HR-10 - HW-16 repair

Heinz und Hannelore Breuer hbreuer at DEBITEL.NET
Fri Aug 10 10:17:43 EDT 2001


older electrolytics had a tolerance as wide as -50%/+80%. New
electrolytics have tighter tolerances. Replacing an old electrolytic
with a new one which has 5 or 10 times the original value will cause
trouble. The inrush current to the larger electrolytic might destroy the
rectifier and/or transformer. If your circuit uses rectifier tubes check
the tube data manual for the maximum capacity specified.
I had no problems so far using new electrolytics at up to double the
original value.
I just recapped a Collins 516F-2. It had several capacitors at 15uF and
30uF. I replaced them with 22uF and 47uF without any problem. If your
supply uses electrolytics connected in series for the high voltage it is
a good idea to have several capacitors availabe and select them for
equal value. Any cheap capacity meter will be sufficient, you don't need
the exact value just an equal reading. Even a voltmeter, a resistor in
the Megohm range, a D-cell and a watch will do.

Heinz KM5VT

Larry Knapp wrote:
> Thomas - Replacing the electrolytics in the HW-16 with the same value would be
> certainly OK...I was of the school of thought that perhaps increasing the
> capacitance would allow for better regulation, less hum...etc.  Always believed
> that and did that in my receivers and transmitters.  Within the past few months
> Electric Radio has had a great series of articles about repair of receivers
> (four part series) - transmitter series is upcoming.  One thing that was
> discussed was power supply capacitance in receivers.  Since I do not have the
> article here at work, but I believe the author said that one should replace the
> capaitors with the same value as the rest of the electronics is expecting that
> kind of regulation voltage...etc.  A larger capacitor could damage the rest of
> the circuits.  Obviously sometimes one cannot find the "exact" replacement but
> something close enough (I personally would go slightly higher) should be OK.
> Good luck.  Larry, KC8JX  St. Joseph, Mi
> --- Thomas Beltran <tbeltran at EARTHLINK.NET> wrote:
>  Tom W6EIJ
> > P.S.   On another note, the electrolytics are leaking on the HW-16.  I was
> > thinking that it might be better to use replacements with a higher
> > capacitance - any ideas how much I could increase the values?
> =====
> May your days be full of sunshine and good thoughts fill your head.
> From: Larry Knapp, KC8JX, St. Joseph, Mi  49085
>   Best 73's
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