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Old 31st Aug 2021, 1:05 pm   #21
Skywave
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Arrow Re: Tube aka Valve Tester design

Quote:
Originally Posted by trobbins View Post
Note that making a DC supply for a valve heater that needs 1.5-3A, such as for a rectifier or an output stage sweep valve would typically subject a tester filament winding to a significantly higher current requirement (eg. 2x). So an internal DC supply is likely fine for say up to 1A heater valves, but a concern for higher current requirements beyond - say a 6L6.
O.K. so fit an additional mains transformer with a secondary winding that is capable for supplying that current and, if necessary, a discrete linear voltage regulator to handle that current, plus adequate thick wiring to reduce the voltage drop in that wiring.
Alternatively, use a suitable external d.c. source - as I have suggested.

Al.
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Old 31st Aug 2021, 1:24 pm   #22
Dekatron
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Default Re: Tube aka Valve Tester design

There are some nice school & physics power supplies like the IMPO ES 11.17 for 0-25VDC @6A which also has 0-30VAC @6A for heater voltages, with separate outputs for AC & DC.

IMPO also have a high voltage power supply IMPO ES 11.28 with 0-500V @ 50mA and 0-50V @15mA which works nicely for Anode & Grid Voltages, if you need a different Screen voltage you need a second one.

Unfortunately the IMPO series are discontinued but they regularly turn up on auction sites and there are other brands with similar specification for school/laboratory use that will do just as fine.

With these two power supplies you can test a lot of valves.

/Martin
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Old 31st Aug 2021, 8:15 pm   #23
Ed_Dinning
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Default Re: Tube aka Valve Tester design

Hi Folks, note that some of these supplies are variac based, but unlike normal variacs they have an isolated primary winding and the sec is the variac.
Very useful pieces of kit

Ed
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Old 5th Sep 2021, 4:57 pm   #24
Robert Gribnau
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Default Re: Tube aka Valve Tester design

This morning I uploaded my collection of data/pictures/etc. on valve testers to Google Drive. Maybe it can be of use for TS.

https://drive.google.com/drive/folde...Z3tFoaZxcrU7F2
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