Wireless of the Week - week 22

[Chris Suslowicz]

Originally Posted by Jesse Browning

Chris; does your reference give the values of the different resistors? I made a No.190 box out of a No 3 box using the wiring diagram on the lid of the main electrical junction box in the radio compartment. It doesnt give the value of the resistors. What I would prefer is an original No.190 box.

Ah, there are actually two resistors on the top switch, and 4 on the Normal/Rebroadcast switch (those are identical on 3A, 3B and 190).

The two new ones on the 190 are

17 - 1/4 W. Metallized 5,600 ohms +/- 10%
19 - 1/2 W. metallized 270 ohms +/- 10%

(Numbers are on the parts layout drawing, not component numbers.)

I wonder if there's a circuit diagram for that box in the other EMERs.

More later...

...sorry, we don't appear to have a circuit diagram of the control unit with component values. It's not in the 'First Echelon Work" EMER, which is all about operator and electrician maintenance, and the "2nd - 4th Echelon Work" just covers the set internals in extreme detail - nothing about control units.

Chris.