[Heath] Fw: SB-102 S-Meter operation

[Joseph Smalley]

     On Sunday, March 26, 2017 10:54 PM, Joseph Smalley <mymodecw-hamitup at yahoo.com> wrote:
 

 
 Hello to the group.  I still use my SB-102 that I built in 1972,  I have two issues I want to fix.
Number ONE is the poor operation of the S-meter very rarely does the S-meter give a good reading
even on real strong signals.  A fellow ham close by gets a pinned needle on my TS-530sp on the
Sb-102 it will be S9. Most stations I work have a loud signal but low reading on the S-meter. Never S9

 I have put new 6AU6 I.F. amplifier tubes in the radio no help.  Replaced the Product detector/AVC tube, no help
Any ideas will be appreciated.
Number TWO sometimes the resting (idling) plate current will increase above the set value of 50 MA, this happens
when I get long winded CW only here. 

I recently repaired a SB-100 for a friend that had an excessive plate current reading which turned out to be
the cathode resistors on the final amplifiers.This is not what I am experiencing.  The reading was  3 ohms for the 

six 20 OHM resistors in parallel, when I replaced the resistors  the reading went to 1.6 OHMS which I measured
on another properly working SB-102.
Any info will be appreciated.
73 Joe WA3CKA 

   
 Hello to the group.  I still use my SB-102 that I built in 1972,  I have two issues I want to fix.
Number ONE is the poor operation of the S-meter very rarely does the S-meter give a good reading
even on real strong signals.  A fellow ham close by gets a pinned needle on my TS-530sp on the
Sb-102 it will be S9. Most stations I work have a loud signal but low reading on the S-meter. Never S9

 I have put new 6AU6 I.F. amplifier tubes in the radio no help.  Replaced the Product detector/AVC tube, no help
Any ideas will be appreciated.
Number TWO sometimes the resting (idling) plate current will increase above the set value of 50 MA, this happens
when I get long winded CW only here. 

I recently repaired a SB-100 for a friend that had an excessive plate current reading which turned out to be
the cathode resistors on the final amplifiers.This is not what I am experiencing.  The reading was  3 ohms for the 

six 20 OHM resistors in parallel, when I replaced the resistors  the reading went to 1.6 OHMS which I measured
on another properly working SB-102.
Any info will be appreciated.
73 Joe WA3CKA


   

   
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