[Hammarlund] nuvistaplug mod for sp600?

[peter markavage]

I've used 6CW4's and 6DS4's interchangeably. Performance wise, I've seen
no difference using either tube.

Pete, wa2cwa

On Thu, 29 Dec 2005 13:13:29 -0800 Edward B Richards <zuu6k at juno.com>
writes:
> Hi Eugene;
> 
> Yes. There is a device you can use. Search the catalogs FOR A TEST
> ADAPTER THAT PLUGS INTO THE CHASSIS SOCKET AND HAS ANOTHER SOCKET ON 
> TOP
> WITH CONTACTS TO THE PINS FOR TAKING IN-OPERATION VOLTAGE 
> MEASUREMENTS.
> (damn cap lock) .You would probably discard the upper socket. Hope 
> this
> helps. HNY
> 
> 73, Ed Richards K6UUZ
> Simi Valley, Ca 93065
> Home of the Air Force 1 pavilion
> 
> 
> On Thu, 29 Dec 2005 18:15:45 +0000 "Eugene Hertz" <ehertz at tcaf.org>
> writes:
> > Thanks to everyone who replied about this mod. Looks like 
> > Nuvistaplugs are pretty much unobtainium so it looks like I will 
> > have to build my own, two questions:
> > 
> > 1. I see on ebay that the tested Gm's of 6DS4 nuvistors vary some 
> 
> > between 8000 and 9000. What is the implication of GM to my
> 
> > application? Does a higher GM mean more gain? Does a lower GM mean 
> 
> > more noise? (or vice versa) Does any of this matter?
> > 
> > 2. Since it looks like I might have to build my own, does anyone 
> > know where I might locate a 9-pin base that I could wire the 
> circuit 
> > onto and then plug into the V1 tube socket?  I wonder if there is 
> 
> > some kind of base that one can buy to allow prototyping on top 
> of.
> > 
> > Thanks
> > Eugene