[GreenKeys] Model 28 Drive Voltage

[Bob Camp]

Hi

Each of the 28's I have sitting here have a cute little box in them. 
The box has a high voltage supply and a vacuum tube to switch the 
magnets. I had more or less assumed that it was a standard part of a 28 
....

	Enjoy!

		Bob Camp
		KB8TQ


On May 23, 2004, at 10:36 PM, Gerry Block wrote:

> Keyer tube?  It has been so long I don't even remember a keyer tube.  I
> could swear my machines ran off a loop.  I also 'remembered' that the 
> net
> was on 3620Khz...
>
> Gerry
> AD6MC
>
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net]On Behalf Of Bob Camp
> Sent: Sunday, May 23, 2004 6:55 PM
> To: GreenKeys List
> Subject: [GreenKeys] Model 28 Drive Voltage
>
>
> Hi,
>
> Back in the good old days of running 15's about the only option in
> driving them was the choice between series or parallel connecting the
> magnets. Both ways you pretty much needed a high voltage loop supply.
> On a 28 things seem to be a bit different. The magic little vacuum tube
> keyer drives the magnets so as far as I can see there is no real need
> for a 60 ma / high voltage loop.
>
> Assuming I haven't missed something so far here's the question: How low
> a voltage can you reliably drive the keyer tube with?
>
> Of course if the first part is off then the question makes no sense at
> all ....
>
> 	Enjoy!
>
> 		Bob Camp
> 		KB8TQ
>
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