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Old 25th Jan 2010, 10:46 pm   #92
Rest in Peace
Join Date: Aug 2009
Location: East Preston, Sussex
Posts: 162
Default Re: The "Sussex" Homebrew Valve Tester.

Hi Top Cap,
There is no reason why you have to have 3 meters. You can switch, but bear in mind that the GM meter measures AC millivolts to a resolution of 0.1mV.
Obviously the meter sensitivity will have to taken into consideration, again the anode current meter is a 199.9mv DC meter with a resolution of 0.1mV.
I don't know the Lascar meters, are they analogue or digital.
I used the 3 meters because (a) they dont need any switching and (b) they are relatively cheap at around 6 each including carriage on E Bay (see my previous posts for address).
If you do use the Lascar meters, you may have to alter values of resistors around the circuit.


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