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It's common practice to use a chassis as ground for AC-powered heaters in a tube radio and share that chassis ground for the DC and signal circuits. This depends on the signal level found in that circuit. A mike amplifier needs high sensitivity to very-weak signal voltages. The heater connection for that one tube will sometimes have its own ground wire to prevent "hum" from leaking into the circuit. But a circuit with higher signal levels passing through it won't need that, and can share a chassis ground connection with the DC circuits without causing problems.

I think that's what you're asking about.

73

[QUOTE="nomadradio, post: 792266, member: 22"] It's common practice to use a chassis as ground for AC-powered heaters in a tube radio and share that chassis ground for the DC and signal circuits. This depends on the signal level found in that circuit. A mike amplifier needs high sensitivity to very-weak signal voltages. The heater connection for that one tube will sometimes have its own ground wire to prevent "hum" from leaking into the circuit. But a circuit with higher signal levels passing through it won't need that, and can share a chassis ground connection with the DC circuits without causing problems. I think that's what you're asking about. 73 [/QUOTE]

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