Mapleman, an old detector that works is better than no detector at all. But unless you have some technical knowledge, I'd plan on upgrading soon... (you can get hooked very easily). And the person who built yours might have been very good.
In the meantime you might find these urls helpful:
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http://www.hobby-hour.com/electronics/s/groundtrack-gr1290.php
you may be able to get your hands on a manual at
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http://www.d8apro.com/
or here
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http://www.vintagemanuals.com/index.html
(don't know what it will cost, but it may be reasonable)
Anyway, we're glad to have you here. Hope to hear from you, especially once you get the GD-1290 out in the field.
BA in Arizona.
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http://www.thunting.com/smf/index.php/topic,11947.msg77027.html#msg77027
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