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In article <1002@me.ri.cmu.edu>, berman@me.ri.cmu.edu (Steven Berman) writes:
> Since there seems to so many people out there that know about magic
> eye tubes, Does anyone out there know what equivalent number
> matches 1629?  I have what looks like a 6E5, based on the picture
> on page 53 of the RCA receiving tube manual (yes, I really own one!!).
> But my tube stubbornly calls itself 1629.  I really want to build 
> a project with this tube, but I need the pin-out and specs before I can
> build it.

	As far as I know, the 1629 is electrically identical to the 6E5,
but is an industrial/military equivalent in an octal base (the 6E5 is a
6-pin base).  While I don't have the exact electrical specs for the 1629
handy, I do have the pin-out data from a tube tester reference manual
(don't laugh - we still have a tube tester buried in a storeroom!):

	Plate = pin 2
	Grid = pin 5
	Cathode = pin 8
	Target anode = pin 4
	Filament = pins 2 and 7
	Pin 1 has no connection, and pin 6 is physically missing

> Any suggestions are greatly appreciated (especially about
> possible low-cost power supplies).

	I would use a transformer with a secondary of 175-0-175 volts
@ 0.025 mA and 6.3 volts @ 0.5 A.  Use a couple of 1N4007 or equivalent
diodes and a pi-type filter using a resistor as the series element.
This should be good enough without any regulation, although if you want
to be a purist about it, there are many inexpensive TO-220 power
transistors with a Vceo of 300 volts to use for a series regulator.
If you are going to regulate, go for 200 to 220 volts.

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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