The photograph on the left is of the bottom of the receiver with the bottom cover removed. This picture was taken before any of the restoration process had begun. This Hallicrafters S-22R was just slap full of cobwebs and insect remains. It must have sat on a shelf or up in an attic for many years before it found its way here. The picture on the right is of the inside front right hand corner of the receiver. The big brown thing that the red arrow is pointing at is actually the factory 5 inch speaker.
In order to do an alignment on this receiver the technician will need four basic service tools. These items include a full wave signal generator which must cover the frequency range of the S-22R including 1.6 MHz, some way to connect a VTVM(Vacuum Tube Volt Meter) or some other output indicating meter to the headphone jack, a non-metallic screw driver and a dummy antenna. The dummy antenna is nothing more than a .0002 MFd capacitor(0.0002 uF, 0.2 nF, 200 pF, 200 MMFd, 200 uuF = same thing) for bands 1 and 2, and a 400 ohm non-inductive resistor for bands 3 and 4.
The first step in the alignment procedure is to turn on the receiver and the signal generator and allow each of them to warn up and stabilized. Around a half an hour will often suffice. The next step is the proper setting of the controls on the front of the receiver. Set each of the controls as follows, tone control at maximum high frequency position, the AVC and BFO is turned off,.RF and AF gain is set at maximum.
There are normally at least two alignments that must be preformed on a receiver. It is important to always do the IF alignment first and the RF alignment last. This receiver is no different and the IF alignment is preformed first. The IF of this receiver is 1600 Kc or 1.6 MHz. This is some what of an odd ball IF as many receivers have an IF of 455 Kc. Why is knowing the IF frequency important? Well, you must know the IF frequency of the receiver before it can be properly aligned.
The next step after we have completed the above is to set the band switch to position 3 and tune the receiver to 5.0 MHz. Tune the signal generator to 1.6 MHz. Now connect the hot side of the signal generator to 6K8 grid cap through .01 MFd capacitor and place the ground of the signal generator to the chassis. Using the non-metallic screw driver, simply adjust screws S1 through S6 that are found on IF transformers T1, T2, and T3 for maximum gain. These transformers are located on the top of the chassis and all six screw heads point towards the rear of the receiver. That's it, you are done!! That is all there is to doing the alignment of the IF section on this receiver.
WAIT, don't change the settings on that signal generator just yet. While it is still set to deliver a signal on 1.6 MHz we might as well check the BFO adjustment. With the 1.6 MHz signal being fed into the IF amplifier of the receiver, turn on the BFO switch and place the Pitch Control knob with the white dot strait up. Now adjust screw S7 that is located on the top of transformer T5 for a zero beat. Transformer T5 is located on the top of the chassis. That's it, you are all done with this adjustment. Now the Pitch control is centered and you will be able to vary the frequency of the beat note to your complete satisfaction.
The RF alignment is just as easy but a touch more tedious. It involves changing the frequency of the receiver for each band and matching this frequency with the signal generator. There will be a total of eight frequency changes that will need to be made, two for each band. One thing to keep in mind is that it is some times helpful to run through each band a second time for a final tweaking which will yield superior receiver performance before moving on to the next band.
Lets begin, set the receiver controls as stated above and switch the receiver to band 1. Next, tune the receiver and signal generator to 125 Kc. Connect the hot lead of the signal generator to antenna connection A1 using a .002 MFd capacitor and place the ground of the signal generator on the chassis. A jumper between antenna connection A2 and G should be installed.
Now adjust P1 which is located under the chassis for the strongest signal on the VOM. While the receiver is still on band one, it is time to align the other side of the dial. Tune both the receiver and the signal generator to 350 Kc and adjust capacitors CC, CA and CB, which are located underneath the chassis for the strongest signal on the VOM.
For band 2 we need to tune both the receiver and the generator to 450 Kc and adjust P2, which is located on the top left side of the chassis for the strongest signal on the VOM. As before it is now time to adjust the other side of the dial on band 2. Tune the receiver and generator to 1.4 MHz and adjust capacitors CF, CE and CD which are located underneath the chassis for the strongest signal.
It is now time to remove the capacitor that is connected to antenna terminal 1 and replace it with a 400 ohm resistor. Put the receiver on band 3 and tune it and the generator to 2.0 MHz. Now adjust P3 which is located on the top of the chassis for the strongest signal on the VOM. Next we need to tune the receiver and generator to 4.5 MHz and adjust capacitors CJ, CG and CH, which are located underneath the chassis for the strongest signal on the VOM.
Hang in there as we are now on the home stretch and are just about done. The next to the last step begins by switching the receiver to band 4 and adjusting it and the generator to 7 MHz. With this done, we now need to adjust P4 which is located on the top left side of the chassis for the strongest signal on the VOM. The last step in our RF alignment is to tune the receiver and generator to 15 MHz and adjust capacitors CM, CL and CK, which are located underneath the chassis for the strongest signal on the VOM.
All of the adjustments above will need to be done with the non-metallic screw driver. For safety reasons, do not preform this work alone or if you are tired. It is not worth your life.
Radios by Hallicrafters with Price Guide by Chuck Dachis
Hallicrafters owners manual
Sam's photofacts by Howard W. Sams & Co., Inc.