[Hallicrafters] re: Hallicrafters SX-16 Project

[Wj5mh at aol.com]

On June 21st I sent out a note telling of my pending SX-16 project, and after 
a busy summer, I'm ready.  Old Jack sent a cautionary reminder about the pwr 
and the audio output transformers, and guess what...  The audio out 
transformer has already been replaced in this rig with a Stancor A-3890 universal audio 
output.  (P-P primary is from 4K to 14K ohm, 50ma, 15 watts, and the secondary 
is 1 to 30 ohm.)  So, it looks like someone already tried to run it without a 
load...ha.

I haven't been able to find the secondary color code, but I think I have the 
correct combination of output wires to make it work.  The previous user may 
have been one wire off to get an approximate 8 ohm output, but I can't be sure.

I've added a fuse in the AC transformer primary, and may add one to the 
center tap lead of the secondary where the standby/receive switch is.

I've checked the power and IF transformers for continuity, but since the 
radio has had some questionable work done on it in the past, I will be taking a 
closer look at the circuitry while I wait for new caps to arrive.  T5 seems to 
be OK, also.

C-30, cathode bypass for the 1st 6K7 IF, had 2 ea .25 mf caps in parallel 
rather than just one .25 as shown in the schematic.  Both caps are exactly the 
same and look like factory.  Any idea there?

The S-meter has a strap around it, because of the common problem with the 
case splitting.

I'm still interested in hearing details of your SX-16 or 17 project.

Thanks,
Joe