[Premium-Rx] RACAL RA3721 REPAIR

[Pat1McA at aol.com]

Greetings to All,
 
Can anyone please help by advising me where I can purchase, either new  or 
used, the following VICOR DC/DC Converters as used in the RACAL RA3721  
HF/VHF/UHF Receiver Power Supply.
 
These seem impossible to get here and naturally the UK Agent does not  want 
to know.
 
24 volt out.   TYPE  VICOR  VI -J-73- CZ
 
15 volt out.   TYPE  VICOR  VI -J-72- CY
 
 9 volt out.    TYPE  VICOR  VI -272-  CW
 
 5 volt out.    TYPE  VICOR  VI -J70-  CY
 
The 24 volt one is especially sought.
 
Any help on this is greatly appreciated.
 
Thanks in advance,
 
Pat G3YFK