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Original Message

Paraphase / Radio-Craft July 1948, p 35

Posted by ChristopherC on January 15, 2002 at 18:45:24:


                            Transformer Primary (10k ohm ct)
                                 |
                                 |
                                 |
                            6V6  |   
                               plate
                               grid2-------+-------+
 input--.02uF----+---50kohm----grid1       |       |
                 |            cathode   .05uF   1.5kohm
                500kohm          |         |       |      Transformer
                 |               |         |       +------Center Tap
                 +---200ohm------+         |       |
                 |               |         |       +----------+
                grd           cathode      |                  |
                               grid1-------+--500Kohm-grd     |
                               grid2--------------------------+ 
                               plate                          |
                            6V6  |                          B+300v
                                 |
                                 |
                            Transformer Primary 
        Fig.10- One 6V6 is a paraphase invertor

from Radio Craft July (John W. Straede),1948, p35,
"...One of the better ccts is shown in Fig.10. Note that the control grid of one 6v6 is coupled to the screen grid of the other through a .05-uf condenser. When a signal is applied to the upper tube, it's screen current varies & develops a voltage across the 1,500-ohm resistor. This voltage has the correct magnitude & polarity to excite the lower tube."

I breadboarded this cct using Reg.PS & Stancor 3830A Univ. OT's, I increased the.02 cap to .47, added a 12au7 tube for the input. Sounds Nice, nice air! Sorta between a SE & PP. I like it better than the 6BQ5 SE, 6CA7 SE, 6DN7 SE w/IT, previously breadboared.

Other similar ccts,
Pop. Elec. Jan 1958, p47,Float-Phase Amp
http://members.tripod.com/~gabevee/pptube.html
http://gabevee.tripod.com/mag1515.html
http://www.triodeel.com/compact.html

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