[Boatanchors] [Glowbugs] One-tube VFO obsession for MOPAs

[bcarling at cfl.rr.com]

Speaking of ONE TUBE VFO

I still have available a complete VFO for the Heathkit DX100 for only $20.00 plus shipping!

Any takers? (If not - why not?)

72 de AF4K
Bry Carling

On 21 Aug 2014 at 0:00, Chris Trask wrote:

> 
> 
> -----Original Message-----
> >From: Brad Thompson <brad.thompson at valley.net>
> >Sent: Aug 21, 2014 1:54 PM
> >To: tetrode at googlegroups.com
> >Subject: [Glowbugs] One-tube VFO obsession for MOPAs
> >
> >Hello--
> >
> >It might be possible to incorporate all of the active devices into one 
> >envelope.
> >
> >General Electric introduced the 6M11 Compactron featuring two triodes 
> >and one pentode in 1962- the tube's innards consisted of two 12AT7 
> >triode sections and one 6EW6 pentode. The tube's EIA base number is 12CA.
> >
> >The audio nuts have discovered the 6M11, though, and one enterprising 
> >web pirate has it FS in the $50.00 range; other vendors offer the tube 
> >well under $10.00, so there's hope.
> >
> >The 6BD11, 14BL11 and 15AF11 all feature two dissimilar dual triodes and 
> >one pentode and are priced at $3.00 at one online site
> >
> 
>      Take a look at the 6BH11.  The triodes are similar to those of the 6M11, and the pentode is just less linear.  Use the pentode for the VFO and the triodes as grounded grid buffers.
> 
> 
> Chris Trask
> N7ZWY / WDX3HLB
> Senior Member IEEE
> http://www.home.earthlink.net/~christrask/
> 
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