[Milsurplus] [ARC5] BC-221-J vs BC-221-T or what?

[Kenneth G. Gordon]

Both of my BC-221-AKs are mounted in wooden cases. Both have their 
properly serial-numbered calibration books. 

Both have a special compartment in the rear bottom for a power supply. One 
had a home-brew supply which is very small but seems to work just fine.

The other had no power supply when I got it.

Both of mine have the calibration capacitors behind the nomenclature plate 
on the front. Removing the plate (4 screws) reveals a screw-driver 
adjustment slot facing the front.

Neither unit came with the Bristo (sp?) wrench, but at least one came with 
spare tubes and a spare crystal.

I've used them for help with aligning receivers. I set one at the top end of the 
band to be calibrated and one at the bottom.

There is some drift from turn-on to fully warmed up, but it seems to be very 
little.

Zeroing it to 10 MHz WWV is simple and reliable. Once allowed to warm up 
for 30 minutes, it is and remains zero-beat with WWV.

The Modulation works perfectly and is a big help when aligning receivers.

Ken W7EKB