From windy10605 at juno.com  Tue Oct  2 12:29:18 2007
From: windy10605 at juno.com (Kees & Sandy)
Date: Tue Oct  2 12:35:05 2007
Subject: [HBR] Fw: [ForSale-Swap] Millen IF Transformers FS
Message-ID: <20071002.112918.5215.5@webmail04.dca.untd.com>



---------- Forwarded Message ----------
Hello-
   Have for sale some NOS IF transformers as follows :
       James Millen 50 KC pairs, #64051 input / interstage and #64052 
output. These are very                             similiar physically to 
the JW Miller 50 KC units. They have the 2 side adjusted tuning 
adjustments and are in similiar, but smaller, square cans than Miller.They 
are permeability tuned with         fixed capacitors. Very nice units. 
30.00 per pair, abt. 12 pairs available.

       James Millen 50 KC Tuned Circuit #63650. This is in a square can 
with a top capacitor adjustment.         Very nice silver plated air 
trimmer. Iron core coil.      15.00 each, abt. 15 available.

       James Millen 455 KC pairs, #64455 input / interstage, #64453 diode 
output. These are very similiar         physically to Miller 912-series with 
the side adjustment. Permeability tuned with fixed capacitors. 
25.00 per pair, abt. 7 pairs available.

I am looking for others with James Millen IF transformers that may have some 
#'s that I need to complete a set, etc. I have other Millen IF's here for 
trade, etc. Here are some #'s that I have a few extra of:
           #62454 -- 455  KC output diode, iron core, top capacity adjust.
           #62162 -- 1600 KC output diode, iron core, top capacity adj.
           #64161 -- 1600 KC input or interstage, permeability tuned, 
similiar to Miller 912-series with side 
adjustments.
                                       Thanks, Byron WA5THJ. 
______________________________________________________________
ForSale-Swap mailing list
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Help: http://mailman.qth.net/subscribers.htm
Post: mailto:ForSale-Swap@mailman.qth.net
From n7gtb at yahoo.com  Tue Oct  2 13:25:54 2007
From: n7gtb at yahoo.com (Vern VanZ)
Date: Tue Oct  2 13:30:21 2007
Subject: [HBR] Fw: [ForSale-Swap] Millen IF Transformers FS
Message-ID: <941954.28043.qm@web63309.mail.re1.yahoo.com>

I'm interested in a set of the 50khz IF trannies...

How do I contact Byron?

Thanks,
-Vern

----- Original Message ----
From: Kees & Sandy <windy10605@juno.com>
To: hbr@mailman.qth.net
Sent: Tuesday, October 2, 2007 9:29:18 AM
Subject: [HBR] Fw: [ForSale-Swap] Millen IF Transformers FS



---------- Forwarded Message ----------
Hello-
   Have for sale some NOS IF transformers as follows :
       James Millen 50 KC pairs, #64051 input / interstage and #64052 
output. These are very                             similiar physically to 
the JW Miller 50 KC units. They have the 2 side adjusted tuning 
adjustments and are in similiar, but smaller, square cans than Miller.They 
are permeability tuned with         fixed capacitors. Very nice units. 
30.00 per pair, abt. 12 pairs available.

       James Millen 50 KC Tuned Circuit #63650. This is in a square can 
with a top capacitor adjustment.         Very nice silver plated air 
trimmer. Iron core coil.      15.00 each, abt. 15 available.

       James Millen 455 KC pairs, #64455 input / interstage, #64453 diode 
output. These are very similiar         physically to Miller 912-series with 
the side adjustment. Permeability tuned with fixed capacitors. 
25.00 per pair, abt. 7 pairs available.

I am looking for others with James Millen IF transformers that may have some 
#'s that I need to complete a set, etc. I have other Millen IF's here for 
trade, etc. Here are some #'s that I have a few extra of:
           #62454 -- 455  KC output diode, iron core, top capacity adjust.
           #62162 -- 1600 KC output diode, iron core, top capacity adj.
           #64161 -- 1600 KC input or interstage, permeability tuned, 
similiar to Miller 912-series with side 
adjustments.
                                       Thanks, Byron WA5THJ. 
______________________________________________________________
ForSale-Swap mailing list
FAQ: http://mailman.qth.net/swap/swap.htm
Home: http://mailman.qth.net/mailman/listinfo/forsale-swap
Help: http://mailman.qth.net/subscribers.htm
Post: mailto:ForSale-Swap@mailman.qth.net
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and
construction notes...... via http://www.qsl.net/k5bcq/
there is also a mirror (faster response)at http://k5bcq.edebris.com/


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






      ____________________________________________________________________________________
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From n7gtb at yahoo.com  Tue Oct  2 13:52:38 2007
From: n7gtb at yahoo.com (Vern VanZ)
Date: Tue Oct  2 13:57:09 2007
Subject: [HBR] Fw: [ForSale-Swap] Millen IF Transformers FS
Message-ID: <600361.73796.qm@web63303.mail.re1.yahoo.com>

Sorry to fill up everyone's inbox...I found an email address for Byron at qrz.com.

