[Heath] SB-102 Idling plate current

[Ray Gustafson]

I had that problem back in the 70's when I used the rig a lot and it was one of the final tubes , there was Grid leakage and I got new tubes from Heath as my HW-101 was still under warranty and it fixed it , I wasa Novice then and on CW a lot. 
                                                                       Ray WB0HHM
      From: G3OOU--- via Heath <heath at puck.nether.net>
 To: mymodecw-hamitup at yahoo.com; heath at puck.nether.net 
 Sent: Tuesday, February 23, 2016 2:32 AM
 Subject: Re: [Heath] SB-102 Idling plate current
   
Hi Joe Apart from the possibility that the final tubes have a problem does anything else change, for example the negative bias voltage or screen/anode supplies? Are the finals stable and correctly neutralised? Any resistors/pots around the finals that are misbehaving or out of tolerance? 73

Bob
Bob F Burns G3OOU, G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: http://www.g3oou.co.uk/
Technical web site: http://www.qsl.net/g3oou In a message dated 23/02/2016 03:36:14 GMT Standard Time, heath at puck.nether.net writes:
  Hello fellow Hams, Name is Joe, call WA3CKA, builder of my SB-102 in 1972, updated 3 years ago in use everyday. 
 I find that the idling plate current rises above the 50 ma setting as I transmit in a normal length CW QSO maybe 5 minutes.  
 
 Final tubes were new old stock now 3 years old.  Any suggestions as what may be causing this condition. 
 You can speak to me in technical terms if you want as I am a retired electronics tech.  So far I find nothing wrong. 
 I only do CW.  73 to all. 
 Joe WA3CKA
 
 


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