UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

swordholder · 25th Jan 2010, 10:46 pm

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.

Regards

Mike

25th Jan 2010, 10:46 pm	#92
swordholder Rest in Peace Join Date: Aug 2009 Location: East Preston, Sussex Posts: 162	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. Regards Mike