07-10-2021, 06:56 PM
(This post was last modified: 07-10-2021, 07:05 PM by Mike Watterson.)
Thanks BusyBee aka Tracy, so my memory that it was somehow a NASA document with Russian sources was correct. I wonder what Electrometer circuit NASA are using today on Mars? Yes, at least on Rover has an Electrometer.
I have an old Japanese VVM with 100 M Ohm input impedance. Some DVMs are 1 M, some 10 M and some are 100 M.
The datasheets suggest only the ЭМ-10 could be a rod tube and all may use a top wire for g1 rather than the anode. However the ЭМ-9 may be an interesting dual triode for a mains based, or car battery amp. The ЭМ-8 and ЭМ-9 seem to be 6.3V 100 mA heaters and run on low anode voltages. Though many "mains" valves to work on 12V HT, see car radios. The ECH83 is actually just an ECH81, either can use 12V or 150V HT as they are just labels.
I have an old Japanese VVM with 100 M Ohm input impedance. Some DVMs are 1 M, some 10 M and some are 100 M.
The datasheets suggest only the ЭМ-10 could be a rod tube and all may use a top wire for g1 rather than the anode. However the ЭМ-9 may be an interesting dual triode for a mains based, or car battery amp. The ЭМ-8 and ЭМ-9 seem to be 6.3V 100 mA heaters and run on low anode voltages. Though many "mains" valves to work on 12V HT, see car radios. The ECH83 is actually just an ECH81, either can use 12V or 150V HT as they are just labels.
