Heathkit SB-10 Series Troubleshooting Manual page 9

Table of Contents

ag.1.3.Matching Heathkit Paint: Part 3................................................................................................................135

ah)HW-101 and SB-10x Service Bulletins.................................................................136

ah.1.HW-101 Service Bulletins...........................................................................................136

ah.1.1.HW-101-1: VFO Drift................................................................................................................................ 136

ah.1.2.HW-101-2: Repeated Heterodyne Oscillator Tube Failure Inadequate USB-LSB Frequency Shift.........136

ah.1.3.HW-101-3: Carrier Null Control Failure....................................................................................................136

ah.1.4.HW-101-4: Low Output on 40 Meters.......................................................................................................136

ah.1.5.HW-101-4: Low Output on 40 Meters.......................................................................................................137

ah.1.6.HW-101-5: Alternate Method of Neutralizing the Final Amplifiers............................................................137

ah.1.7.HW-101-5: Alternate Method of Neutralizing the Final Amplifiers............................................................137

ah.1.8.HW-101-6: SB & HW Series Audio Preamplifier & VOX Circuit Troubleshooting Guide..........................138

ah.1.9.HW-101-7: SB & HW Series Instability & Corrective Information.............................................................138

ah.1.10.HW-101-8: Oscillations or Low Drive......................................................................................................138

ah.1.11.HW-101-9: Self Oscillations Occurring After Installation of Steel Comb Brackets.................................139

ah.1.12.HW-101-10: S-Meter Drift....................................................................................................................... 139

ah.1.13.HW-101-11: Low Receiver Sensitivity....................................................................................................139

ah.1.14.HW-101-12: Improperly Manufactured 6HS6 Tubes..............................................................................139

ah.1.15.HW-101-13: Germanium Diode Change................................................................................................139

ah.1.16.HW-101-14: Improve ALC Adjustment...................................................................................................140

ah.1.17.HW-101-15: Driver and Mixer Switch Shields Will Not Take Solder.......................................................140

ah.1.18.HW-101-16: Side Tone Too Loud...........................................................................................................140

ah.1.19.HW-101-17: Transceiver Oscillates In Transmit With the Mic Keyed.....................................................140

ah.1.20.HW-101-18: RF Choke in Final Plate Circuit Overheats or Difficult to Neutralize on 10 Meter & 15 Meter

Bands............................................................................................................................................... 141

ah.1.21.HW-101-16: VFO Shift............................................................................................................................ 141

ah.1.22.HW-101-20: Low Power Output, S-Meter Drift, Etc................................................................................141

ah.1.23.HW-101-21: Distorted Audio, No Carrier Null or Erratic Power Output in Voice Mode..........................141

ah.1.24.HW-101-22: Relative Power Meter Pegs on 15 And 10 Meter...............................................................142

ah.1.25.HW-101-23: Relays Remain Energized After Transmit Condition..........................................................142

ah.1.26.HW-101-24: Poor AGC Action................................................................................................................142

ah.1.27.HW-101-25: 100 KHz Calibrator Spurs..................................................................................................142

ah.1.28.HW-101-26: Receiver Recovery Slow....................................................................................................143

ah.1.29.HW-101-27: Erratic VFO Tuning............................................................................................................143

ah.1.30.HW-101-28: Carrier Nulls with C14 Trimmer Plates Completely Meshed..............................................143

ah.1.31.HW-101-29: Poor Preselector Tracking..................................................................................................143

ah.1.32.HW-101-30: Poor Preselector Tracking..................................................................................................143

ah.1.33.HW-101-30: Loading Capacitor Turns as Plate Capacitor is Rotated....................................................144

ah.1.34.HW-101-30: Loading Capacitor Turns as Plate Capacitor is Rotated....................................................144

ah.1.35.HW-101-31: Relays Chatter in VOX Mode.............................................................................................144

ah.1.36.HW-101-32: "Chirping" and Slow Receiver Recovery............................................................................144

ah.1.37.HW-101-33: ALC Meter Reads Below Zero...........................................................................................145

ah.1.38.HW-101-34: S Meter Drift....................................................................................................................... 145

HW & SB Series Manual

Page 9

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