[HBR] 75khz slug tuned coil question

[Ralph Fowler]

IF transformers generally are designed to work into specific impedances 
and are sometimes designated as "input", "interstage" or "output" 
transformers, depending on where they are placed in the circuit. Using 
then at other than the designed places means they are not terminated 
properly and generally the "Q" will be negatively affected (narrowing or 
widening of the passband). So you should try and find out what type you 
have and use it accordingly.

On 5/25/2012 9:24 AM, William Wood wrote:
> Sounds great to me man : )
> And will do, as to the paying it forward...
> A gent about 2 hours drive from me offered
> a parts radio that had some of these, but I turned
> it down, as it was a trade, I would rebuild a similar
> one for him.  While I have 'fixed' a couple of tube
> receivers in the past, I am not sure of my knowledge
> base enough to tackle someone else's receiver : )
> It has been tempting to try to do it, but if I mess things
> up I might have my hands full, especially if the parts
> are not easily obtained.
> Thanks again
> 73
> Bill
>
>
>
> On May 25, 2012, at 7:14 AM, Bill Cromwell wrote:
>
>> On Thu, 2012-05-24 at 21:14 -0400, ke9xq at charter.net wrote:
>>> I was thinking I heard these will work if you select a frequency
>>> such as 75, or 85 or 100, you have to reconsider the specifics, but
>>> should work...
>>> 73
>>> Bill
>>>
>>
>>
>> Hi Bill,
>>
>> I got confused when you referred to the cans I have as 75 kc cans. I
>> thought you had some "other cans" coming and I would have saved these
>> back for somebody else. I DO NOT need them. I'm sure they'll retune down
>> that far (10 kc) or up to 100 kc (15kc) if that's where you want to go.
>> I am using the ones in my project at the design frequency of 85 kc. The
>> BFO coil is the only part you will have to find. That coil is the only
>> part I can't spare. I stopped looking when I acquired all the parts I
>> need.
>>
>> The cans are yours. I'll get them on their way...probably right after
>> the holiday. NO! Not the Christmas holiday <evil grin>. I was hunting
>> for sets of those and ended up going from famine to feast. I don't
>> remember what I paid for them Bill - maybe $20 or so (not a lot you can
>> be sure). Send something to somebody else when needed if you see a
>> request on one of these reflectors. That's called "paying it forward".
>> It's how I live.
>>
>> 73,
>>
>> Bill  KU8H
>>
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