[time-nuts] HP 5245L Question

[arie schellaars]

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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