[Hallicrafters] S-53A

[Edward B Richards]

Bob;

I don't know what kind of IF transformers you have so I cannot comment on
that, The next two are related. First the speaker uses AC not DC. and I
don't see how you can run at full volume and be only 50 mw. I see this in
alignment procedures and ignore it. The important thing is to keep the
volume at a comfortable level without overloading the receiver or running
into noise. It will not affect the alignment. Run around a volt or so of
AC across the speaker. Reduce the generator output as the volume
increases so as not to overload the receiver. You can also use the RF
gain control for this. Practice a while and you will get the hang of it. 
Good luck.

73 from Ed Richards K6UUZ
Simi Valley, CA. Home of Air 
Force 1 pavilion

On Mon, 18 Jun 2007 12:28:47 -0700 "Harrison, Bob M"
<Bob.Harrison at unisys.com> writes:
> In attempting to align the S-53A I had started 2 years ago and then 
> set
> aside until yesterday I found that two of the IF transformer 
> adjustment
> point slots are so worn that it is impossible to get an alignment 
> tool
> or any other type of tool to engage and turn it.  Beyond replacement 
> of
> the entire IF transformer unit is there a way to fix or repair it 
> so
> that it can be adjusted?  I am sure that this must be a fairly 
> common
> occurrence in many radios of this era.
> 
>  
> 
> A second dumb question, the alignment procedure says to adjust the
> signal generator so that a reading of 50 mw is detected at the 
> voice
> coil of the speaker.  Would this be the same as detecting the dc 
> voltage
> drop across the speaker terminals then using the formula P = V * V / 
> R
> to determine power dissipated.  Since the speaker is 4 ohms this 
> would
> give a voltage drop of about 0.45 v for about 50 mw of output.  I 
> expect
> this is too simple an explanation.
> 
>  
> 
> And thirdly, the instructions say to turn the volume control to 
> maximum
> and that creates a very load output from the speaker, enough so that 
> I
> am force to reduce the volume to keep ear damage.  Is it ok to 
> reduce
> the volume control to maybe half way without affecting the 
> alignment?
> 
>  
> 
> Thanks for the lists help.
> 
>  
> 
> Bob KG6TGI
> 
>  
> 
>  
> 
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