-Vern

----- Original Message ----
From: Kees & Sandy <windy10605@juno.com>
To: hbr@mailman.qth.net
Sent: Tuesday, October 2, 2007 9:29:18 AM
Subject: [HBR] Fw: [ForSale-Swap] Millen IF Transformers FS



---------- Forwarded Message ----------
Hello-
   Have for sale some NOS IF transformers as follows :
       James Millen 50 KC pairs, #64051 input / interstage and #64052 
output. These are very                             similiar physically to 
the JW Miller 50 KC units. They have the 2 side adjusted tuning 
adjustments and are in similiar, but smaller, square cans than Miller.They 
are permeability tuned with         fixed capacitors. Very nice units. 
30.00 per pair, abt. 12 pairs available.

       James Millen 50 KC Tuned Circuit #63650. This is in a square can 
with a top capacitor adjustment.         Very nice silver plated air 
trimmer. Iron core coil.      15.00 each, abt. 15 available.

       James Millen 455 KC pairs, #64455 input / interstage, #64453 diode 
output. These are very similiar         physically to Miller 912-series with 
the side adjustment. Permeability tuned with fixed capacitors. 
25.00 per pair, abt. 7 pairs available.

I am looking for others with James Millen IF transformers that may have some 
#'s that I need to complete a set, etc. I have other Millen IF's here for 
trade, etc. Here are some #'s that I have a few extra of:
           #62454 -- 455  KC output diode, iron core, top capacity adjust.
           #62162 -- 1600 KC output diode, iron core, top capacity adj.
           #64161 -- 1600 KC input or interstage, permeability tuned, 
similiar to Miller 912-series with side 
adjustments.
                                       Thanks, Byron WA5THJ. 
______________________________________________________________
ForSale-Swap mailing list
FAQ: http://mailman.qth.net/swap/swap.htm
Home: http://mailman.qth.net/mailman/listinfo/forsale-swap
Help: http://mailman.qth.net/subscribers.htm
Post: mailto:ForSale-Swap@mailman.qth.net
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and
construction notes...... via http://www.qsl.net/k5bcq/
there is also a mirror (faster response)at http://k5bcq.edebris.com/


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






      ____________________________________________________________________________________
Luggage? GPS? Comic books? 
Check out fitting gifts for grads at Yahoo! Search
http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz
From bjtatum1 at peoplepc.com  Thu Oct  4 20:57:49 2007
From: bjtatum1 at peoplepc.com (Byron Tatum)
Date: Thu Oct  4 21:02:29 2007
Subject: [HBR] IF Transformer Theory Questions
Message-ID: <00b201c806ea$c1806430$9645e604@your6jnhhu0520>

Hello-
    If I could bother anyone with the knowledge and experience in working with tube circuit IF transformers I would like some help in these areas: (455 KC units)
    1. The subject of reversing the leads of one coil, and said coil is wound in opposite direction of other coil. I noticed this done on an IF transformer, in comparing it with a very similiar one using the same coils, same spacing, perm tuned, and same fixed capacitors. The former transformer was rated at 9 KC selectivity at 6 dB down (diode transf.), the latter was rated at 12 KC selectivity at 6 dB down (input / interstage transf.).
        What occurs if you simply build an IF transformer with coils wound in opposite directions, is the coupling greatly reduced? Is this why they also swapped the leads around on the coil wound in opposite direction, to only slightly reduce the coupling and gain an improvement in selectivity?
    2. I am having trouble finding any technical information on the differences in IF transformers as far as input, interstage or output. Typically the coil on "input" side {plate conn.) of IF transformer has less inductance than coil on "output" side (grid conn.) of said transformer. I have noticed on most transformers the plate circuit coil will close to one-half the inductance of grid circuit coil. This seems to be the case for input, interstage or diode load transformers. I believe the reason for the difference in coils is impedance matching? I had the understanding that most diode load transformers had closer spacing with the goal to be more coupling, with selectivity not a priority. Then, I come across a diode load transformer that has greater selectivity than the matching interstage transformer.So, I wonder " Can I use this diode load transformer as an input or interstage transformer?" What different impedance does the transformer see when operating into a diode load as compared to an IF amplifier grid? 
From Hopperdhh at aol.com  Fri Oct  5 08:17:43 2007
From: Hopperdhh at aol.com (Hopperdhh@aol.com)
Date: Fri Oct  5 08:32:14 2007
Subject: [HBR] IF Transformer Theory Questions
Message-ID: <d24.174f26fc.34378567@aol.com>

BJ,
 
Very good questions!
 
