[ProAudio] Western Electric 111C transformers

[Bill Whitlock]

If you're after coloration, the strongest influencer of distortion is source impedance, so I'd put something like a 1 or 2 k-ohm pot (connected as a rheostat or variable resistor) in series with the primary high side terminal.  At high-resistance settings, you'll' get some level loss - and possible high-frequency loss if there's much capacitive load (or cable) on the secondary side.  Putting a variable load resistance on the secondary, along with some intentional capacitive load to bring resonance down toward 20 kHz) will allow control of the resonance's Q.  I don't recall off-hand where the natural self-resonance of the secondary is, but I'd start with 1 nF or so and use a 50 k-ohm pot (with a series 1 or 2 k resistor to keep resistance from going to zero) variable load resistor.  Results  will, of course, guide you from there!
Bill WhitlockAES Life FellowWhitlock ConsultingVentura, CA


-----Original Message-----
From: Bob Katz via ProAudio <proaudio at bach.pgm.com>
To: proaudio at bach.pgm.com
Sent: Sat, Jan 29, 2022 1:16 pm
Subject: [ProAudio] Western Electric 111C transformers

  Hola, Guys. I’ve got a pair of these sitting around doing nothing. I’m sure their effect will be subtle but it might be nice to package them into a passive box for their color in a mastering session. 

To vary their color would you have any suggestions on switchable buildout or termination resistors or zoebel networks I might want to add to the box, in addition to hard wire bypass?

Appreciate any suggestions. Thanks 


Bob -- 
 

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