[R-390] Off Topic HRO Rebuild

[Tom Frobase]

I was concerned since I used Teflon wire, but it tuned right up.  I was 
looking at the voltage divider for the LO and was thinking I might drop 
a zener diode in the circuit to provide a little better voltage 
regulation, although is stable as it is.  I was careful to mimic 
component placement from the original.

I did not have the original power supply but I did find a Triad in the 
junk box.  Most everything I put back in the radio I had on hand, sans 
the 500K linear control which I ordered for Digikey.

Ben Loper wrote:
> Great work, did you have any issues aligning it since so many parts 
> were changed
>
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> The proper function of man is to live - not to exist.” — Jack London
>
> On Jan 31, 2010, at 19:52, Tom Frobase <tfrobase at gmail.com> wrote:
>
>> I was at the Belton Hamfest about a year ago and bought a couple of
>> really rough HRO receivers.  I donated one of the to the Battle ship
>> Texas and kept the other.  The one I kept was really bad, it made no
>> sense to try and get it running it was just too ugly.
>>
>> Over the holidays I decided to take the time as a "labor of love" and
>> gut the radio and rebuild it.  I was surprised it took over 4 hours to
>> disassemble the radio and clean the solder off of the sockets and
>> terminal strips.  I took approximately 50 digital pictures to aid in the
>> rewiring of the radio. The main capacitor also had to be completely
>> disassembled as well.  The chassis was stripped, sandblasted and
>> repainted.  The IF and BFO cans were disassembled and cleaned.  All
>> existing mica caps were replaced.  I used modern resistors and caps
>> saving lots of space.  I used a medium sized ultrasonic cleaner for most
>> of the cleaning using a solution of sudsy ammonia, it did wonders for
>> the aluminum parts and made the ceramic come out pure white.  It took
>> about 12 hours to rewire the radio Other than a broken internal wire on
>> an IF can, it essentially worked the first time.  I have an output
>> transformer ordered from Fair radio but else than that "IT IS ALIVE!!!"
>>
>> Here is a link to some pictures, they should be speak for themselves
>>      HTTP://www.kitparts.com/HRO       73, tom, N3LLL
>>
>> Yes I know I should using my time for more important things.  Just one
>> more radio off the trash heap ...
>>
>>
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