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 Post subject: Simpson 1000 vs Motorola 59K1
PostPosted: Aug Sat 12, 2017 12:25 am 
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Joined: May Fri 06, 2016 11:58 pm
Posts: 50
Location: Chicago
Hey All,

I was recently given a Motorola 59K1 but am 50/50 on refurbing it. The problem is there are 3 tubes in it (a 75, a 41 and an 80) that I can't test on my Simpson 1000 tube tester. It's got the socket for it but those tubes are so old that they aren't listed in the manual. I would hate to start replacing caps only to find that the tubes are dead. I can ohm out the filaments but does anyone know a way to test the tubes either on the 1000 or off?

Thanks
Matt


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 Post subject: Re: Simpson 1000 vs Motorola 59K1
PostPosted: Aug Sat 12, 2017 1:19 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 35760
Location: Livermore, CA
Matt

Most likely tubes are good. Even if they aren't replacements are available at low cost.

75 is similar to 6Q7 with a different base.
41 is similar to 6K6 with a different base.
80 is similar to 5Y3 with a different base.

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Norm


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 Post subject: Re: Simpson 1000 vs Motorola 59K1
PostPosted: Aug Sat 12, 2017 1:53 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1660
Location: Illinois
Unless proved otherwise, by substitution, any old tube that lights up is probably OK. Go with it.

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Doug


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 Post subject: Re: Simpson 1000 vs Motorola 59K1
PostPosted: Aug Sat 12, 2017 4:09 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1899
Location: Oswego, NY, USA
Your Simpson Model 1000 tube tester will test the types you've listed above, and they are all listed in the Simpson 1000 roll charts (particularly on the older roll charts, before about 1960) and in the Simpson supplement charts that are listed on the site www.simpson260.com ; from the first page, click to page 2, then scroll thru the second column to Simpson 1000 documents, which I had donated to Paul's site some yrs ago. And since the Simpson 1000 is similar to Eico model 666 (and 667), you can also find data for these tube types for your model 1000 at bama-edebris (google for the exact address), under "Eico 666-05" data files. You can use the two labeled simpson1000-Eico photos from the simpson260 site to help make the switch lever translations to make the Eico charts work on your Simpson; it also works the other way around, to use Simpson1000 data charts with an Eico 666 or 667 tester. I mention both the Simpson and Eico sets of data, because they were edited differently...by different people and in different yrs; and both are useful, especially if you run into a problem getting one of the sets of data to work with your tester. Two major circuit differences between the Simpson and Eico are their inter-element leakage circuits and the Simpson not having the transistor test circuit. So, the chart data is all there for the Simpson 1000, and Eico 666 or 667 data also works by using the panel switch translations.


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 Post subject: Re: Simpson 1000 vs Motorola 59K1
PostPosted: Aug Sun 13, 2017 3:41 am 
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Joined: May Fri 06, 2016 11:58 pm
Posts: 50
Location: Chicago
Hey Fred,

Thanks for that link. I had the roll that came with the tester and a few I had downloaded from the interwebs, but none had those tubes.

Peace
Matt


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