound.
>
> You could also cheat and get two miniature 600 Ohm bal/unbal transformers
> for use in audio equipment and build a small preamp to drive them in the
> guitar (impedance transformer with a little gain, like 3-5dB). These will
> transformers cost $10+ each.
>
> Peter
>

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