Bob
I also think that the applied voltage to the resistor in the anode
circuit has to be lower than the voltage needed for the anode-cathode to
strike itself. If higher then the R-C-tube will act as a relaxtion
oscillator. The voltage must be higher than the voltage that will fire
the anode-cathode gap when the tube when the grid is triggered (which
must be the case now). The capacitor then provides the energy to
operate the solinoid and will discharge to a low voltage and the tube
will self extinguish. So you might compare the voltage with the
datasheet (which I don't have) to check it is below the anode-cathode
firing voltage. And/or disconnect the trigger signal and see if the
tube continues to flash - ie it is acting as a relaxation oscillator and
not being triggered.
I have some Z700U, if you would like a couple PM me with your address.
Grahame
On 16/02/2014 11:25, bob harper wrote:
ok i have checked all the resistors around this tube and replaced all
caps still no good...i have doing a bit of reading cold cathode tubes
my dance and circuit design by neal [free book downloads] and it seems
to me that this circuit would need a pulse to fire and be extinguished
by the 16uf cap charging, but with a permantly live trigger this cycle
would repeat [exactly what its doing] which will not do the tube much
good as the trigger voltage should be removed before the anode voltage
[if i read it right] so i think either the diagram is wrong [unlikely]
or the switching on the jukebox has been altered/bodged i thought
about using the switched live K3 to feed a relay and timing capacitor
to give a pulse to the tube unless there is a way of again using a
capacitor in the trigger circuit to charge up between the trigger and
cathode to give them the same potential while the tube is in the
conducting state.....bob
On Saturday, February 15, 2014 4:35:23 PM UTC, bob harper wrote:
hi Martin thanks for the reply yes I did tie the triggers together
and replaced the 16 if cap will double check all the other
components and check the anode current thanks bob
Sent from my HTC
----- Reply message -----
From: "Dekatron42" <martin.forsb...@gmail.com
<mailto:martin.forsb...@gmail.com>>
To: <neonixie-l@googlegroups.com <mailto:neonixie-l@googlegroups.com>>
Subject: [neonixie-l] Re: trigger tube equivilents
Date: Sat, Feb 15, 2014 12:32
Did you wire both trigger electrodes together, the Z660W have two trigger
electrodes but the ER32 only one.
You must also check that the minimum anode current is 5mA as the Z660W
might otherwise work unreliably in some situation according to the
datasheet.
You might also have to check the capacitor connected to the anode as well
as the anode resistor as those form the circuit that extinguishes the
trigger tube, turning it off, and if they do not work properly the tube
might not be fully extinguished and then it will turn on again - the
capacitor might leaky opr any of the other capacitors/resistors surrounding
this trigger tube might be leaky or having the wrong value.
Also don't forget to replace resistors with types that can handle the
voltage in these circuits, many cheap resistors sold today only tolerate
125V or 250V which won't do in circuits like these!
/Martin
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