[Boatanchors] 6BE6 VFO/Mixer Tube

[Carl]

Explained quite well in most any RCA tube manual. If you like math then 
Radiotron Designers Handbook 4th Edition is considered the bible.

The 6BE6 is simply a later version of the 6SA7 which is an improved 6K8 
which is an improved 1934 2A7. The self excited oscillator was also used in 
several product detectors of dubious performance.

Carl
KM1H


----- Original Message ----- 
From: "Lee Buller" <k0wa at swbell.net>
To: <boatanchors at mailman.qth.net>
Sent: Thursday, December 03, 2009 4:02 PM
Subject: [Boatanchors] 6BE6 VFO/Mixer Tube




I am trying to figure out how the 6BE6 works with a VFO and a mixer in the 
same tube.

1. Where is the output of the VFO or oscillator?
2. isn't the output of the plate of the 6BE6 the sum or minus of the two 
signals coming in? The one from the previous amplifier and the VFO?
3. Where would you pick off RF or use a counter probe to see what the VFO is 
doing?

It seems the 6BE6 was being used like this in a score of old receivers. I 
get the tube is using feeback through the cathode...but I just don't get the 
output of the VFO? Where is that? For instance...the Drake 2B.

Lee - K0WA


In our day and age it seems that Common Sense is in short supply.  If you 
don't have any Common Sense - get some Common Sense and use it.  If you 
can't find any Common Sense, ask for help from somebody who has some Common 
Sense.  Is Common Sense divine?

Common Sense is the image of the Creator expressing revealed truth in my 
mind. - J. Wolf

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