[time-nuts] HP 5245L Question

paul swed paulswedb at gmail.com
Sun Jan 10 16:38:32 UTC 2010


Arie,


On Sun, Jan 10, 2010 at 7:14 AM, arie schellaars
<arie.schellaars at yahoo.com>wrote:

>
>
>
>
> Hi folks,
> My 5245L had faulty nixies and my approach was to use Russian replacements
> available from a Canadian outfit.
> The "snags" are.
> These nixies , though a direct socket fit , have a glass extrusion at the
> back to
> "suck out"  or let in the neon gas during manufacture.
> I drilled the socket ,slow and carefully here, to allow this extrusion to
> fit into the
> socket . There is some room to spare for this on the socket and no
> disassembly of the readout card is needed.
> The second "snag " is that the figure 5 is in fact an inverted (upside
> down) fig 2 but
> in practice it's not a problem.
> BTW never had a problem with any of the "innards" of the counter boards!
> Would be interested in your details of the oscillator board as , like you,
> mine came without the crystal. The oven container was there but empty!
> Have since obtained a crystal in its oven but still not happy with the A26
> board.
> performance AND have run out of Germanium transistors as per on that board.
>
> Just had a thought. Ever since I purchased my 5245L many years ago, I have
> been on this Time nut treadmill . I guess I should have known better at the
> time !!!
> Now with a shack full of HP and Tek gear and the inevitable rubidiums , GPS
> thunderbolts and plain old oxco's , time to call "CQ' is at a premium. (Hi)
> Cheers from OZ
> Arie
> VK3DBF
>
>
> Been troubleshooting a 5248 M someone grabbed teh oscilator and A26 board
> from it.
> The a26 board was replced with 2 cmos chips and 1 transistor.
> Now I am at the counter gate. Darned if I don't have an issue in the
> dreaded
> tunnel diodes area. Such a lucky day for me.
> Need to cleanup and solder in the pseudo a26 board so I can more easily
> work
> on the gate.
>
>
>
>
>
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