[time-nuts] The "NAKED" 5065A optical unit

[cdelect at juno.com]

Paul,

You do NOT want to take one apart to this level!

It's never going to operate again.

If you look at the lamp in the PIX you will see a white coil wrapped
around the bulb.

This is the tank for the 90Mhz drive and it sits cocked at a 45 degree
angle.

The lamp assy can be removed easily via 3 small screws and repaired or
modified.

The Lamp circuit is designed to put out a bit higher RF level and once
the lamp starts it drops down a bit.

I would question re-engineering the lamp circuit as it can easily reach
1.5X10-13th at 100 Sec stability and 5X10-14th at 100 Sec. with the
filter mod.

Unless you have a maser or BVA to compare against how will you know if
any modifications are going to help or hurt?

The only thing I replace even if it measures OK is the 1.33K resistor as
it will "crack" eventually and change value.

A 1.3K 5% 1W metal oxide works well.

Cheers,

Corby