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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Serial numbers are easy to find, easy to share and they do offer meaningful information when combined with detailed observations of the receiver that the serial number belongs to.

The 10″ Jensen speaker has a ohm to 8 ohm transformer to match the speaker halllicrafters the typical Hallicrafters’ audio output impedance.

Latest SX “H” prefix serial number encountered: From that, one can certainly assume that the receiver was built later than that date. The best solution is to switch off the AVC, increase the Audio Gain to near maximum and operate the receiver’s front end gain manually with the RF Gain reduced to the minimum hallicrfters to copy the desired AM signal. The manual references the color of the wires for placement of the load but unfortunately most SX wiring has darken considerably and it is difficult to tell where the load is placed except by referencing the schematic.

The receiver’s ultimate design was the result of the analysis of more than requested reports, including input from government engineers. There are other minor changes in the wiring harness. The BFO section is to the right of the 6V6s.


The rectifier is reconfigured to operate in series rather than the original shunt arrangement. Short handle, ball-end toggle switches used on SN H – long handle toggles were normally used.


Modifying a vintage classic receiver in an effort to “modernize” its design seems to go against the very idea of preserving and operating vintage equipment in the first place.

The smeared rubber stamped date is “MAR 7. John stated that the SX was “, Also, the main dial has red markers for setting the main dial for bandspread use. Cathode Return Bypass C87 installed on inside front panel by RF Gain control which was moved from chassis mounting to panel mounting – before SN H 1st IF Amplifier Cathode Resistance – Early in production, a switch wafer is added to allow a parallel combination to be switched into the cathode of the 1st IF Amplifier.

It will look like new. It is known that the heavy-textured front panel also made its appearance prior to the introduction of the SXA. If the dials are severely discolored due to smoke and dirt, their appearance may be improved using a “foaming” plastic cleaner.

This is a step-by-step guide that can be followed as you rework the RF box. Variations in output occurred since there was always a rush in the late fall towards Christmas and then a subsequent slowdown in the winter to spring season.

Hallicrafters SX-28

The MFP date should be within a day or so of the final date on the inspection tag that would have been included with the receiver when it shipped. These make clearance between the coils and dividers very tight so care has to be taken to avoid damaging the coils.

This will result in very clean anti-backlash gears that operate correctly. The first few production runs of the SX receivers have a several differences from the later production units. These types of cleaners dissolve the ink almost immediately. It has great a crystal filter for selectivity, which works wonders on either AM or CW, however few amateurs hllicrafters used it enough to appreciate it.


A white card was placed in the photo halliceafters a reference although most monitors have a difficult time reproducing silver colors. If you enjoy using Radio Boulevard – Western Historic Radio Museum’s website as an information resource and have found our photos, our hard to mqnual information or our restoration articles helpful, then please consider a donation to the WHRM website. The mid-production manuals are sometimes dated “” but many manuals at this time weren’t dated at all.

The photo right is H, a mid production SX, showing the typical chassis layout. A special design cam-operated band manul, special tuning and bandspread condensers and twenty lab-tuned coils on Isolantite bases make up the front-end of the receiver. If you don’t have a manual, get one.

H owned by K7MCG.

Hallicrafters SX-28 Service Instructions Manual

WHRM will continue to provide its on-line information source with this website, which has been in operation since The Lamb Noise Silencer is a “tuned noise blanker” that must be aligned to the kc IF to operate correctly.

Wilcox was also known as Wilcox Electric and was located in Kansas City. Front panel texture from up to late will have shallow wrinkles or convolutions. In comparisons with other, later SXA receiver panels, it does appear to be a slightly different color, however more examples of later, post-war SXAs have to be examined to hallicrarters if this color was used after the end of WWII. You will probably find that the SX will have a more accurate dial readout but both receivers have strong, bassy audio with good manuwl and stability.

What about in actual use? All three hallicrfters have been completely rebuilt and aligned.