Heathkit Service Bulletins - SB-101 (Complete)
Joseph W Lutz
joelutz at JUNO.COM
Mon Jul 21 23:43:33 EDT 1997
June 12, 1967
SB-101 Bulletin No:
SSB Transceiver SB-101-1D
Driver Oscillates on 40 Meters
Remove C-924 [.02 disc capacitor] from across 150K ohm resistor & delete
from circuit.
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November 1, 1967
SB-101 Bulletin No:
SSB Transceiver SB-101-2D
Switch Action
Improvement
DELETE: (2) 253-67 (2) WASHER, .186OD, .054 THICK (1 EA FOR 100-445)
ADD: (2) C253-67(1) " " " " "
(FOR 100-445)
ADD: (2) B255-79(1)SPACER, 1/8 SHOULDER, THREADED
ADD: (2) A263-7 (1)FOOT, FELT, 1/8" THICK
DELETE:(4) 266-91 (1)ACTUATOR, SLIDE SWITCH
ADD: (4) 266-97 (1) " " " "
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NOVEMBER 1, 1967
SB-101 Bulletin No:
SSB Transceiver SB-101-3D
Improper Tuning
SEE BULLETIN NO. HW-100-1D DATED NOVEMBER 1, 1967.
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APRIL 18, 1968
SB-101 Bulletin No:
SSB Transceiver SB-101-4D
Improper Tuning
on 40 Meters
Description of Change:
DELETE: (2) B21-31 (50) CAPACITOR, DISC .02 MFD Z5U
ADD : (2) B21-31 (49) " " "
" "
DELETE: (4) 85-131-1 (1) PC BOARD, RF DRIVER MIXER
ADD : (4) 85-131-1 (1) " " "
"
REMOVE: C-424 installed across R-401
NOTE: SBM-100-1 called for the installation of this capacitor on SB-100
units. This capacitor should now be removed.
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June 3, 1968
SB-101 Bulletin No:
SSB Tranceiver SB-101-5D
Grounding Problems on
Tranceivers
A quality of factory wired transceivers have been shipped with loose
rivets both at the rear phono sockets & at the final tube sockets.
This is causing a serious grounding problem. Corrective recommendations
are shown on the attached sheet:
[[[[[[[[[[[[[NOTE: IF MY INTERPRETATION IS NOT CLEAR - PSE LET ME
KNOW]]]]]]]]]
Illustration shows the installation of a ground buss for the rear panel
phono sockets. It also states that if the final tube socket rivets are
loose, they should be drilled out & eplaced with 6-32 hardware.
-------------------------------------------------------------------------------------------------------------------
November 25,
1970
SB-101 Bulletin No:
SSB Transceiver SB-101-1
Meter Zeroing
Original 10-147 control tolerance not sufficientto allow zeroing in all
units. This part is being respecified to a closer tolerance. In the
meantime, any field problems requarding zeroing of the meter can be
corrected as follows:
Change: R-107 from 100K Ohm to 82K Ohm (1-159).
-------------------------------------------------------------------------------------------------------------------
September 14, 1972
SB-101 Bulletin No:
SSB Transceiver SB-101-2
Repeated Heterodyne Oscillator Failure
Change: R-212 from 220 Ohm to 330 Ohm 1/2 Watt resister (1-4).
--------------------------------------------------------------------------------------------------------------------
May 23, 1974
SB-101 Bulletin No:
SSB Transceiver SB-101-3
SB & HW Series Audio Amplifier & VOX
Circuit Trouble Shooting Guide
SEE BULLETIN NO. SB-100-3 DATED MAY 23, 1974
------------------------------------------------------------------------------------------------------------------
May 23, 1974
SB-101 Bulletin No:
SSB Transceiver SB-101-4
Diode Leakage in The SB-100, SB-101,
HW-101
SEE BULLETIN NO. SB-100-1 DATED MAY 23, 1974
-------------------------------------------------------------------------------------------------------------------
May 23, 1974
SB-101 Bulletin No:
SSB Transceiver SB-101-5
SB & HW Series Instability & Corrective
Information
SEE BULLETIN NO. SB-100-4 DATED MAY 23, 1974
--------------------------------------------------------------------------------------------------------------------
May 23, 1974
SB-101 Bulletin No.
