Work Day 4th December 2021

T86

Here you see one of the clamps for the waveguide desiccators received a final top coat.

These clamps, of which there are many, have been cleaned, corrosion treated, primed and top coated.

Next phase of refurbishing the RAM on the base of the pedestal has been carried out. The surface cracks and deteriorated areas on the rubber surface of the RAM have been skimmed using Sika 221 sealant, a sealant that can be sanded and painted.

Note the RAM panel on the left has its surface completely skimmed due to the number of cracks. Next task is to lightly rub down the skimmed areas before painting with rubberised paint.

More work on restoring the chassis was carried out.

The main chassis structure and components are being painted black after the anti-corrosion primer has been applied. The top coat is a specialist vehicle chassis paint.

LCP

It was the intention to remove the Argus 700 cards yesterday for storing over winter. Good plan until it was discovered all the storage boxes had been used. A job now postponed.

The LCP always gets a good warm through (anti damp) during a work day using a fan heater.

At the end of the day the simulator was switched on and remains serviceable.

Away from Cosford

FT81 Monitor: Our monitor has taken a few minutes for the Horizontal Hold to steady down and the trimmer resistor is at the end of its adjustment range. See accompanying photo of the Deflection PCB with components removed.


Two potential problems with the Deflection PCB on the FT81, the electrolytic capacitors and the trimmer potentiometers, both deteriorating with age. Previous experience on other equipment has shown that all electrolytics and trimmers should be removed and tested. The results so far is that one electrolytic and one trimmer are U/S. The trimmer concerned is the Horizontal Hold which is not 100K but 71K, so that makes sense. Spares are on order.

Pedestal Motor: New bearings have arrived. Luckily imperial sized bearings are still readily available.

The replacements are shielded as the original bearing had separate shielding plates. The original bearing in the photo has been cleaned but remains locked solid!

Pete H

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