[time-nuts] HP 5061A vs. FTS 4050 performance?

[John Ackermann N8UR]

I think the (retrofitted FTS) tube in my nice, later production, 5061A 
Cs died.  I have an FTS-4000 unit with a power supply problem, but with 
a working tube.  I believe the FTS-4000 is the guts of the older FTS 
standards like the 4050.

I'm wondering whether I'd end up with better performance putting the 
good tube into the 5061A, or keeping it in the FTS-4000 and fixing the 
power supply.

Any thoughts?

John