K&K Audio / Lundahl Transformers

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Maxx'ed Out Phono Stage MC loading

174.194.26.194
Posted on July 2, 2020 at 10:38:25
MWE
Audiophile

Posts: 2202
Location: Burlington, NC
Joined: June 8, 2000
 Bought and built one of these about 12 years ago, still working well and I'm still extremely happy with it. Have adjusted MC loading over the years by ear, however, I'm still not clear on the meaning of the settings. Are the indicated resistance values (25, 50, 100, 200, etc.) equivalent to what they would be as a pure gain stage, even though step-up transformers are being used?
Thanks in advance.

Mark in NC
Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

 

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RE: Maxx'ed Out Phono Stage MC loading , posted on July 2, 2020 at 11:32:01
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 Hi Mark, The numbers adjacent to the switch positions are resistor values, which with the proper math and the step-up ratio can be used to calculate the actual load impedance.

I offer, for asking, a spreadsheet program that will allow you to calculate that load impedence. Send an e-nail to me and I will happily send it to you.
Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: Maxx'ed Out Phono Stage MC loading , posted on July 2, 2020 at 14:50:12
MWE
Audiophile

Posts: 2202
Location: Burlington, NC
Joined: June 8, 2000
 Thanks, Kevin. I wasn't sure if you had possibly set these up in such a way, like finagling the preamp's input resistance, that the numbers on the switch equaled that of a straight gain stage. I will send an email posthaste for the spreadsheet to get the actual values, thanks much.

Mark in NC
Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

 

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