[Heathkit] Re: 6293 tube question

[Harold Hairston]

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
>
>