[ProAudio] Western Electric 111C transformers

[Bill Whitlock]

Increasing source impedance will always increase LF distortion.  See the plots on page 2 of a typical transformer, where THD is shown for 3 different source impedances.  Seehttps://www.jensen-transformers.com/wp-content/uploads/2014/08/jt-11-dmcf.pdf.  The core material (and its annealing process) will determine just how low the THD will ever get.
A Jensen data sheet can be quite educational if read carefully ...
Bill WhitlockAES Life Fellow(and president/chief engineer of Jensen Transformers 1989-2014)Whitlock ConsultingVentura, CA


-----Original Message-----
From: Scott Dorsey via ProAudio <proaudio at bach.pgm.com>
To: proaudio at bach.pgm.com; bobkatz at digido.com
Sent: Mon, Jan 31, 2022 8:43 am
Subject: Re: [ProAudio] Western Electric 111C transformers

Oh, if you want a resonant HF ring, just leave off the termination load.
The 111C was designed to work into a very consistent load and it does
not do well into an open.  

My suspicion is that raising the source impedance will first make for
higher low end distortion but... I never tried it on the bench.
--scott
_______________________________________________
ProAudio mailing list
ProAudio at bach.pgm.com
http://bach.pgm.com/mailman/listinfo/proaudio
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://bach.pgm.com/pipermail/proaudio/attachments/20220131/c1f8557d/attachment.html>