[Hallicrafters] Capacitor identification. - go 630V or higher

[Roger Halstead (K8RI)]

> Waldo,
>
> Use 630V Capacitors and replace everyone of them,that is not a Mica or a 
> Ceramic capacitor.
>
> Warning, the Micas and the Ceramics can be bad too, took me a lot of time 
> to locate a leaky

I had three of them go bad in an HT 44 that was less than a year old.
Driver to final coupling cap and two bypass caps in the driver circuit.

I also had two go bad in the matching SX 117 receiver which I had also 
purchased new.

Being both were purchased at the same time and the caps were all 0.01 as I 
recall makes me think they may have gotten in a bad batch. Unfortunately 
they worked for a little less than a year in the transmitter and a bit over 
a year in the receiver.

Roger Halstead (K8RI, EN73 & ARRL Life Member)
N833R, World's Oldest Debonair (S# CD-2)
www.rogerhalstead.com
> ceramic cap in a SX-111, causing a loud annoying crackle on strong 
> signals, should have replaced
> them all in the first place.
>
> I work through the Radio with the Circuit diagram in front of me and use a 
> highlighter pen on the
> circuit to mark off what I have replaced. This is good for finding 
> "modifications" that should be
> reversed. These rigs were very well designed in the first place....
>
> Rodney
> VK2KTZ
>
>
> --- Waldo Magnuson <magnuson at mac.com> wrote:
>
>> I've been UNable to find the voltage color code for color bands 4 and 5
>> for the "Black Beauty" capacitors.  In the SX-100 I am looking at there
>> appear to be 3 sizes of black beauties - all have 5 color bands.  The
>> first three bands give the capacitance value, the forth band is black
>> (I think - it's faded), then there is a space followed by a fifth band
>> which is either blue or red in the capacitors I see.  There are three
>> sides:  0.305 in. Dia. x 1 in. Len., 0.443 in. Dia. x 1 3/16 in. Len.,
>> and 0.615 in. Dia. x 1 3/4 in. Len.
>> My questions are:  Does the color code specify the voltage rating, or
>> does the size specify the voltage rating, or is it a combination?
>>
>> Sort of a related question is that I also see "Black Cat" (black body)
>> and "Tiny Chief" (red body) both with values stamped on them.  The
>> Black Cat and Tiny Chief are molded capacitors and look pretty much
>> like the Black Beauties.  Are all three of these capacitor types to be
>> considered the same - namely REPLACE?
>>
>> Thanks,
>> 73,  Skip Magnuson  W7WGM
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>
>
>
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