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Hello to all,
I have encountered a strange pinout diagram on the 6AH4:
Since pin 3 is unconnected, i use the socket tag corresponding to this pin as a convenient anchor for point-to-point wiring.
But what about pins 4 and 6, are they not connected as well? If so, why is it not represented like pin 3? I have checked other datasheets and they are similarly represented.
Can i use the socket tags of those pins as wiring anchors just like i did with pin 3 or should i leave them alone? I currently use them for that purpose on my breadboard for B+ distribution and the circuit hums as hell... Maybe because the pins are internally connected to who-knows-what? But usually an internal connection is explicitly mentioned on the datasheet ...
And what are those "internal connections" for, anyways? Is it to act as a form of switch like in gas regulator tubes? Surely not always the case, as for example on the 5687 there are two pins labelled "internal connection - do not use". Then why make them externally accessible at all?
I am a bit confused...
Thanks in advance for any info.
Joris
Follow Ups:
According to the diagram the 6AH4 is a 6 pin tube. 5 are used.
Sometimes Octal tubes are made with all 8 pins present even though the original had less.
I'm not sure why you circuit would hum assuming pin 3 is not connected.
Check it with an ohm meter.
As for the 5687, that must be a typo. The 5687 has 9 pins and they are all used and none are tied directly together.
Tre'
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