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Old 7th January 2006, 05:30 PM   #1
anatech is offline anatech  Canada
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Default RCA 151 'scope

Hi all,
It's time I have to repair my antique RCA 151 1" oscilloscope. I can't seem to find anything on the web.

Inside it's marked TVM-175, made in Montreal, Canada. It's a real oldy!

Any tips or info would be appreciated.

-Chris
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Old 7th January 2006, 05:30 PM   #2
anatech is offline anatech  Canada
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Rear view
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Old 7th January 2006, 05:36 PM   #3
poobah is offline poobah  United States
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Take some toothpaste, shine the old girl up, use some brown laquer on the strap, get some neon green fingernail polish and paint a trace on the tube, cut one of power leads on the inside, set it in the livingroom, convince the wife it IS art, get 12 Molsen's and call it good.
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Old 7th January 2006, 05:38 PM   #4
anatech is offline anatech  Canada
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Default And the bottom of the chassis

All I have done so far was to clean the controls, this is the way I got it otherwise. It has been serviced before.

It uses a 913 display tube, a pair of 6C6, an 80 (of course!) and an 885 gas thyratron triode.

Most of the capacitors are original, I want to replace only the ones I have to. (against my own normal advice). I will clean up the previous work. I had though I had gone over this before completely, wrong.

-Chris
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Old 7th January 2006, 05:42 PM   #5
anatech is offline anatech  Canada
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Hi poobah,
Nah, it did work. The 913 is good. I want it to work again.

It's the other half of my tube hobby that doesn't make noise. I do have to clean it up. The knobs are about to go into the ultrasonic cleaner. I will use a toothbrush (gently) on the front panel.

This was built in the late 30's I think. It deserves some respect. Only because it still exists if nothing else.

-Chris

BTW poobah, quick response!
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Old 7th January 2006, 05:49 PM   #6
poobah is offline poobah  United States
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Alright

Here's a guy with an operators manual...$14

http://www.agtannenbaum.com/r_cat.html#RCA

Just use an old tee-shirt (cotton only) on the front with watered down tooth paste. Nylon bristles will scratch...honest.
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Old 7th January 2006, 05:50 PM   #7
Netlist is offline Netlist  Belgium
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Chris,
Nice piece of hardware. I see what I think is a burned resistor (between the yellow and orange one) and i bet you'll end up replacing all the caps. Shall I dig up a schematic?

/Hugo
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Old 7th January 2006, 05:58 PM   #8
anatech is offline anatech  Canada
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Hi poobah,
If I can get this fella working I may buy that manual. First I need to fix it. Looks like someone just got it going, then I cleaned the controls.

Hi Hugo,
If you can dig anything up on this, I'll be very impressed! It's an oldie. So, YES! Thank you very much!!

The resistor does look burned in the picture. It's a 2K, measures 2.13K. Not bad for the age. Sadly, I believe you are right. Many paper caps that may be bad. All kinds of soldering. I just wanted to leave it as stock as possible.

I do have to clean up the replacement electrolytics.

It's all my fault. I should never have dug it out. Ignorance is bliss!

-Chris
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Old 7th January 2006, 06:12 PM   #9
poobah is offline poobah  United States
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Chris,

Copy this inot your browser: look about 1/3 1/2 down the thread, this guy has manuals:

http://216.109.125.130/search/cache?...icp=1&.intl=us


This guy has stuff for TVM-122 oscillograph

http://www.sarrio.com/sarrio/rsman3.html
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Old 7th January 2006, 06:13 PM   #10
poobah is offline poobah  United States
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Cr4p,

The link won't work

Pm me and I'll reply with it...
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