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Electronic Equipment > Electronics Repair > Re: Ekco CR280 ...
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Re: Ekco CR280 valve/tube car radio, 1950s

by oldcoot <oldcoot7074@[EMAIL PROTECTED] > Jun 25, 2008 at 12:46 PM

A factoid about synchronous vibrators - a radio using one is polarity-
sensitive. That is, if the radio is negative ground, you cannot run it
positive-ground. If you do, the power supply will generate "B-
negative" instead of B-plus, putting reverse polarity on the filters
(smoothers). But a radio using a tube rectifier will run OK on either
ground polarity. Most will even run on AC, but with some wierd 'beat'
effects with the mains frequency.

Now a synchronous vibrator *can* be used with opposite ground by
simply reversing the two transformer secondary leads that would
normally go to the plates of a tube rectifier.
 




 9 Posts in Topic:
Re: Ekco CR280 valve/tube car radio, 1950s
oldcoot <oldcoot7074@[  2008-06-25 12:46:36 
Re: Ekco CR280 valve/tube car radio, 1950s
"N_Cook" <di  2008-06-25 22:16:36 
Re: Ekco CR280 valve/tube car radio, 1950s
"William Noble"  2008-06-25 20:11:07 
Re: Ekco CR280 valve/tube car radio, 1950s
"N_Cook" <di  2008-06-26 08:05:45 
Re: Ekco CR280 valve/tube car radio, 1950s
"N_Cook" <di  2008-06-26 15:44:52 
Re: Ekco CR280 valve/tube car radio, 1950s
Jeffrey D Angus <jangu  2008-06-26 08:50:16 
Re: Ekco CR280 valve/tube car radio, 1950s
"N_Cook" <di  2008-06-26 17:27:23 
Re: Ekco CR280 valve/tube car radio, 1950s
Jim Adney <jadney@[EMA  2008-06-26 23:27:38 
Re: Ekco CR280 valve/tube car radio, 1950s
"N_Cook" <di  2008-06-27 12:27:53 

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tan12V112 Fri Nov 21 6:00:19 CST 2008.