SB-102, the saga continues

[Ron Manfredi]

I no longer have a '102, but isn't the driver tube in a shield?  I seem 
to remember the shield on mine being soldered to the socket.  Make sure 
there is a good connection from the shield to ground.

Good luck with the troubleshooting!

73,
Ron  WA2EIO



howard holden wrote:

>Emil - I am sure other have asked, but do you have the correct finals in there - 6146, not 6146B?
>
>I have not had this problem with my SB-102.
>
>Howie WB2AWQ
>  ----- Original Message ----- 
>  From: Emil Dular<mailto:WD4SCZ at AOL.COM> 
>  To: HEATH at LISTSERV.TEMPE.GOV<mailto:HEATH at LISTSERV.TEMPE.GOV> 
>  Sent: Sunday, September 23, 2007 2:16 PM
>  Subject: [HEATH-TEMPE] SB-102, the saga continues
>
>
>  Thanks to all,
>
>  A couple have pointed out the finals must be self-excited. 
>
>  I pulled the the driver and also subbed another 6CL6. With the tube out of
>  the circuit the idling plate current on all bands goes about 60 milliamps.
>  With a tube in and the bias adjusted for 50 milliamps on 80 meters it is 50
>  on all the other bands except 40 meters. A quick check with "original" 6CL6
>  it will be anywhere from 150 to 250 milliamps and bias adjustment has no
>  effect. And it is oscillating to beat the band, plenty of something into the
>  dummy load. The second driver starts out at 60 or so milliamps but with
>  seconds starts a slow rise over the next 5 seconds to 150 milliamps.
>  Swapping out drivers was the second thing I tried.  Neutralizing the finals
>  again was first. What am I not seeing?  Guess the next thing to do is slide it out of the case and see if doing the voltage checks gives me a clue.
>
>  Emil WD4SCZ
>
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