thanks for the very helpful replies....as always on the internet, its 
knowing where to look! think i'll be o.k now.....bob

On Wednesday, July 3, 2013 3:15:17 PM UTC+1, bob harper wrote:
>
> thanks to all the help so far i have ordered and have started to refurbish 
> the PCB and have ordered the parts to remake the power supply as original, 
> using the OA2 valves.
> i have a question regarding this diode, the other trigger tubes came with 
> data or coloured fly leads but these mullard ZA1000 come with 
> nothing....the 2 original ones use only 2 of the 3 leads the other one 
> being chopped off...so i need to know which lead to chop off and which way 
> round to connect the remaining 2...i cant see any markings on them apart 
> from i think, a black spot next to one lead  i have included a photo and 
> the part of the schematic....number 15 ZA1000 is used as a indicator for 
> "select" on the jukebox. thanks, bob
>

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