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Old 19th October 2012, 11:22 PM   #1
HP8903B is offline HP8903B  United States
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Default Help: Hickok Western Electric KS-15750-L1 Tubes Tester Maintenance and Calibration

I recently got a Hickok KS-15750-L1 tube tester. I plan to calibrate it.
I will replace the 83 and 5Y3 rectifiers.

Are there any caps or other parts that I should replace ?
Also, any tips on maintenance, calibration, and operation would be appreciated.
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Old 20th October 2012, 01:04 AM   #2
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Verify all the resistors and pots are within tolerance. Replace any wax capacitors. Clean the rotary switch contacts with a good quality cleaner. One site had some really good cal procedures for Hickok testers, although you'll need a variac and a transformer.
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Old 20th October 2012, 01:15 AM   #3
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First, there are virtually no capacitors to replace because, like the Hickok 539 series that is very similar to yours, it runs on pulsating DC. And there are also littlel or no pots to tweak for calibration. There is a good artical by Daniel Schoo in the free on line download section of AudioXpress magazine on calibrating the Hickok testers. I'll try attaching it below.
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File Type: pdf Hickok539C schoo2798.pdf (596.0 KB, 37 views)
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Old 20th October 2012, 04:38 AM   #4
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I own a KS-5727-L1 which is similar to the Hickok 536 and it does have several capacitors. The parts list for the 539C shows seven capacitors.
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Old 20th October 2012, 05:22 AM   #5
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Do you guys know where I can get the adapters to test WE 205 and 101 tubes ?

The manual states that they are Alden No. 944 WEB and No. 978 WEB.
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Old 20th October 2012, 05:24 AM   #6
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I looked at the parts list and there are 7 capacitors.
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Old 20th October 2012, 05:34 PM   #7
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Quote:
Originally Posted by manp111 View Post
Do you guys know where I can get the adapters to test WE 205 and 101 tubes ?

The manual states that they are Alden No. 944 WEB and No. 978 WEB.
Oh man good luck with that. Have you seen what original WE sockets for those tubes go for on ebay? I'd buy a reproduction socket and wire a homemade adapter. I've never seen these tubes in person but do they fit in a normal UX4 socket? I think the only difference is where the locator pin sits.
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Old 20th October 2012, 05:38 PM   #8
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The location of the UX4 (300B) sockets are the same.
The difference is 205 tubes' 4 pins are the same size.

A 205 would fit into the 4 pin socket, but the heater pins wouldn't contact
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Old 20th October 2012, 05:52 PM   #9
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Quote:
Originally Posted by manp111 View Post
I looked at the parts list and there are 7 capacitors.
I meant there are no high voltage B+ electrolytic filter capacitors to replace like so many are obsessed with doing whether they need them or not. But yes, there are a few mundane capacitors in there. Like a couple of low voltage electrolytic dampeners across the meters which almost never go bad. And there is a low voltage electrolytic in the self bias circuit that usually spends it's life shorted out by the strap across the binding posts. Plus a couple small paper jobs in the noise circuit that never cause trouble. In fact the only one that sees any kind of voltage is the small filter in the negative bias supply. Happy now?
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Old 20th October 2012, 05:57 PM   #10
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Thank you for the thorough reply.

Yes. Good to know I do not need to replace the caps.
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