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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This observation is based on a photograph that appeared in Mwnual magazine in the s. Certainly, some of the late SXs have a louvered condenser box cover though it was mounted with screws not clip-on.
Roaring 20s Radios to It is probable that the ratio of assignment of serial numbers to SXs compared to other equipment increased.
When WWII ended in August,Hallicrafters almost immediately started civilian production of several pieces of equipment that had formerly been for the military. Location and orientation of Auxilary Stand-by Switch outlet looks like AC receptacle changed when fuse holder is mounted to rear chassis – initially, located above the Phono Input jack with horizontal orientation – later moved next to fuse holder with vertical orientation.
During WWII, Hallicrafters’ output again increased significantly, however the nature of the production changed from amateur receivers and transmitters to equipment required by the military. Please use PayPal for sending a donation by clicking on the “Donate” Button below. Most of these surviving records are probably in private collections. Probably to compensate for gain changes due to single RF amplifier on Bands 1 and 2 and high frequency gain roll-off on Band 6.
Who would have made the white non-OEM dials? Sometimes addemdums turn-up, so Hallicrafters was attempting to keep their documentation current.
The RBY-1 was an earlier, military version of the S For comparison, the bottom photo shows a reproduction bright-white dial. These SXs were installed in automobiles with a directional loop antenna on top of the roof.
Amplified AVC transformer has added 25pf capacitor in parallel with secondary to prevent oscillation. The manual hallicragters 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.
Hallicrafters SX-28-A Technical Manual
Never let excessive moisture get on the front of either of the dials or the meter scale. At about the same time, the magnet cover was eliminated from the speaker frame.
Here is a list of some of the common mods you might encounter – and have to remove – in the SX or SXA receivers.
Manual updated with new schematic and under chassis photos to reflect recent updates from – Part values are shown for capacitors inside IF transformers in hallicrafters schematic – This manual probably dates from August the previous updated manual was dated Aug and the initial manual was dated Aug Approximately SXA receivers were produced with the “A” designation on the front panel.
Latest SXA serial number encountered: A small donation will help with the expenses of website operation, which includes research, photographing and composition.
Over the years, the silver fill paint will have discolored with smoke and other “grunge” so that it might look “smoky-white” but – look closely – it is actually silver.
The BFO section is to the right of the 6V6s. It is a more specialized commercial-military communications receiver in that it doesn’t tune the AMBC band or M. No serial numbers have been reported assigned to SXs from the Hxxx range. The early SXs had a problem with the red ink used that results in the indicators fading to the point of invisibility. The version I saw also had a buffer circuit assembly on the antenna input to allow multiple receivers to use a single antenna.
Additionally, there will be several inspector stamps or initials. Although H left the Hallicrafters’ plant in Februaryit was actually civilian purchase.
This would bring the total SX production to about 16, receivers, hallcirafters, pre-war SXs plus 10, built during the war for a total of 16, receivers. The Plug-in coil assemblies were part of what gave the HRO its low-noise figure but they are a hassle to store when not in use and changing bands is a pain.
Click here to go to Peter W. Fortunately, it was “dead-stock” with no modifications and the receiver had only one serious problem. The bulletin continues that since you have removed the 6H6 ANL Rectifier tube, now you can use that tube socket to add a 6SL7 cathode follower for a panoramic adapter or oscilloscope – however, the connections are to the last IF amplifier stage where the IF selectivity will severely limit the bandwidth of a panoramic adapter display use the link below to read about the correct method of connecting a Panadapter to the SX Also, I install the electrolytics inside the original cans.
It is all original parts with the exception of the S-meter load resistor. Titled as “Service Bulletin from Hallicrafters – Bulletin ,” it consists of four pages printed on two sheets of yellow paper. M odifications or Upgrades The SX is a great receiver – but it was designed in and, as such, its performance is dated when compared to a modern receiver’s performance.
A close-up of the 2nd RF coil assembly from an SX removed for rebuilding. Tone hallcrafters – although one can reduce high frequency audio by limiting the bandwidth on the Super-Pro, the HRO has no tone manjal. Since there is no tone control on the Series Super-Pro other than cutting the highs by reducing bandwidth, the better the speaker quality is, the better the audio will sound. The early SX gearbox will have two separate gear trains that operate the main tuning and the bandspread dials.
When all of the screws are installed and tight, the SX chassis is rigidly mounted and the cabinet can be “jarred” with very little if any frequency change resulting.
Any Hallicrafters inspection tag information – these are paper-wire tags that are attached by twisting the wire wrapper onto the power cord.
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 hallicrfaters myth. Army Signal Corps and U. The R receivers do not use the standard Hallicrafters serial number metal tag and do not use the HA serial numbers.
Most companies used this time for design and tooling changes along with new product introduction.