[Boatanchors] Valiant keying

[Al Klase]

Charles,

READING THE SCHEMATIC -250 volts on the key seems sensible.  The key 
connects, via SW4A, to the grid (pin 7) of V11.  The grid is returned to 
the -265-volt bias supply via a 47K resistor.

Al

On 12/28/2012 7:32 PM, Rob Atkinson wrote:
> since no one else replied I'll simply say that seems real high.  this
> is for a CW key?  if cathode keyed it could get up there, 90, 120 v.
> but I have never heard of 250.  key contacts would be sparking and
> getting burrs.
>
> I have never owned a Valiant so this is all very general (my comments).
>
> 73
>
> Rob
> K5UJ
>
> On Thu, Dec 27, 2012 at 5:22 PM, Charles Ring <w3nu at roadrunner.com> wrote:
>> Very long-delayed project of reviving the Valiant that I just about wore out
>> as a teen 40 years ago took a big step forward today and yes, the deadly
>> fused power cord is gone, replaced with a 3 wire power cord and a chassis
>> mount fuse holder, plus a second chassis mount fuse holder for the 1.5 amp
>> fuse.
>>
>> I found that the open circuit voltage at the keying jack is close to
>> negative 250 volts. My memory is failing me so is that normal? Closed
>> circuit current is 12 mA.
>>
>> --
>> *Charles Ring W3NU*
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/