K&K Audio / Lundahl Transformers

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1676 and eries resistance

197.91.250.25
Posted on March 25, 2016 at 01:49:51
handsome
Audiophile

Posts: 4
Joined: January 16, 2010
 hey there,
i am putting together a PP amp using a 1676 as an input phase splitter (2:1+1) feeding a differential stage. i shall be using shunt feedback to both the grids of the differential stage. normally loading is across the input tx windings and all secifications are given that way - i am curious as to how this series loading will affect my 1676? how does series loading look to an TX? and is there an appropriate range of series resistance that will maximise bandwidth?

 

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RE: 1676 and eries resistance, posted on March 26, 2016 at 04:39:55
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 Since I have no experience with shunt feedback I will need to see a schematic to be able to (hopefully) contribute an answer to your question.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: 1676 and eries resistance, posted on March 26, 2016 at 05:45:25
handsome
Audiophile

Posts: 4
Joined: January 16, 2010



already posted this but don't think it went through so here goes again:

here is the schematic. values are not yet formalised. however i think i have worked it out: although each resistor in each leg of the 1676 appears in series with the transformer, the other end of each resistor is connected to a virtual earth ergo electrically they are indeed connected "across" the 1676 as a traditional loading resistor would be. so i guess it comes down to how close the virtual earth is i to the genuine circuit earth which i suppose is a function of gain. Am i correct in this?

 

RE: 1676 and eries resistance, posted on March 29, 2016 at 08:27:34
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 Yes, I agree.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

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