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I purchased this set from another collector in August, 2009. My set included a DY-44 dynamotor, which allows the set to be powered fomr a 24VDC source. I’ve traded the J-72/GR terminal box (shown below) for a CH-291 battery box (not yet shown here). Rather than using original BB-54 wet cells, I installed six 6V gel cells (in parallel) in the box.
The set can use either an antenna whip which attaches to a swivel mount on the back of the transceiver, or a remote whip antenna. I have the J-72/GR matching unit which allows this radio to be used with an AB-15 antenna mast base, but I hope to get my hands on the correct built-in whip.
The SCR-619 set could be vehicle-mounted or carried on a special pack frame. In vehicular installations, the set would include Battery Charger PE-219, two each Battery Box CH-291, Mounting FT-506, and Terminal Box J-72/GR.
I hope to obtain the necessary accessories for a comple portable set. I’m missing the whip antenna used for man-portable use, but I can still use the set at a fixed location with standard AB-22/23/24 whip elements which screw into the mount on the rear of the transceiver. I’m also missing the rare FT-505 pack frame mount. I was able to borrow one of the few known ones for a while to photograph it, and I created a solid model of it in case I ever find the gumption to have replicas manufactured.
Schematic Diagram
Here is the BC-1335 schematic diagram from my April, 1945 printing of TM 11-879, scanned at 600 DPI, with and without some added annotations:
BC-1335-schematic-annotated.pdf (771k bytes)
Pictures
An overview of the kit that I bought. Not shown here are an AB-15 mast base and a set of whip elements which also came with the set.
Aren’t these sets great? I have a BC-1335 that is different from any other I have seen. In the spot where the spare vibrator usually is, this one has a toggle switch with 2 positions, marked ‘vibrator’ and ‘BA-70.’ The BA-70 goes in the battery box that the BC-1335 clips on to, but the power connector on the BC-1335 has 3 conductors: negative, + 6V and +12 V, whereas the battery box connector has, I believe, 5 conductors. Does this make sense to you?
I’ve just learned about the larger CY-740/PRC dry battery box (vs. the original smaller CH-191 wet cell box that I have), after getting a post-WW2 MT-702/U packboard mount that’s made to hold it and a BC-1335. I was told that the newer BC-1335 version that worked with the dry battery box had another connector added to the front panel for the battery input, though. A Google search turned up this page that shows the new connector at the upper right corner of the front panel. Does your “different” BC-1335 have the additional connector?
No, it does not. By the way, have you had success with the bias batteries? In case you are not aware, the bias batteries used back then were mercury. Nowadays, the button battery substitutes are alkaline, with reversed polarity. If you study the retainer clips, you will see that the alkaline cannot be used in the retainer, for they will not be in series. I had to remove the clip assembly and reverse the leads.
Also, the green eye will light without the bias cells in place, but I don’t know if tuning will be accurate.
I haven’t replaced the bias cells in my BC-1335. They’re only used as a reference voltage for calibrating the magic eye tube, and have no other effect on the radio’s operation. I just used a bench supply set to 0.4V as a reference in place of the bias cells while tuning up the radio on the bench.
I think I need new glasses! I took another look at that set, and there was the special connector for BA-70 use, in the upper right hand corner. By the way, I tuned the radio a week ago, and earlier today I bought a 6 volt auto battery and rewired my power cord to run the set off 6 volts. It powers up and there is the rushing noise in the earplugs, but now I have no side tone when I transmit. Frustation!
I,ve got a minty n.o.s. PE-219 battery charger I’m willing to sell at a reasonable price (I haven’t got an idea of the value).
Let me know if anybody is interested.
Grtz Moos