I'll take a crack at your first question.
 
The difference in selectivity is due to whether the capacitive coupling aids 
or opposes the inductive coupling.  In tube type high impedance circuits, even 
1/4 to 1/2 pF of capacitance between the two coils can make a big difference 
in the response of the transformer.
 
A good reference and a very complete answer to your question can be found in 
the Meissner "How to Build" Instruction Manual (copyright 1943) reprinted by 
Lindsay Publications Inc, Manteno, IL.
 
For the second part of question 1: For economic reasons both coils are 
usually wound at the same time, therefore in the same direction.  The coupling 
coefficient would be the same if they were wound in the opposite directions.
 
73,
 
Dan Hopper K9WEK
 
 
 
In a message dated 10/4/2007 8:58:08 PM Eastern Standard Time, 
bjtatum1@peoplepc.com writes:
Hello-
If I could bother anyone with the knowledge and experience in working with 
tube circuit IF transformers I would like some help in these areas: (455 KC 
units)
1. The subject of reversing the leads of one coil, and said coil is wound in 
opposite direction of other coil. I noticed this done on an IF transformer, in 
comparing it with a very similiar one using the same coils, same spacing, 
perm tuned, and same fixed capacitors. The former transformer was rated at 9 KC 
selectivity at 6 dB down (diode transf.), the latter was rated at 12 KC 
selectivity at 6 dB down (input / interstage transf.).
What occurs if you simply build an IF transformer with coils wound in 
opposite directions, is the coupling greatly reduced? Is this why they also swapped 
the leads around on the coil wound in opposite direction, to only slightly 
reduce the coupling and gain an improvement in selectivity?




************************************** See what's new at http://www.aol.com
From daileyservices at qwest.net  Fri Oct  5 17:19:16 2007
From: daileyservices at qwest.net (Thomas C. Dailey - Dailey Services, LLC)
Date: Fri Oct  5 17:28:10 2007
Subject: [HBR] IF Xfmrs
References: <00b201c806ea$c1806430$9645e604@your6jnhhu0520>
Message-ID: <004101c80795$6343d310$6702a8c0@tomb2bf38c9b6e>

Back some time ago, I mentioned that I had several pair of 455 kc IF xfmrs 
on individual chassis.  These were used in an electronics course, and I 
think they used a 6BA6 in the socket of the "module".  Each module has an 
INPUT and OUTPUT can (2), and are the screwdriver trimmer adjustment type, 
the 7-pin socket is in the middle.  Anybody who wants one (or more) of these 
can get 'em for $15 per module, plus whatever shipping might come to (I'd 
send 'em parcel post, as there's nothing to break...and it's cheaper).  My 
apologies to anybody who wanted 'em before - family stuff got in the way of 
mailings.

Tom D.
W?EAJ
Denver 

From bjtatum1 at peoplepc.com  Sat Oct  6 21:54:39 2007
From: bjtatum1 at peoplepc.com (Byron Tatum)
Date: Sat Oct  6 21:59:34 2007
Subject: [HBR] IF Transformer Theory Questions
References: <d24.174f26fc.34378567@aol.com>
Message-ID: <002201c80885$0a7a7810$7645e604@your6jnhhu0520>

Thanks Dan. I have obtained the Meissner book, thanks a lot! Byron.
----- Original Message ----- 
From: <Hopperdhh@aol.com>
To: <hbr@mailman.qth.net>
Sent: Friday, October 05, 2007 7:17 AM
Subject: Re: [HBR] IF Transformer Theory Questions


