[Milsurplus] RAL Receiver

[Richard Brunner]

I finally got my RAL fully working, and am reliving my mis-spent youth 
through regeneration.  The last fault was a silver-mica that I put in. 
(gonna throw all of 'em away)  I find it's as sensitive as any receiver 
in the shack, and better than some.

The RAK/RAL power supply was another adventure.  The power transformer 
has input taps for 110, 115, and 120 volts, which is good. (changed to 
120)  The filter has three 3 mfd paper capacitors, and the chokes are in 
the negative lead from the transformer center tap, which is unusual for 
a receiver.  I had to add capacitance on the end to stop motorboating, 
so I must have improved the audio amplifier.  It has curious design 
choices; the VR tube passes 33 ma, and the bleeder resistor passes 10 
ma, which are pretty heavy for a receiver load of 25-30 ma, so I reduced 
the VR current to 10 ma, and the bleeder to 3 ma.  It also had three 
carbon resistors mounted directly under a fiber board running at their 
full Watt rating, so it's no surprise they were bad and broken.  I am 
not sure about the heater winding, but it looks like this power supply 
will supply two receivers without breaking a sweat.

Richard Brunner, AA1P