AVO VCM MK1 calibration

AVO Ltd London made VALVE TESTERS.

AVO VCM MK1 calibration

Postby Muzzwell » Fri Dec 08, 2017 8:48 pm

Hi, I wondered if someone could help. I am trying to calibrate a MK1 VCM using the instructions in the MK2 manual. These were written in Dutch and English and produced by Hein Ros who has since sadly passed away. I am a Brit living in Holland and happen to speak Dutch. In his Dutch version of the calibrating instructions he refers to the use of the 5 hole connector on the top of the unit. These are labelled on the machine as: G1 - S - A1 - A2 - D1. Frustratingly in his instructions he keeps on referring to 'C'. For example: Attach testmeter (Avometer 8) to the contacts A1 & C on the 5 pole connector. This section is to check the mains voltage. He later keeps referring to contact point C. Does anyone know what he means by 'C' ?

Also in the instructions to the MK2 unit there are extra adjustable resistors it seems that were not on the MK1 model. I have done my best to calibrate using both the Dutch and English versions. Of course there are many variables. Not least of which being that the machine seems to need to warm up properly first. I have some reference tubes EL84 that were tested on another machine. Best I have to go on. Would anyone happen to know of a MK1 calibration article, I have searched including through the EMER manuals.

Any help much appreciated. I am not expecting this machine to be a precision instrument.

Kind regards,

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