[time-nuts] The "NAKED" 5065A optical unit
paulswedb at gmail.com
Tue Feb 20 13:10:16 EST 2018
Corby no intent to rework the bulb.
Its just I have had good success with bulbs from the FE-XXXX series when
they fail to operate by heating the bulb to re-vaporize the "Stuff" that
plates out. Wasn't sure if this would be an approach on the 5065 when that
day comes for mine.
On Tue, Feb 20, 2018 at 1:03 PM, <cdelect at juno.com> wrote:
> 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
> The lamp assy can be removed easily via 3 small screws and repaired or
> 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.
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