Try it on 12 VDC. If no cable just clip it in.
Mike AA8W
----- Original Message -----
From: "geoffrey mendelson" <geoffreymendel...@gmail.com>
To: <drakelist@zerobeat.net>
Sent: Saturday, November 07, 2009 2:20 PM
Subject: [Drakelist] SPR-4
I am now the proud owner of an SPR-4, serial number 5676. It looks
like it sat on a dusty shelf for a while, it is dusty and the ends of
some things, such as the screws, rf gain knob (if you can call it a
knob), are rusty.
It has two problems. One is the dial sometimes "sticks". The other is
a loud hum from the speaker no matter what setting of the audo gain
control.
Looking at the schematic, all of the power supply filtering is a
1000mf/25 volt capacitor. Is this the source of the hum?
Is it likely that it will reform by leaving the radio on for a few days?
Thanks in advance,
Geoff.
--
geoffrey mendelson N3OWJ/4X1GM
Jerusalem Israel geoffreymendel...@gmail.com
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