[GreenKeys] Model 19 Power Supplies

[Joe Clanin]

Thanks everyone for the responses.

I've got a REC-30 thyratron supply, a REC-13 Selenium supply, a REC-11
selenium supply and an RA-87 loop supply. The REC-30 is in need of one
replacement 323B thyratron tube and an NE-42 neon bulb due to improper
storage by the previous owner, and I'm on the lookout for reasonably priced
replacements.

I've got two Model 19 sets, and it sounds like I will have luck replacing
the selenium rectifiers with silicon and powering my loops separately from
anything involving the the punches.

Best,

Joe

On Mon, Jan 13, 2020 at 11:16 PM Paul Heller <paul0926 at comcast.net> wrote:

> Well perhaps I’ve lived too dangerously and it is time to change. I have
> two model 19s, one is Bell and one is Navy. I’ve never powered on the Navy
> unit, but have occasionally used the Bell unit.  Now you guys have me
> worried.
>
> Paul
> W2TTY
>
> On Jan 13, 2020, at 9:29 PM, Bruce Gentry via GreenKeys <
> greenkeys at mailman.qth.net> wrote:
>
> A resistor to imitate the forward drop of a selenium rectifier will work
> well only with a fairly constant load. The punch magnets in a 19
> intermittently draw a good bit of current,� adjusting transformer taps
> (if there are any) or adding a bucking transformer to the circuit to reduce
> the voltage going into the rectifier� would be� far better. Be sure to
> use silicon diodes with at least a 1000 volt rating, the transient voltages
> in the punch magnet circuit can be quite high even with the snubber
> circuit. One great advantage of selenium rectifiers is their tolerence for
> transients and momentary overloads. They will endure a lot of abuse and
> survive.
>
> ���� Bruce Gentry, KA2IVY
>
> On 1/13/20 10:48 PM, w9ddd at tapr.org wrote:
>
> A long discussion about replacing selenium with silicon diodes here:
> https://antiqueradios.com/forums/viewtopic.php?t=305477
>
> My take away is you can approximate by putting a 100-200 ohm resistor in
> series with the silicon.
>
> John, W9DDD
>
>
> On Jan 13, 2020, at 4:46 PM, E. <hanyou at xsmail.com> wrote:
>
>
> That�s one of the reasons why I have two power supplies on mine� one
> for the loop and the second for the DC punch side ;) . �Overkill, but
> better safe than sorry :) ~
>
>
> On Jan 13, 2020, at 4:39 pm, Jim Cooper <jim.w2jc at gmail.com> wrote:
>
>
> On 13 Jan 2020 at 15:44, Jim Haynes wrote:
>
>
> If you're using that rectifier for
>
> loop power as well as for running the
>
> punch you'd need to adjust the loop
>
> current because of the higher voltage.
>
>
> Keep in mind, also, that the reason for the
>
> regulation in the case of the Model 19 is
>
> that the punch solenoid takes a LOT of current
>
> in sharp, irregular bursts ... which could do lots
>
> of mess with the loop current if not regulated.
>
>
>
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