[Heathkit] Re: Re: 6293 tube question

[Kim Herron]

Hi Guys!!
	If you do some research in a transmitting tube manual, you'll find
that the difference is the grid structure in the tube.  The grids are MUCH
heavier and they are rated at heavier current.  You also have to realize
that the power ratings are for PULSE service, which has do to with the radar
system that they were designed for.  In steady output service, which ham use
is, that tube will put out about 30 to 40 percent more power (So I've been
told).  The thing that makes this a nice tube for ham use is that the grid
structure is much harder to burn out due to mistuning or taking a long time
to tune up (read novice operator here).  I can guarantee that you won't get
500 watts out of a tube.  The envelope won't last that long.

Kim Herron W8ZV 
kim.herron at sbcglobal.net
1-616-677-3706

-----Original Message-----
From: heathkit-bounces at mailman.qth.net
[mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Ken Kaplan
Sent: Sunday, October 26, 2008 1:25 PM
To: Harold Hairston; heathkit at mailman.qth.net
Subject: [Heathkit] Re: Re: 6293 tube question


Harold,

Hang on to your 6146. I bet we'll have a problem finding a 6293 for autopsy.
Seriously - if I 
can get 2 specimens, I'll tear'em down, take measurements & pictures and
post the results 
on a website.

Ken

> Looks like there is a simple solution available. Obtain a 
> weak/defective
> specimen of each tube. Wrap them separately in a cloth and and take a
hammer 
> to them or cut them open if you have the tools. I will supply the 6146.
>
> Harold
>
> ----- Original Message -----
> From: "Ken Kaplan" <krkaplan at cox.net>
> To: <heathkit at mailman.qth.net>
> Sent: Saturday, October 25, 2008 4:00 Hank
> Subject: [Heathkit] Re: 6293 tube question
>
>
> > Ok - I don't doubt that Glen is right about the 6293 being a 
> > "tougher"
> > 6146. What I haven't
> > been able to figure out is how they (the manufacturers) did it. I
examined 
> > a 6293 and a 6146
> > under a 10x-30x stereo microscope and I'd swear on a stack of good
matched 
> > pair gold pin
> > cryogenic treated shot peened magnafluxed 6L6's that they are the same 
> > inside (at least
> > what you can see through the glass). The plate metal and other visible 
> > parts are the same
> > thickness and the spot welds look the same. Must be something different 
> > deeper inside.
> > Guess I'll have to wait until they go bad to find out.
> >
> > Anyone who uses 6146 family tubes (bet there are at least a dozen of 
> > you)
> > should read
> > Glen's article on the tube.
> >
> > fyi - tubes are not pretty at 10x and worse at 30x.
> >
> > btw - I was just kidding about the 6L6's (especially the shot peened
> > part).
> >
> > 73 Ken kb7rgg
> >
> > 
>