Heathkit SB-10 Troubleshooting Manual

frequency operation (within the same band). 2021/1/9: Significant cleanup work on MS Word’s handling of list numbering 2021/1/8: Added instructions for confirming bandpass filter response using sweep generator and a couple of photos of one radio’s response for reference. 2021/01/01: Added Transmit RF Signal level measurements. 2021/01/01: Added addit ...

a)History of the HW-101................................................................................................14 a.1.The SB-series and HW-series (Wikipedia)....................................................................15 a.2.Comparison of Various Models.....................................................................................16 a.3 ...

 also be used)..................................................................................................................32 A 50 nonreactive dummy load that is capable of 100 watts dissipation, such as  the Heathkit Model HN-31. Do not use light bulbs as a dummy load, as their resistance varies radically with voltage.................................................... ...

s.2.2.Driver Neutralization Adjustment..................................................................................................................38 s.3.LMO Shifter Adjustment.................................................................................................39 t)Uneven Response Across the ...

x.2.Summation......................................................................................................................60 y)Heathkit “S” Meter Circuit.........................................................................................61 y.1.“S” Meter vs. AVC Voltage....... ...

drive arm mounting screws and move the dial pointer drive arm base down until the dial pointer is at the "5" marking. Retighten the screws....................................71 ab.1.1.Dial Calibration...........................................................................................................................................71 ab.1.2.Re-engaging the Main Tuning ...

ae.1.1.85-127P221 (SB-100, SB-101).................................................................................................................109 ae.1.2.85-127-1 (SB-101)....................................................................................................................................109 ae.1.3.85-127-2 (HW-100, HW-101).... ...

ah)HW-101 and SB-10x Service Bulletins.................................................................136 ah.1.HW-101 Service Bulletins...........................................................................................136 ah.1.1.HW-101-1: VFO Drift................................................. ...

ah.1.40.HW-101-36: Receiver Recovery Slow....................................................................................................145 ah.1.41.HW-101-37: R-940 Shorting To Shield...................................................................................................145 ah.1.42.HW-101-38 ...

ah.1.83.HW-101-79: Driver Stage Oscillates on 15 Meters.................................................................................158 ah.1.84.HW-101-80: Low Transmitter Output Due to Low VFO Output..............................................................158 ah.1.85.HW-101-81: Preselector Capacitor ...

ah.4.5.SB-102-5: Low 40 Meter Output...............................................................................................................176 ah.4.6.SB-102-6: SB & HW Series Audio Preamplifier & VOX Circuit Trouble Shooting Guide.........................177 ah.4.7.SB-102-7: SB & HW Series Inst ...

By K8GNZ (8/2003) The Heathkit HW-101 evolved out of several prior Heathkit models, namely the SB-100, SB-101, SB-102, and the HW-100. To understand the history of the HW-101, one needs to know a little about the history of these prior models and of the Heath Company in general. The Heath Company: The Heath Company was involved in building test equipment and other devices prior to its entry into the amateur radio market. It was the ...

cost of the SB series transceivers. The circuitry and specifications were very similar, but some shortcuts were taken to reduce the cost. These were mainly in the cabinet, the VFO, and the lack of a CW filter. It was produced concurrently with some of the more expensive SB series equipment, being introduced in the late 60's. It was very successful, due in large part to it's ...

had many other features of the S/Line, including crystal bandwidth filters and 1 kHz tuning dial resolution. The S/Line influence was easy to see too, in its cabinet styling, tuning mechanism and knobs. But by designing them as kits and using less expensive construction, Heathkit could offer these units at much lower prices. The pair sold for $590 that first year (equivalen ...

accessed through openings in the right side lower cabinet. The HW series uses a builder assembled VFO with a circular dial and frequency calibrations every 5 KHz. The dial reduction drive consists of two Jackson venier drives. The SB series used a preassembled LMO with a circular dial having calibration marks every 1 KHz. The dial reduction consists of a pinch pulley that engag ...

defective tube(s) eliminated the problem. I experienced this problem in one of my HW- 101s. Turned out both V10 and V11 were both shorted internally. The price of a 6HS6 is a bit steep, $18 (www.vacuumtubes.net price), higher (www.vacuumtubes.net price). Both tubes are available, depends on which outlet you use and whether you are willing to pay $18+ for one tube. I personall ...

What's the difference between an HW-101 and an SB-102? Well, first off, the obvious is the physical appearance (front panel and both top and bottom covers). The HW-101 can only be used with the internal LMO where the SB-102 can use both internal and external LMOs by the flick of a front panel switch. There are differences between the SB-100 and SB-101 LMOs themselves and the power source wiring when compared to the SB-102 LMO and t ...

circuitry and require the same power supply, the HP-23/PS-23 series of power supplies. HW & SB History revised 12/17/2021 Page 20 ...