Avo mk2 valve tester help required

[oceanobsession]

The black tester on the left in your photographs is a VCM Mk.I not a Mk.II - the main visual difference is the lack of chrome handles on either side of the front panel. The two models are essentially the same but note - not completely identical, there are subtle circuit differences.

Regards

Hi I did notice that it had three transformers inside and the other pair have two , I did struggle a bit with the manual but there is a quick ref card in the lid off the one that is great to follow , what does the switch do which is the one like the on and off switch 1x and 8x I think it said ,
cheers phil.