[HBR] Fw: Fw: Fw: RE: Fw: GB> RE: PULLEN MIXER

Tue, 8 Apr 2003 13:52:06 -0500

I sent this note out in response to some discussions on designing a
modern tube (or hybrid) receiver. Several people have already 
signed onto the HBR reflector as a result. There is still quite a bit 
of interest in good tube receiver performance. 

Keep up the good work Walt. Would it be OK with you to combine 
your HBR2K notes and those from Jim and others into a section on 
the HBR Web Site ?

73  Kees K5BCQ

--------- Forwarded message ----------
From: [email protected]
To: [email protected]
Date: Tue, 8 Apr 2003 09:01:50 -0500
Subject: Fw: RE: Fw: GB> RE: PULLEN MIXER
Message-ID: <[email protected]>

Yes, that one (couldn't find it), "An Experimental Receiver for 75m DX 
Work" by W1KLK in the Feb 1972 issue of QST, and "High Quality Hybrid
Receiver" by VE1ADH in Feb 1968 issue of 73 also have some good ideas.

On a more recent note, Walt Hutchens KJ4KV is developing a HBR2K
receiver (modern tube HBR) and is describing the effort ......pullen
mixers,  numerous improvements, what he tried, what worked and didn't, 
with many additional ideas and input from Jim N2EY. So far Walt has 
written chapters 1-15.  Check them out in the HBR Receiver archives. 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

73  Kees K5BCQ

--------- Forwarded message ----------
From: "W1EOF" <[email protected]>
To: "Prof. Arnaldo Coro Antich" <[email protected]>,
         "_LIST:GlowBugs" <[email protected]>
Date: Sun, 6 Apr 2003 21:44:56 -0400
Subject: RE: Fw: GB> RE: PULLEN MIXER
Message-ID: <[email protected]>

You just reminded me of a time back in the early 70s (???) QST had an
article on the Ultimate receiver, based on tubes. I wish I could find
that
article... I'll search their index to at least locate the year/issue. I
believe it was an 80m receiver intended to be used with a converter. Had
a
LOT of filtering, attention to intercept point, intermod, etc.

Sounded like a great receiver, I always wanted to build it.

73,

Mark W1EOF

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Prof.
> Arnaldo Coro Antich
> Sent: Saturday, April 05, 2003 3:00 PM
> To: [email protected]
> Cc: GLOW
> Subject: Re: Fw: GB> RE: PULLEN MIXER
>
>
> Oh amigo, it seems like we have run the same race a number of times !!!
> The RUSSIAN equivalent is the 6H23P.
> Designing the ideal HF receiver , I will always use an ECC88 or ECC189
> cascode RF amplifier, another one as the PULLEN MIXER, and a 12AT7
crystal
> oscillator and cathode follower... At the input, bandpass tuneable COHN
> filters ( bottom coupled )...
> As a matter of fact, I am just going to stop writing this and start
> collecting the parts for that DESIGNERS DREAM FRONT END... and after
> assembling it I will run tests using it ahead of a receiver that will
tune
> from 2 to 4 megaHertz...
> A 0 to 60 dB attenuator also at the input !!!
> Does anyone has any other ideas to add to the DESIGNERS DREAM
> FRONT END ???
> ( Manual RF gain control ?? )
> ( Bandpass 2 to 4 megaHertz filter as the coupling element for the
PULLEN
> MIXER to provide the output to the variable IF ??? )
> OH YES ! It could be a nice UP CONVERTER TOO, so that the IF will
> tune from
> 30 to 34 mHz or something like that , but the simpler approach is
> better and
> images won't be so bad with the nice RF bandpass filter at the input
!!!
> 73 and DX
> Arnie Coro
> CO2KK
> ----- Original Message -----
> From: "Mike Hanz" <[email protected]>
> To: "Prof. Arnaldo Coro Antich" <[email protected]>
> Cc: "GLOW" <[email protected]>
> Sent: Sunday, April 06, 2003 3:33 PM
> Subject: Re: Fw: GB> RE: PULLEN MIXER
>
>
> > Yes, of course - I neglected to insert the 6ES8 European designation
-
> > ECC189.  My apologies for the oversight.
> >
> > Prof. Arnaldo Coro Antich wrote:
> > > The 6ES8 was originally designed for
> > > a cascode amplifier used in TV tuners ?
> > > There is an excellent European vacuum tube series , ECC88, ECC189
> > > that in my opinion are the best ever made for the cascode
> configuration.
> I
> > > understand they used a peculiar structure for the grid that
> received the
> > > name of ""frame grid"" because the very thin grid wires could then
be
> placed
> > > very close to the other electrodes without fear of a short circuit.
> >
> >
>