I'm trying to fix this antique black and white tv.
There's a part in the tv that says .001 uufd on it. On the other side
it looks like a domino with 6 colored dots. The dots are different
colors, the thing is rectangular with a wire on each end. It is about
1 inch long a half inch wide and 1/8 inch thick. Flat package. I
know it's not a chip or power transistor becaue this is a tube tv set.
It dont look like a resistor. Capacitors are usually labelled MFD
(microfarad). What the heck is uufd?
These antique electronics sure have some weird parts, even though they
are built like army tanks.
I wish I had a tube tester....... They all light up !
Another thing. I notice corrosion around one of the filter caps. I
bet it's leaking. It's a metal can about 4 inches tall, 1.5 inches in
diameter, and it has 3 leads on the bottom. (3 caps in one can)
Where can I get a replacement?
I get nothing on the screen, but there is a loud hum coming from the
speaker, which happens to be a the weirdest speaker I ever saw. It's
got a coil where there would normally be a magnet and an extra set of
wires going to the chassis. No parts look burned.
On Wed, 01 Aug 2007 02:51:13 -0500, firstname.lastname@example.org wrote:
uufd means micro-micro farad. Now it's called picofarad. You have a
.001 picofarad capacitor. (This is a very small value, are you sure
you have the decimal point right?) The colored dots were a type of
color code for capacitors, similar to the color rings on resistors.
They were often called domino capacitors; you can search for that
You are probably right about the filter cap, it is common for them to
dry out and fail. It's pretty hard to find multi-section filter caps
any more (at least that aren't old an dried up). You can replace with
three separate caps with the minus sides (usually) tied together.
Failure of this cap would likely explain the loud hum. Do a google
search for multi-section capacitor to find sources and suggestions.
And you have an electromagnet speaker. Instead of a permanent magnet,
it used a second coil driven with DC to create the magnetic field for
the other coil to work against.
Good luck, you're going to need it! And there are still plenty of
enthusiasts around with tube testers; you're going to need that too!
Actually that's backwards...
A microfarad (uF) is 1/1000000 (millionth) of a farad.
A nanofarad (nF) is 1/1000 (thousandth) of a microfarad.
A picofarad (pF, formerly known as uuF) is 1/1000 of a nanofarad or 1/1000000
(millionth) of a microfarad.
So pico is the smallest common unit, micro is the largest, nano is in the middle.
As another poster said, .001 picofarads is incredibly small, I've never seen a
commercial capacitor made with such a low
value. .001 uF is much more likely.
Incidentally, Google can do conversions like the above. Just enter "1
microfarad in nanofarads" and it'll give you the
Antique B+W TV sets were power hogs. I can't picture a picofarad cap
having an existence in the circuitry. Plus if the cap is physically
big enough to have color dots printed on it for cap value purposes its
likely a lot higher than the picofarad value.
uuF = MicroMicro Farads = Pico Farads. Rec.antiques.radio+phono group can
help out a lot more - there are some TV restorers in there . Someone might
have some things you're looking for.
You're right - there's no chips in that TV. But you best learn more of the
parts in there - some might be knocking you on your ass - if you're not
Doesn't it go: Micro, Nano, Pico?
so Micro = X10 to the -6
nan0 = X10 to the -9
and pico = X10 to the -12
so micro micro is X10 to the -12 or pico? and there fore .001 micro micro ,001 pico which is not a valid commercially available value
Sounds like you've got those units right. For some reason they don't
seem to use milli- (10^-3) or nano- with capacitors.
I don't know much about old electronic stuff, but in the more recent
stuff there are a lot of .001 uF (not uuF or pF) capacitors.
I was answering the "basic" question of uuF - and that was "before" i had my
coffee. I wasn't paying attention to the actual "value". Due to the back
ground of the poster - it "appears" he had limited electronics experience to
start with. I'm more concerned with his sticking his fingers in a place -
unexperienced, than a "Value" of a component.
Some of my first experiances with electricity.
My mother told me of the time I was spilling water in to the socket of a table
lamp I had unscrewed the light bulb.
The second time was with a remote control bus I had which worked
with a spark gap static transmitter. I had unscrewed the antenna and
poked my finger inside while pressing the transmit button. I remembered
this ocasion very well.
Watch out where you stick your fingers.
Ah yes, our formal learning years........ I used to stick my fingers in Lamp
sockets and turn them on - what a tingle! OR grab onto Antennas with a
transmitter turned on. No wonder I've got such an electrifying personality!
I produce sparks most of the time when touching metal or so on.
Hmmmmmmmmmmmm How I miss those years! I'll have to try to relive some of
those experiences for old time sake.
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