Hallicrafters SX Serial Number H Here is the SX, as received. Chuck McGregor drew the following schematic, showing where the cut was, and . View and Download Hallicrafters SXA technical manual online. SXA Radio pdf manual download. View and Download Hallicrafters SX service instructions manual online. The Model SX Super Skyrider Receiver. SX Receiver pdf manual.
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It was possible that a 6AC7 RF stage could oscillate under certain conditions which weren’t entirely predictable by Hallicrafters.
HALLICRAFTERS SX SERVICE INSTRUCTIONS MANUAL Pdf Download.
Originally, the wire screen grilles were flocked with a yallicrafters colored mohair but this seldom survives today. On the down-side, the very early SXs have a slightly less effective version of the Lamb Noise Silencer and an Antenna Trim that only functions on the top four bands. Build Your Own Hallicrafters R Front panel ballicrafters changed to medium black – end oflatest SN seen with gray panel, H and earliest SN seen with black panel, H – Only 26 serial numbers separate this particular change, dating it to Dec.
Who would have made these dials? The early SXs used hex head screws to mount the halicrafters chassis. Twelve Hallicrafters’ engineers were assigned the project of creating a receiver that not only satisfied government and commercial users but also gave the hams a receiver that performed better than any previous Hallicrafters.
Hallicrafters SX-28-A Technical Manual
It will look like new. Roaring 20s Radios to Additionally, these receivers have the dial string drive on the bandspread dial. Manual updated with new schematic and under chassis photos to reflect recent updates from – Part values are shown for capacitors inside IF transformers in new schematic – This manual probably dates from August the previous updated manual was dated Aug and the initial manual was dated Aug SX SN H left the Hallicrafters’ plant on October 29, – about two months after the SX introduction and most likely from the second production run.
While it might be possible to leave the coil chassis mounted and try to remove each fiber board to access the capacitors, it is easier in the long run to just remove both RF chassis, along with the Mixer chassis, for capacitor replacement.
Hallicrafters decided to end the “H” prefix and start a new “HA” prefix with numbers beginning at Since the dials were photosensitive, you probably will find that the part of the dial that was exposed to light through the dial glass will be much darker than the unexposed sections.
Each operator would be using earphones to prevent listening interference to an adjacent monitoring station. The production SX never used white dials, despite what you may read elsewhere.
Moderate darkening of the dial. If the gearbox is the old style then proceed to the bandspread side which is more or less identical to the main tuning side. It is very likely that intermixed stock accounted for this interesting anomaly and in a “production environment” this would be considered a common occurrence. Although there are some restorers that believe that white plastic was original to the SX, this is an erroneous assumption based on the “White Dial” myth.
Many sellers do take the time to carefully macro-photograph the tags or ID plate and this is invaluable information that is easy to retrieve. The known evidence – an apparent absence of any authentic examples – leads one to conclude that the use of WWII vintage white dials on an SX is a myth. Resetability of the dial to a known logged frequency is hqllicrafters, however the dial is not illuminated.
Hallicgafters is the bandspread which is only calibrated in a scale and only operates on the top three bands. The front panels were never jet black with white nomenclature. This is the earliest SX inspection tag that has turned up so far. This same color was used on many Hallicrafters’ cabinets, manua the SR. The front panels are “dark” gray-blue on very early SXs. The typical FCC receivers had a metal tag mounted on the front panel or on the nanual of the receiver for FCC identification.
An interesting advertisement in August QST seems to confirm that the SX did not account for a large percentage of orders. It is known that some of the very late SXs were fitted with webbed knobs.
This manul make the actual time interval between the assignments of HA and HA about two weeks. One has to remember, inmost hams were on M to 20M, so the SPX satisfied the majority of the ham’s frequency requirements. Amplified AVC transformer has added 25pf capacitor in parallel with secondary to prevent oscillation.
The front panel color was changed to a “charcoal” black in December and remained that color until late when the new, heavily textured front panel was introduced on some of the last SXs produced. There are three date-coded parts used in the pre-war SX that provide specific information as to when the part was made.