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HBWOODY · 30th Dec 2020, 2:55 pm

With a valve under test I get a reading of 51mV across 1 and 2 of the amplifier board when the the ma/V switch is at positions 0-6, 0-20, 0-60. At the Cal position on the switch I get a zero reading.
Will now release the front of the 163 so I can have a closer look at the ma/V switch.

30th Dec 2020, 2:55 pm	#30
HBWOODY Pentode Join Date: Mar 2020 Location: Bodmin, Cornwall, UK. Posts: 212	Re: VCM 163 problem while calibrating With a valve under test I get a reading of 51mV across 1 and 2 of the amplifier board when the the ma/V switch is at positions 0-6, 0-20, 0-60. At the Cal position on the switch I get a zero reading. Will now release the front of the 163 so I can have a closer look at the ma/V switch.