ZA1000 jukebox diode

[bob harper]

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

[Dekatron42]

You can find interretsing information on these on Ronald Dekkers website here: http://www.dos4ever.com/ring/ring.html - scroll down a bit and you'll se the whole range of the ZA100X series of tubes mentioned, there is also a datasheet  that shows that the cathode is the middle pin and both sides are the anode(s) (they are internally connected to the mesh electrode) - observe that the datasheet only shows ZA1001-ZA1005 but the design should be the same for the ZA1000. You could also email Ronald and ask if he has the datasheet for the ZA1000.

 

The cathodes are connected together with the common ground rail - the bottom wire in the diagram connecting both ZA1000 tubes to each other. The anodes are connected to the figures 14a and 15 respectively.

 

/Martin

[John Rehwinkel]

> 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.

There's some writeup on the ZA100x series here, along with a link to an incomplete (doesn't include ZA1000) datasheet:

http://www.dos4ever.com/ring/ring.html#ZA100X

- John

[bob harper]

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