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 Post subject: Beckman 5350 VOM
PostPosted: Sep Mon 21, 2020 1:18 pm 
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Location: Hutchinson,Kansas
Picked up this Beckman last weekend. Its a giant unit. Not much info on it out there in the internet world. I did find a manual for it I had to pay for. Spent yesterday going thru it. I still have more to do on it but its awake again after who knows how long. I need to find a probe for it as it didnt come with it. It was 845$ in 1958. I suppose it should be in a museum but I hope to use it for work on the bench and keep it alive for many more years. Its amazing inside with all the routing and solder work! Would like to hear if anyone else has one or used one back in the day. I will post more as I go through it. I hope afterwards it can get scanned by the search engines and be on the internet.

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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Mon 21, 2020 3:44 pm 
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Location: Sanford Fla 32771 (USA)
Very interesting. That's a lot of vacuum tubes !
One picture shows 63 volts AC, was it really 63V or something else ?
Are those transistors in the picture ?


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Mon 21, 2020 4:21 pm 
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pauls.ironhorse wrote:
Very interesting. That's a lot of vacuum tubes !
One picture shows 63 volts AC, was it really 63V or something else ?
Are those transistors in the picture ?



Its not calibrated yet. It had just come to life and was trying to get stable. Wasnt measuring anything yet. It did settle down to 003.


Todd


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Mon 21, 2020 4:58 pm 
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Location: San Diego, CA
Looks like 0.63 volts. Note the decimal point.
That is a cool looking old meter. I used to have an HP frequency counter with those same type of readouts. It was a beast. Took up half my workbench.
Rick


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Mon 21, 2020 5:01 pm 
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Location: Sanford Fla 32771 (USA)
gridleakrick wrote:
Looks like 0.63 volts. Note the decimal point.
That is a cool looking old meter. I used to have an HP frequency counter with those same type of readouts. It was a beast. Took up half my workbench.
Rick

Aaahh yes, thanks, makes perfect sense now.

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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Tue 22, 2020 2:33 am 
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I've never seen a Beckman DVM like that. I do have one of their EPUT meters (counter). I had problems with some bad (leaky) capacitors in the strip indicators. They looked like the old 6-dot mica caps but I don't think they were; they had like a wax coating.


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Tue 22, 2020 2:42 am 
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CurtisL wrote:
I've never seen a Beckman DVM like that. I do have one of their EPUT meters (counter). I had problems with some bad (leaky) capacitors in the strip indicators. They looked like the old 6-dot mica caps but I don't think they were; they had like a wax coating.



This one is not reading. Went thru more stuff today. Its not reading anything off the probe. The 1volt calibration supply is working. Have to dig into it more as the weeks come. I have never worked on anything like this before. It may be above my skill level but I do have a friend who can help me if needed.


Todd


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Tue 22, 2020 2:57 am 
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Joined: Jan Tue 10, 2012 8:39 am
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I don't see the pictures.


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Tue 22, 2020 3:11 am 
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bob91343 wrote:
I don't see the pictures.



They are there!


Todd


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 Post subject: Re: Beckman 5350 VOM
PostPosted: Sep Tue 22, 2020 12:52 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Making For Arcady ........from 11733
I have the portable Beckman 5230B EPUT counter that is a twin of this splendid meter. Should that 5350 ever over-stay its welcome, please let me know, and I would be glad to give it a new home.

I’ve heard about possible bad condensers in the DCUs, though my full-size Beckman 7360 EPUT still works properly without any repair or restoration, so this problem may be isolated to certain periods of manufacture. I can’t say anything about the 5230B; when I plugged it in some years ago, a resistor in the B+ line quickly burned out, and I haven’t had a chance to get to the repair, though my recollection is that the electrolytic filter condensers were not excessively leaky.


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