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 Post subject: Ballantine 300
PostPosted: Jan Tue 10, 2017 1:12 am 
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Joined: Nov Tue 23, 2010 6:49 pm
Posts: 236
Does anyone know the specified full scale deflection current for the meter movement in a Ballantine 300 (no suffix)?

I measured about 400 microamps without the meter movement cover and about 500 microamps with the meter movement cover.

Curly


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 Post subject: Re: Ballantine 300
PostPosted: Jan Tue 10, 2017 2:05 am 
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Joined: Dec Sun 21, 2014 6:37 am
Posts: 975
Location: Portland, TN, USA
The manual which I can send you if you don't have it says

"M1 - Special type meter can only be obtained from Ballantine"

Of course if you already have the manual, you already know this.

_________________
73, Chuck K4CCW
You can't reason a person out of a position they weren't reasoned into.


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 Post subject: Re: Ballantine 300
PostPosted: Jan Tue 10, 2017 4:44 am 
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Joined: Nov Tue 23, 2010 6:49 pm
Posts: 236
Hello Chuck,

Thanks, I already have the manual.

This is actually a Weston #643 logarithmic meter movement, so no zero! With no input, the needle is pegged to the left side, off scale. This is normal.

I was wondering how the magnets held up after sixty years, i.e. loss of strength. So, I looked for the FS deflection spec in the manual -- not given. No doubt that some enterprising Ballantine fan has been where no man has gone before.

Curly


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 Post subject: Re: Ballantine 300
PostPosted: Jan Wed 11, 2017 8:44 pm 
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Joined: Nov Tue 23, 2010 6:49 pm
Posts: 236
A side note. Why did Ballantine use a hand calibrated log meter movement?

http://lcweb2.loc.gov/master/mbrs/recording_preservation/manuals/Ballatince%20Electronic%20Instruments%20(catalog).pdf

Curly


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