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 Post subject: Western / Hickok KS-15560-L1 vs KS-15750-L1 tube testers ??
PostPosted: Feb Mon 05, 2018 2:16 am 
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Joined: Apr Mon 03, 2017 1:19 am
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Western Electric / Hickok tube tester KS-15560-L1 vs KS-15750-L1 ?? How do they compare ? From what I have seen , the 750 seems to be similar to the 539 ( 750 having a more stable power supply ) . I cannot find much information on the 560 . Can anyone help with this ? Is the 750 a more desirable tester than the 560 ? Thank you for your help !!


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 Post subject: Re: Western / Hickok KS-15560-L1 vs KS-15750-L1 tube testers
PostPosted: Feb Mon 05, 2018 2:12 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 2328
Location: Sunbury, Ohio 43074
Quote:
Is the 750 a more desirable tester than the 560

"Desirable" is in the eye of the beholder. What is your intended use for a tube tester?

My brief look into the differences indicate that the 15560 and 50 are not terribly different. It may be that the 60 was updated by WE to handle more specifically WE made tubes, but that would take a bit more research. They appear quite similar in most regards, being derived from the mighty Hickok 539. You would have to do some research to determine what the exact differences between the two are.

Likewise, the 750 is a well respected tester, but without doing a side by side comparison in depth (which is beyond the scope of "my available time" this morning), it would be incorrect to label one "better or more desirable" than the other. They all use the same Hickok circuitry and are all well respected.

If you can post some specific questions after researching the differences, OR someone is intimately familiar with the specific differences between these, more specific answers could be provided.

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 Post subject: Re: Western / Hickok KS-15560-L1 vs KS-15750-L1 tube testers
PostPosted: Feb Mon 05, 2018 3:00 pm 
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I know the 750 have separate screen and bias power supplies . Mainly wondering if the 560 has that as well . 750 was made a couple of years after the 560 and has a few more features .


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 Post subject: Re: Western / Hickok KS-15560-L1 vs KS-15750-L1 tube testers
PostPosted: Feb Mon 05, 2018 3:39 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
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Location: Sunbury, Ohio 43074
You can find the manuals and schematics on bama, or steve johnsons website, or a few other places with a bit of poking around

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 Post subject: Re: Western / Hickok KS-15560-L1 vs KS-15750-L1 tube testers
PostPosted: Feb Mon 05, 2018 3:42 pm 
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Joined: Aug Wed 31, 2011 11:23 pm
Posts: 443
Location: Tucson, AZ
The WE versions and RD1575 had a filtered DC bias supply and the screen supply was separate as opposed to shared with the bias. Otherwise they are very similar to the 539B/C tube tester. These changes were made so the WE testers could test WE tubes. You cannot reliably test directly heated tubes on the Hickok 539B/C, because of the low signal voltage and unfiltered bias introduce too much signal noise. In filtering the bias voltage, it changes the operating characteristics of the tube in the Hickok circuit, so both Gm and plate current readings are significantly different at the same operating voltages. Thus the role charts are different. Otherwise for testing most tubes they would be comparable with their ability to test tubes and give meaningful results. The WE and RD tube testers command a higher price because of their uniqueness and branding.
Comparison is below:
https://www.sarsradio.com/index_htm_fil ... 021917.pdf


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