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Ferguson 2000 · 18th Mar 2017, 12:46 pm

Hi Andy,

The M in the model number could indicate that it was a set that was sold, possibly through a dealer rather than rented, not a certainty as sometimes we ran short of sets for the Radio Rentals branches.

Lack of height can be a low A1 voltage which, if severe, could also dim the picture. The usual cause was a preset resistor going low in value which I think was the focus adjustment, it is situated at the bottom of the timebase panel on the left. There was a modification, which from memory, was to increase the value of the preset. In practice the earth end was usually disconnected with a pair of wire cutters! Well we did have fourteen or more calls a day to go to......

I am away from home at present so cannot refer to service manuals or notes and the above is from memories of forty five years ago.

Best wishes, Geoffrey.

18th Mar 2017, 12:46 pm	#7
Ferguson 2000 Tetrode Join Date: Jun 2008 Location: Stratford upon Avon, Warwickshire, UK. Posts: 80	Re: BAIRD M628 series 620 Hi Andy, The M in the model number could indicate that it was a set that was sold, possibly through a dealer rather than rented, not a certainty as sometimes we ran short of sets for the Radio Rentals branches. Lack of height can be a low A1 voltage which, if severe, could also dim the picture. The usual cause was a preset resistor going low in value which I think was the focus adjustment, it is situated at the bottom of the timebase panel on the left. There was a modification, which from memory, was to increase the value of the preset. In practice the earth end was usually disconnected with a pair of wire cutters! Well we did have fourteen or more calls a day to go to...... I am away from home at present so cannot refer to service manuals or notes and the above is from memories of forty five years ago. Best wishes, Geoffrey.