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

[Paul Dulaff]

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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