SB102 Receive Audio Quality

[Phil Bartells]

At 07:00 AM 6/3/1999 -0700, you wrote:
>A few days ago I missed a thread that started with
>someone offering some 6HS6 tubes for sale.
>Unfortunately I missed the sale however the seller
>said they would improve the reception and audio of the
>SB tranceivers. What we need to know is what tubes
>they are substituted for in the SB series and if we
>knew that we would both have the answer to the same
>problem.  So if someone could help john and me out by
>explaining to us what tubes are the 6HS6 substitutes
>for we would both apreciate it.
>

See below from service bulletin, looks like they belong at V10 & V11
replacing the 6AU6's normally there.  I have them in my SB-101 and they
work fine.  Also, I was told by another SB-101 owner that is where they
belong.  He stated: the two 6HS6's are V10 RF amp and V11 First Receiver
Mixer tube..and yes they are a direct replacement for the 6au6's but with a
better noise figure.

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                         June 5, 1978
SB-101
Bulletin No:
SSB Transceiver
                        SB-101-14

                                                      Poor AGC Action

Leakage in the 6HS6 [PN 411-247] at V10 and/or V11 has been found to
cause:

                -  Poor AGC action
                -  Fast S-Meter decay,
                -  Poor sensitivity when RF gain control is fully clockwise.

This usually occurs after warmup of at least an hour.  A positive
voltage, usually over 1 volt, will appear at the grid, pin 1 of either
one or both tubes.

Replacement of the tube with the positive voltage corrects the problem.
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73,
Phil Bartells

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Phil Bartells, SIMTECH Services, Inc.
P.O. Box 875, Forest, VA 24551
Phone/Fax: (804) 525-4638
e-mail: simserv at inmind.com
Web site: http://members.aol.com/simserv/INDEX.HTM
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