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ah.4.4. SB-102-4: LMO Instability
March 30, 1973
SB-102 Bulletin No:SSB Transceiver SB-102-4
We have a possible cure for some of the LMO instability problems in the SB-102. The
following should help eliminate any stress on the LMO chassis when installed on the
main chassis.
Remove and discard the lock washers & nuts used to mount the LMO to the chassis.
Use instead a #6 flat washer [PN 253-25] & hex lock nut [PN 252-27] at each lug,
tightening each lug A TURN AT A TIME in a criss-cross pattern.
We recommend this be done on all SB-102 units in for service even if customer has no
complaints about LMO.
ah.4.5. SB-102-5: Low 40 Meter Output
October 29,1973
SB-102 Bulletin No:SSB Transceiver SB-102-5
1. REMOVE the 1-1/2" bare wire from hole 1 on the DRIVER PLATE circuit board & the
ground foil of the RF DRIVER board.
2. Connect a 3/4" bare wire between the ground foils of these same two boards.
3. REMOVE the 1-3/4" bare wire from hole 1 in the DRIVE GRID circuit board & the
ground foil of the RF DRIVER board.
4. Connect a 3/4" bare wire between the ground foils of these same two boards.
5. Remove the 2-3/4" bare wire which ties the ground foils of the circuit boards to the
shields.
6. Remove the coil cover. Then REMOVE four of the light spring clips & their hardware
as shown:
NOTE: the pictorial shows removal of the set of clips & hardware located directly
down from the 2 holes in the cover; the other set to be removed is directly across
and down from the 3 holes in the cover.
7. Readjust the driver grid & drive plate coils as instructed on page 102 in the SB-102
manual.
SB-102 Service Bulletins Page 176
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