Off Topic - Need a source for repair on tube controlled device
Steve B.
I'm an old car nut mostly with a lot of interest but very little
knowledge of tube electronics (or electronics in general)
One of my cars has an auto dimming mirror which is basically a light
sensor and a relay that feeds a magnet. It has a 12X5 tube that I
have replaced (you can see the device @
http://c-i-f.ifrance.com/mirrormatic_1959.htm) (not my web page)
Anyway this one doesn't work. If I manually trip the relay it will
pull the mirror back but nothing I can do will make it work
automatically. This mirror is all but irreplaceable and my electronic
skills aren't anywhere near the level they would need to be to fix it.
Can anyone here recommend someone that would be willing and able to
take a look at it and get it working again for me? I am in the Tampa
area so the closer the better but I will ship anywhere the smart
person is.
Steve B.
Gary Tayman
I didn't read it in its entirety, but skimmed over it. What comes to my
mind is the photosensor. It has probably lost some sensitivity and so the
circuit is hesitant to trigger the relay. I don't know what the specs are,
or whether a modern photosensor would have similar specs, but my guess is
that's the root of the problem.
It's interesting to see another tube-controlled device in a car! Of course
there's the radio, then the auto-dimmer, now an auto mirror. Are there yet
other such devices?
--
Gary E. Tayman/Tayman Electrical
Sound Solutions For Classic Cars
http://www.taymanelectrical.com
"Steve B." <no...@none.com> wrote in message
news:dal3e1hq4ddh3vqlm...@4ax.com...
Tom Biasi
"Gary Tayman" <gta...@gate.net> wrote in message
news:e%oEe.3211$6f....@newsread3.news.atl.earthlink.net...
> That is quite a web page!
>
> I didn't read it in its entirety, but skimmed over it. What comes to my
> mind is the photosensor. It has probably lost some sensitivity and so the
> circuit is hesitant to trigger the relay. I don't know what the specs
> are, or whether a modern photosensor would have similar specs, but my
> guess is that's the root of the problem.
>
> It's interesting to see another tube-controlled device in a car! Of
> course there's the radio, then the auto-dimmer, now an auto mirror. Are
> there yet other such devices?
>
>
> --
> Gary E. Tayman/Tayman Electrical
> Sound Solutions For Classic Cars
> http://www.taymanelectrical.com
>
>
before you start digging in the circuit.
Tom
Steve B.
wrote:
>That is quite a web page!
>
>I didn't read it in its entirety, but skimmed over it. What comes to my
>mind is the photosensor. It has probably lost some sensitivity and so the
>circuit is hesitant to trigger the relay. I don't know what the specs are,
>or whether a modern photosensor would have similar specs, but my guess is
>that's the root of the problem.
>
>It's interesting to see another tube-controlled device in a car! Of course
>there's the radio, then the auto-dimmer, now an auto mirror. Are there yet
>other such devices?
Well the only other thing I can think of would be the hiway hi-fi
record player that was optional back then.
http://www.roadkillontheweb.com/arp.html
Steve B.
Tube was already replaced with no change in result. Thanx for the
advice though!
Steve B.
Bill Sheppard
which i have found very useful on occasion, in high impedance, low
voltage situations.
Use a water color brush that does not have a metal shank. Slightly
dampen it so it's slightly conductive, and use it to daub around in the
suspected area (while the unit is under power, of course), watching for
the result. In this case, the photo sensor and tube input area would be
suspect. This trick has been known to instantly isolate the bad part.
Bill(oc)
Gary Tayman
radio. I don't believe there's any circuitry, only a connector that plugs
into the radio.
"Steve B." <no...@none.com> wrote in message
news:q3h4e1l075bbmdr6o...@4ax.com...
John Goller, k9uwa
says...
>
>
>Hi All:
> I'm an old car nut mostly with a lot of interest but very little
>knowledge of tube electronics (or electronics in general)
>
>
>
Neat Gadget that Mirror.... if the resistors are still correct
resistance... and the tube is good... then the only thing left
that could be hosing up the curcuit would be the lack of sensitivity
of the Photo Cell ...
maybe one of our guys can find a suitable replacement?...
John k9uwa
Radio Rambler
i looked at the schematic & come to the conclusion that the 12X4 does not
belong there, in fact, the circuit calls for a low voltage triode or
pentode (like the ones that were used in the late fifties.
a 12X4 is a dual diode that is commonly used as a rectifier & it relies on
high plate voltages no less than 200 VDC.
i would bet that the circuit calls for a 12K5, in fact, i am sure that it is
what it calls for
http://www.nj7p.org/Tube1.php?tube=12k5
--
The Shadow Knows
Radio Rambler
the author of that website is wrong regarding the type of tube used.
it IS a 12K4
--
The Shadow Knows
Tom Biasi
"Radio Rambler" <j...@jam.com> wrote in message
news:3kflskF...@individual.net...
Radio Rambler
> Where do you see a 12X4?
in both the OP & the webpage that was refferenced
--
The Shadow Knows
Radio Rambler
sorry, my mistake
--
The Shadow Knows
Radio Rambler
that 12X5 must be a really oddball tube. it does not show up in any of the
online tube databases & it it is not listed in my 1960 RCA rube manual.
however, i do have a hunch that the 12K5 i previously mentioned is close.
i have never seen a 12X5
--
The Shadow Knows
Radio Rambler
are you sure that it calls for a 12X5. the schematic has it marked as a
12K5.
i cant seem to find any info on a 12X5, however, the data for the 12K5
appears to co-incide with the schematic.
--
The Shadow Knows
Tom Biasi
It is a 12K5, the OP must have misread it.
Uncle Peter
Check the grid voltage using a high impedance VTVM or digital meter
for a change in voltage as light is shined on the photocell. The grid
should go more positive as the light intensity is increased. Or, you
could just bridge the CdS cell with a 10k resistor and see if the
relay then pulls.
If the cell is bad, it is probably a LDR (light dependent resistor)
type and is most likely a CdS type cell (Cadmimium Sulphite).
You could probably steal one from an old photometer.
Pete
Jeffrey D Angus
Uncle Peter wrote:
> If the cell is bad, it is probably a LDR (light dependent resistor)
> type and is most likely a CdS type cell (Cadmimium Sulphite).
>
> You could probably steal one from an old photometer.
They're still available every where... From Radio Shack through
Mouser and a variety of surplus places.
Jeff
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety." Benjamin Franklin
"A life lived in fear is a life half lived."
Tara Morice as Fran, from the movie "Strictly Ballroom"
Tom Biasi
" Uncle Peter" <radiocon...@cox.netSPAM> wrote in message
news:tpPEe.158119$go.155463@fed1read05...
mode off.
Bill Sheppard
>...it is most likely a CdS type cell
>(Cadmimium Sulphite).
Duzzat go with the capacitator in the horizontical circuit? :-) oc
Uncle Peter
"Tom Biasi" <tomb...@REMOVEoptonline.net> wrote in message
news:XRPEe.13099$_x.1...@fe11.lga...
>
> Nickpick mode on>>>> You probably mean "Cadmium Sulfide" >>>> nickpick
> mode off.
>
>
Sure, pick on the old farts. But, in 20 previous replies, no one
else mentioned it.
O.F.
Tom Biasi
" Uncle Peter" <radiocon...@cox.netSPAM> wrote in message
we like to use the term nickpick, it looks like it crept into my post.