[R-390] SE-3 Synchronous Detector question

[Les Locklear]

I've owned a couple of the SE-3's older and newer (not the newest) versions. No, the modifications aren't "absolutely" necessary, but the agc mods greatly improve listening on am fading stations, it also allows listening to ssb without riding the rf gain. If you look closely, it is quite similar to the Lankford AGC Mod.

Regarding the RT510/3TF7 Ballast Tube, there are more threads than you can possibly imagine on replacement modifications.

I think there is no need for a fragile troublesome tube in the R-390A/URR, and replaced mine with great results.

YMMV.

Les Locklear
Gulfport, Ms.
Dx'ing since '57
http://www.hammarlund.info/



  ----- Original Message ----- 
  From: frankshughes at aim.com 
  To: r-390 at mailman.qth.net 
  Sent: Tuesday, January 20, 2009 8:51 AM
  Subject: [R-390] SE-3 Synchronous Detector question


  Hi 
  I want to add a Sherwood Engineering SE-3 Synchronous Detector to my 390A. 
  Rob @ Sherwood sent me some schematics about mods needed to improve performance w/ the Synchronous Detector.

  Anyone here had experience using the Sherwood SE-3 w/ a 390A?
  Are the AGC and current regulator mods really necessary or not for the Sherwood to work properly?
  (It's not completely clear to me if the current regulator mod he sent pertains to the 390 or the "A" or both,
  the schematic references R390 current reg RT510)
  Thanks,
  Frank



------------------------------------------------------------------------------
  A Good Credit Score is 700 or Above. See yours in just 2 easy steps! 


------------------------------------------------------------------------------


  _____________________________________________________________
  R-390 mailing list
  Home: http://mailman.qth.net/mailman/listinfo/r-390
  Help: http://mailman.qth.net/faq.htm
  Post: mailto:R-390 at mailman.qth.net
  Unsubscribe: http://mailman.qth.net/mailman/options/r-390


------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 8.0.233 / Virus Database: 270.10.9/1902 - Release Date: 01/19/09 09:37:00
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/r-390/attachments/20090120/e7ddfa69/attachment.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: multipart/alternative
Size: 0 bytes
Desc: not available
Url : http://mailman.qth.net/pipermail/r-390/attachments/20090120/e7ddfa69/attachment.bin 
-------------- next part --------------

No virus found in this outgoing message.
Checked by AVG - www.avg.com 
Version: 8.0.233 / Virus Database: 270.10.9/1902 - Release Date: 01/19/09 09:37:00