You can get a momentary switch that has two contacts.
The switch is not itself directing the signal path through...
I'm lucky it's just in the last 18 months my eyes have stopped focusing quite as close as they uses to, thankfully it's not been a problem when reading or in everyday life, just SMD soldering and drilling small holes.
I did learn quickly yesterday not to look around the room while wearing the...
I started drilling, gave up, got in the car and drove to a supermarket where I bought some reading glasses, came back and was able to see what I was drilling!
I feel it is down hill from here :oops:
As a side note, any etchers here?
If I've understood you correctly 4, 5 and 9 are all connected together?
If so this is wrong, your 6v to pins 4&5 is correct.
Pin 9 will need to be connected to somewhere else, I'm guessing ground. But sometimes filament heaters come off a transformer winding with a center tap, and it's the...
You say you have 6V on the heater filaments, I just want to check that the 6v is between pins 4 and 9, in your diagram you only have a conection going to pin 9 there is nothing connected to pins 4&5, i.e. nothing to complete the circuit.