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.

------------------------------------------------------------------------------------------------------------------
                                                        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)     "      "            "           "

-----------------------------------------------------------------------------------------------------------------
                                                        NOVEMBER 1, 1967
SB-101                                          Bulletin No:
SSB Transceiver                                 SB-101-3D

                                                          Improper Tuning

SEE BULLETIN NO. HW-100-1D DATED NOVEMBER 1, 1967.

-------------------------------------------------------------------------------------------------------------------
                                                           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.

--------------------------------------------------------------------------------------------------------------------
                                                          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
-------------------------------------------------------------------------------------------------------------------
                        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
-------------------------------------------------------------------------------------------------------------------
                        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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