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Roughly speaking, resistance.

Transconductance refers to the reciprocal of the amplifying device's internal resistance. The concept is particularly useful if the device is a voltage-controlled current source (tube or FET). In vacuum tube amplifiers, transconductance (Gm) is (u / Rp), where...

u is the amplification factor. u= (Gm x Rp).

Rp is the anode (drain) resistance. Rp is the internal resistance of the amplifying device.

Gfs is synonymous with Gm.

The reciprocal of Gm (or Gfs) is (Rp / u). Another term for this reciprocal is transresistance.

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