SSB Transceiver SB-101-6
Alternate Method of Neutralizing The Final
Amplifiers
SEE BULLETIN NO. SB-100-2 DATED MAY 23, 1974
--------------------------------------------------------------------------------------------------------------------
December 18, 1974
SB-101 Bulletin No.
SSB Transceiver SB-101-7
Oscillations or Low Drive
SEE BULLETIN NO. SB-100-5 DATED DECEMBER 18, 1974
--------------------------------------------------------------------------------------------------------------------
May 2, 1975
SB-101 Bulletin No.
SSB Transceiver SB-101-8
Self Oscillations Occurring After Installation
of Steel Comb Brackets
SEE BULLETIN NO. SB-100-6 DATED MAY 2, 1975
--------------------------------------------------------------------------------------------------------------------
March 29, 1976
SB-101 Bulletin No:
SSB Transceiver SB-101-9
S-Meter Drift
See Bulletin No. HW-101-10 Dated March 26, 1976
------------------------------------------------------------------------------------------------------------------
November 15, 1976
SB-101 Bulletin No:
SSB Transceiver SB-101-10
Low Receiver Sensistivity
See Bulletin No: HW-100-7 Dated November 15, 1976
------------------------------------------------------------------------------------------------------------------
February 22, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-12
Tuning Erratic
See Bulletin No: SB-100-9 Dted February 22, 1978
------------------------------------------------------------------------------------------------------------------
June 5, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-13
Relays Remain Energized After Transmit Condition
See Bulletin No: HW-100-9 Dated June 5, 1978
------------------------------------------------------------------------------------------------------------------
June 5, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-14
Poor AGC Action
See Bulletin No: HW-100-10 Dated June 5, 1978
------------------------------------------------------------------------------------------------------------------
June 5, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-15
100KHZ Calibrator Spurs
See Bulletin No: HW-100-11 Dated June 5, 1978
--------------------------------------------------------------------------------------------------------------------
July 24, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-16
LMO Drift; Intermittent Frequency Shift
See Bulletin No: SB-100-13 Dated July 24, 1978
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July 24, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-17
Poor Preselector Tracking
See Bulletin No: HW-100-13 Dated July 24, 1978
-------------------------------------------------------------------------------------------------------------------
July 24, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-18
Carrier Nulls With IC14 Trimmer Plates Completely Meshed
See Bulletin No: HW-100-14 Dated July 24, 1978
-------------------------------------------------------------------------------------------------------------------
August 7, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-19
Relays Chatter In VOX Mode
See Bulletin No: HW-100-15 Dated August 3, 1978
------------------------------------------------------------------------------------------------------------------
August 7, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-20
Loading Capacitor Turns As Plate Capacitor Is Rotated
See Bulletin No: HW-100-16 Dated August 3, 1978
-------------------------------------------------------------------------------------------------------------------
August 7, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-21
"Chirping" And Slow Receiver Recovery
See Bulletin No: HW-101-32 Dated August 3, 1978
-------------------------------------------------------------------------------------------------------------------
August 22, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-22
S-Meter Drift
See Bulletin No: HW-100-17 Dated August 22, 1978
--------------------------------------------------------------------------------------------------------------------
September 26, 1978
SB-101 Bulletin No:
SSB Transceiver SB-101-23
Poor IF Sensitivity
See Bulletin No: HW-100-19 Dated September 26, 1978
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April 25, 1979
SB-101 Bulletin No:
SSB Transceiver SB-101-24
Low Power Output; Poor Vox Sensitivity
See Bulletin No: SB-100-21 Dated April 25, 1979
-----------------------------------------------------------------------------------------------------------------
September 20, 1979
SB-101 Bulletin No:
SSB Transceiver SB-101-25
Low Transmitter Output; Low Receiver Sensitivity
When cleaning the unit during prework [tube sockets, potentionmeters,
etc.], don"t overlook the SSB/CW filter slide switch located with the RF
gain control. This switch handles both transmit and receive signals and
dirt and grease build-up can affect the performance of both functions.
--------------------------------------------------------------------------------------------------------------------
That's all I have for the SB-101.
73 de JOE- - - - - - - - - - -W7LPF/4 (NNN0KUU)- - - - - - - - - - - - -
- -QWCA - NCVA - SOWP - FISTSGordonsville, Va 22942 (Orange
County)Looking for: Heathkit HR/HX-20, MR/MT-1,
Central Electronics 100V or 200V- - - - - - - - - - - - - - - - - - - - -
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