K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share you ideas and experiences.

Return to K&K Audio / Lundahl Transformers

PP or SE driver for SE 845??

24.47.70.101

Posted on November 1, 2009 at 19:34:49

HL

Kevin,

Assuming all other conditions are equal, will the SE driver require a bigger IT transformer compared to the PP driver for the same swing?
Never seen a schematic of the power amp like PP-to-SE, is there any sonic drawback using a PP driver for a high power output tube, say 845, in SE? it seems a lot depends on first stages and having them in differential configuration should sound better. Also, the PP IT transformer is capable of much larger voltage swing for the demanding 845, am I missing something?

Would appreciate for your comments,
HL

RE: PP or SE driver for SE 845??

KevinC

06:02:52 11/02/09

RE: PP or SE driver for SE 845??, posted on November 2, 2009 at 06:02:52

KevinC
Manufacturer

Posts: 1999
Joined: April 19, 2001
Contributor
Since: October 7, 2002

Your reasoning is correct. For the same swing with the same low frequency response limit a transformer that will have net current flow through the primary (SE) will have to be larger than one that does not have net current flow (PP).

On the second question, I will avoid stepping into the opinion pit due to lack of direct experience. There is no reason why one couldn't use a diff transformer coupled driver stage to push a SE output stage. I'm sure it's been done before, but I just haven't ever heard one.

Kevin Carter
K&K Audio
www.kandkaudio.com

Page processed in 0.007 seconds.