[HBR] Fwd: Re: dual triode mixer - Pullen Mixer Notes

[Hopperdhh at aol.com]

Great articles, Paul.  Thanks a lot.
 
Dan K9WEK
 
 
 
 
In a message dated 11/19/2011 8:25:30 P.M. Eastern Standard Time,  
pdulaff at embarqmail.com writes:

Here is  the link:

http://aafradio.org/docs/Pullen.htm

Paul -  WB2NMI

----- Forwarded Message -----
From: Paul Dulaff  <pdulaff at embarqmail.com>
To: HBR Receiver List  <hbr at mailman.qth.net>
Sent: Sat, 19 Nov 2011 20:24:02 -0500  (EST)
Subject: Re: [HBR] dual triode mixer - Pullen Mixer  Notes

Donald

I have attached a link to information on the Pullen  Mixer. This is a dual 
triode configuration. The link contains information on  theory of operation, 
correct design and biasing. Information is also listed  for the reworked 
1st mixer for the 75A-4 using this approach. I understand  this implimentation 
works very well.

Paul - WB2NMI


-----  Original Message -----
From: donald haworth  <donmhaworth at gmail.com>
To: HBR Receiver List  <hbr at mailman.qth.net>
Sent: Sat, 19 Nov 2011 14:46:11 -0500  (EST)
Subject: Re: [HBR] dual triode mixer

Walt.
Can you tell me  where I can find more info about the dual triode mixer?  I
am planning  to use a 6gm8....Can you tell me what led you to using the dual
triode,  rather than, say, a pentagrid type?
-Sorry for all the dumb  questions....but it just seems 'to good to be
true'.  I really would  like to know how the thing works.....I was also
thinking of using two  6gk5's-a very high gm tube-
-Your thoughts, please...
Thanks Don  (wb0rai) in Nashville

On Mon, Nov 14, 2011 at 8:18 PM, Walt Hutchens  <waltah at earthlink.net> 
wrote:

> Donald:
>
> >  As I understand it-both cathodes go to ground via a 470 ohm
> >  resistor, and the plates are tied together and go to B+ via the tank  
ckt.
> > Unlike the Pullen which has different plate voltage on the  two plates.
>  Is
> > that correct?
>
> That's  it.  Couldn't be much simpler!
>
> Walt
>  KJ4KV
>
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