> BJ,
>
> Very good questions!
>
> I'll take a crack at your first question.
>
> The difference in selectivity is due to whether the capacitive coupling 
> aids
> or opposes the inductive coupling.  In tube type high impedance circuits, 
> even
> 1/4 to 1/2 pF of capacitance between the two coils can make a big 
> difference
> in the response of the transformer.
>
> A good reference and a very complete answer to your question can be found 
> in
> the Meissner "How to Build" Instruction Manual (copyright 1943) reprinted 
> by
> Lindsay Publications Inc, Manteno, IL.
>
> For the second part of question 1: For economic reasons both coils are
> usually wound at the same time, therefore in the same direction.  The 
> coupling
> coefficient would be the same if they were wound in the opposite 
> directions.
>
> 73,
>
> Dan Hopper K9WEK
>
>
>
> In a message dated 10/4/2007 8:58:08 PM Eastern Standard Time,
> bjtatum1@peoplepc.com writes:
> Hello-
> If I could bother anyone with the knowledge and experience in working with
> tube circuit IF transformers I would like some help in these areas: (455 
> KC
> units)
> 1. The subject of reversing the leads of one coil, and said coil is wound 
> in
> opposite direction of other coil. I noticed this done on an IF 
> transformer, in
> comparing it with a very similiar one using the same coils, same spacing,
> perm tuned, and same fixed capacitors. The former transformer was rated at 
> 9 KC
> selectivity at 6 dB down (diode transf.), the latter was rated at 12 KC
> selectivity at 6 dB down (input / interstage transf.).
> What occurs if you simply build an IF transformer with coils wound in
> opposite directions, is the coupling greatly reduced? Is this why they 
> also swapped
> the leads around on the coil wound in opposite direction, to only slightly
> reduce the coupling and gain an improvement in selectivity?
>
>
>
>
> ************************************** See what's new at 
> http://www.aol.com
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
> there is also a mirror (faster response)at http://k5bcq.edebris.com/
>
>
> Retrieve reflector archived data via 
> http://mailman.qth.net/mailman/listinfo/hbr
>
> 

From kbgluxford at fastmail.fm  Tue Oct 16 04:37:52 2007
From: kbgluxford at fastmail.fm (KBG Luxford)
Date: Tue Oct 16 04:45:16 2007
Subject: [HBR] IF Transformer Theory Questions
In-Reply-To: <002201c80885$0a7a7810$7645e604@your6jnhhu0520>
References: <d24.174f26fc.34378567@aol.com>
	<002201c80885$0a7a7810$7645e604@your6jnhhu0520>
Message-ID: <47147860.3050609@fastmail.fm>

For those of you who would like to download the section of the Meissner 
manual which deals with IF transformer theory, just click on the 
following URL: http://tinyurl.com/2oyylw

This URL points to a .pdf file of pages 9 to 19 inclusive of the 
Meissner manual from which I have removed the yellow colour that the 
originally scanned pages had acquired with age.  The printing, however, 
has a brown hue, but it is reasonably easy to read (with glasses!)

I am not sure, now, from which website that I downloaded the full copy 
of this manual.

73
Kevin

From wrcromwell at gmail.com  Wed Oct 17 08:58:16 2007
From: wrcromwell at gmail.com (Bill Cromwell)
Date: Wed Oct 17 09:04:16 2007
Subject: [HBR] Re: IF Transformer Theory Questions (KBG Luxford)
Message-ID: <234313270710170558i4eeab1c2ndcd7877cb1805592@mail.gmail.com>

Kevin,

Thanks for the link to the Meisner pages. I got it...skimmed over it.
I'll clean my bifocals and read it more closely.

73,

Bill KU8H
From ianmwilson73 at gmail.com  Wed Oct 17 11:08:34 2007
From: ianmwilson73 at gmail.com (Ian Wilson)
Date: Wed Oct 17 11:14:42 2007
Subject: [HBR] IF Transformer Theory Questions
In-Reply-To: <47147860.3050609@fastmail.fm>
References: <d24.174f26fc.34378567@aol.com>
	<002201c80885$0a7a7810$7645e604@your6jnhhu0520>
	<47147860.3050609@fastmail.fm>
Message-ID: <7de2d65c0710170808m30185040y657a125c4df58210@mail.gmail.com>

Very nice, thanks Kevin.

My guess is that the original is the scan made by Lloyd, KK7IZ:
http://lloydsdipsydumpster.com/archives/archives_index.htm

(the Meissner manual and lots of other interesting stuff).

73, ian K3IMW
From kbgluxford at fastmail.fm  Sat Oct 20 20:46:33 2007
From: kbgluxford at fastmail.fm (KBG Luxford)
Date: Sat Oct 20 20:54:41 2007
Subject: [HBR] IF Transformer Theory Questions - URGENT
Message-ID: <471AA169.1090704@fastmail.fm>

Guys,

The number of downloads has far exceeded expectations to the point where 
my generous bandwidth limits have been exceeded and my file storage has 
been / soon will be suspended by my provider.  I am sorry, but I must 
now remove the Meissner file from the website.

Apologies for the inconvenience.

Someone who has downloaded it may like to put it up on a website where 
there are fewer bandwidth restrictions.

73
Kevin
VK3DAP / ZL2DAP
