[time-nuts] HP10544a Technical Info needed

[Dr Bruce Griffiths]

Lester Veenstra M0YCM wrote:
> I have a bad 10544 (received from AST) that I am planning to look into. 
> No 10 MHz out and very low 12 VDC current.
> Has anyone the translation from HP PN to Commercial equiv for the
> semiconductors ?
>     Thanks
>         Les
>
> Lester B Veenstra 
> M0YCM K1YCM  K1YCM/6Y5
>  
> Mail Address:
>  
> Lester Veenstra
> PSC 45 Box 781
> APO AE 09468 
>  
> Telephones:  
>  
> Office      940-6456
> Office      +44-(0)1423-846-385
> Home:       +44-(0)1943-880-963              
> UK Cell     +44-(0)7716-298-224 
>
>   
Lester

A parts conversion list is available at
http://www.hparchive.com/PARTS/300-hpxref.pdf

The part numbers on the circuit schematic are somewhat abbreviated.

54-215 = 1854-0215 = 2N3904.
53-20 = 1853-0020 = 2N3905?? my guess this should work. but stick a 
ferrite bead on the base as this device may oscillate with all 3 
terminals AC grounded.
26-59 = 1826-0059 = ?? some low bias current opamp with external 
frequency compensation LM208??
3-347 = 1853-0347 = MJE700 PNP power Darlington
4-560 = 1854-0560 = MPSA12 NPN small signal darlington
5-10 = 1853-0010 = 2N2646 unijunction transistor
01-535 = 1901-0535 = Silicon RF detector diode probably not Schottky.
02-033 = 1902-0033 = 1N823 6.2V temperature compensated zener reference 
diode.

Bruce