HEATHKIT SERVICE BULLETINS - CONT.

[Joseph W Lutz]

HI GANG,

     Continuing with the SB-102 Transceiver:

-------------------------------------------------------------------------------------------------------------------
                        March 23, 1973
SB-102                                          Bulletin No.
SSB Transceiver                                 SB-102-3

                           Low Grid Drive - Alignment Problems

This has been related to the differences [internal electrode capacitance]
between Tung-Sol & RCA 6146's.  Purchasing has ceased buying Tung-Sol
tubes; all new stock since late 1972 will be RCA's which give better
performance.  In addition, an additional alignment sequence is being put
into the manuals which insures adequate gride drive -- previous tune-up
was done in receive only where the peaks were broader than required for
transmitter tuning.  The new procedure uses the receiver sequence to get
in the "ball park"; the added sequence peaks for maximum grid drive.

The following modifications to the manual will helpavoid the many
questions:

PAGE 103:  8th step, right column, last two sentances:

 Then turn the meter switch to GRID [grid current].  The meter should
have some up-scale indication.  The meter may read as much as full scale
-- this is normal.

PAGE 104: left column #2:

Turn the meter switch to GRID & adjust the MIC/CW LEVEL control for a
grid current reading, just enough so a peak may be seen when making the
adjustment in the next step.

PAGE 104:  Right Column #4 - will be deleted.

PAGE 119:  Right Column #14 - will be deleted.

----------------------------------------------------------------------------------------------------------------
That's it for now -- got to watch game 5.  Ciao!

73 de JOE
- - - - - - - - - - -W7LPF/4 (NNN0KUU)- - - - - - - - - - - - - - -
QWCA - NCVA - SOWP - FISTS
Gordonsville, Va 22942 (Orange County)
Looking for:  Heathkit HR/HX-20, MR/MT-1,
              Collins 516F-2, 312B-4, EFJ TR Switch
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -