[Hallicrafters] SX62 Audio transformer

[Julian Bunn]

Hi Roy,

Thanks for the input: comments below

roy.morgan at nist.gov wrote:

>Quoting Julian Bunn <Julian.Bunn at caltech.edu>:
>
>  
>
>>The audio transformer in an SX62 I am refurbishing has an open-circuit 
>>primary winding.
>>    
>>
>
>Julian,
>
>Thie *may* have happened because of too-high audio output tube plate current -
>in turn caused by leaky grik blocking caps.  Replace those caps for SURE.
>  
>

I've re-capped the whole unit's paper/wax capacitors, and a few 
electrolytics.

>
> than finding an original, what options do I have? Are these things 
>  
>
>>easily > repaired?! How would I select a modern replacement?
>>    
>>
>
>Options:
> 1) Get it rewound.  Gary Brown does it.
>  
>

I'm in touch with Gary ... this is quite a time consuming task, and 
consequently not exactly
cheap :-)

>2) Find a suitable replacement from old parts.
>  
>
I have quite a few old transformers, but only a couple of audio output 
units.

>3) Buy a new one that has more or less the right plate impedance.  Look up in
>tube data sheets for the impedance you need.
>  
>
Good plan: I will take a look. The RadioShack 70V line matching 
transformer has been suggested.

>The truth is, most any transformer of the right sort will do fine.  (The radio
>is push pull 6V6's is it?)  The manual might say. SAMS Photofact will list at
>least one replacement unit, maybe more - look up those numbers in catalogs.
>  
>

Yes, 6V6s. Apparently the sound quality is excellent, so I want to 
replace the transformer with something
decent, to avoid losing the fidelity.

>Roy
> 
>
>Roy Morgan
>7130 Panorama Dr.
>Derwood MD 20855
>
>  
>

Many thanks for your input.

Julian