[HBR] 85 KHz IFs

[B. Smith]

Those coils work very well as is. See for info including mounting and 
alternate mounting schemes.
http://k4che.com/HBR/IF%20Coil%20Pages%20and%20Photos/IF%20Coil%20Selection.htm

breck k4che

On 11/20/2014 10:08 AM, Peter Bertini wrote:
> Those IF cans had a very, very narrow tuning range, the trimmer caps were
> too small value to have much authority over the IF frequency. You may want
> to add some external fixed padders or trimmers to get them exactly on
> frequency.  The neat feature of those cans is that you can remove that
> little black cover, and adjust the coupling between the coils to set the
> bandwidth.
>
> Some guys have salvaged the mica sockets and male connectors from the old
> BC-xxx chassis in order to use the existing mounting system.  You can
> directly solder to the female terminals on the base of the transformers,
> however.
>
> Pete
>
> On Thu, Nov 20, 2014 at 8:03 AM, Shoppa, Tim <tshoppa at wmata.com> wrote:
>
>> That tube lineup you mention sure sounds like a BC-453.
>>
>> Tim N3QE
>>
>> Sent from my Windows Phone
>> ________________________________
>> From: William Wood<mailto:ke9xq at charter.net>
>> Sent: 11/19/2014 10:11 PM
>> To: hbr at mailman.qth.net<mailto:hbr at mailman.qth.net>
>> Subject: [HBR] 85 KHz IFs
>>
>> Greetings Folks
>>     Traveled a short distance today to pick up my new
>> 85 KHz Ifs, and a 65 KHz IF if that thing is labeled right.
>> 2 x 85 and 1 x 65  I wonder what the range will be on each?
>> 36 miles away, 72 round trip, but the roads were in good
>> winter driving conditions.  And well worth the little side trip : )
>> Can't remember what the gent said that they came out of, I
>> think it was a BC 453???   Do not remember the facts, just
>> know I'm getting closer to the parts listed that is needed.
>>
>>     Have a few shorter cans too, do not know what they are
>> as of yet, but they came out of the same receiver.
>>
>>     Did you guys modify the base, these are female holes
>> that sit down over pins.  Can't remember how they were
>> put into action, I guess I need to find that printout : )
>>
>>     Now I have to find that schematic again and see
>> what I needed.  Had a thought today, I have a bunch of
>> Octals, and was thinking of going the octal route, but I
>> think I shot that down right away for two reasons.  One is my
>> lack of technical skills to do all the sub work, and the second is
>> probably the newer miniature tubes would have better all
>> around performance.
>>
>>     Now that I argued myself out of that idea folks, any ideas
>> pro or con on the subject???   I like the "older" idea, but
>> newer idea is better performance...
>>
>>     Kees or someone, I know I printed out the book materials
>> and have it around here 'somewhere' I still would like to get
>> a copy of the CD again, Happy to pay the ten spot.  I think
>> I wrote to the other gent that archived the history and offered
>> to buy his disk too, but still have not heard from him.
>>
>>     Think I will go to the archiving sites tonight, and se if I can
>> at least download the schematic for the HBR 13C so I can
>> ruminate a bit more on the subject : )
>>
>> 73 Everyone
>> Bill  KE9XQ
>>
>> PS  Keep digging, those parts are out there, some of which
>> might take a couple of years to find, but they are there,
>> I have faith in our hunting abilities : )
>>
>> PSS the tubes that came in the little box were:
>> 12A6 GT, 12SK7 GT, 12SK7 GT, VT131 (ANOTHER 12SK7)
>> 12SR7, AND A 12K8.  If that gives anyone a hint as to where
>> the parts came from.  Cheers
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