K&K Audio / Lundahl Transformers

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

Return to K&K Audio / Lundahl Transformers

K&K Audio / Lundahl Transformers

RE: Upgrading SE Phono Revision 1 (2007) board to Revision 5 or whatever realistically possibly

69.85.222.129

In Reply to: RE: Upgrading SE Phono Revision 1 (2007) board to Revision 5 or whatever realistically possibly posted by ceriatone@gmail.com on October 03, 2013 at 13:59:07

The unit pictured shows the JFets and (-) power supply transformer (the newest update). I thought you were showing an updated unit.

Follow Ups:

RE: Upgrading SE Phono Revision 1 (2007) board to Revision 5 or whatever realistically possibly - KevinC 10:23:13 10/14/13 (2)
The phono preamp in the picture is an updated (latest) Rev 5 main board preamp. It has the new MOSFET input transistors and the supporting source CCS and minus supply (choke and rectifier/filter board).

Soon there will be a Rev 6 main board version posted on the website. The Rev 6 board has the new parts discussed above incorporated, plus two other sonically significant changes. The first is a shunt regulator (similar topology to that in the shunt regulator kit) for each channel and the other is AC filaments, with a wiring shield arrangement that results in no AC filament hum. The price change will be minimal.

Lest you ask, there is no straightforward way, given the space in the enclosure, to fit two shunt regulators to older K&K Audio phono preamps. I wish this weren't true, but...

Kevin Carter
K&K Audio
www.kandkaudio.com
- RE: Upgrading SE Phono Revision 1 (2007) board to Revision 5 or whatever realistically possibly - AnandR 18:55:16 10/17/13 (1)
  How about those of us who do have the space? Feasible?
  
  Makes me sad :-( I just finished building mine...
  
  Best,
  Anand.
  - RE: Upgrading SE Phono Revision 1 (2007) board to Revision 5 or whatever realistically possibly - KevinC 13:19:33 10/24/13 (0)
    Anything is feasible, but is it practical? You can accomplish the same thing as I did on the Rev 6 board with two Shunt Regulator Kits and some parts removals from earlier boards. In my standard enclosure there is no practical place to put the two regulator boards, though.
    
    Kevin Carter
    K&K Audio
    www.kandkaudio.com

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Schiit Audio