Tube Matching 101

Tube Matching 101

There is a lot of confusion about matching tubes. It starts with some vendors, especially on eBay, matching tubes by the way they look (visual matching) to matching on multiple electrical parameters at the same time.

There are 4 parameters that could be used to match preamp tubes:

  1. Transconductance – Gm
  2. Voltage Gain – Mu
  3. Plate Current – Ip
  4. Tube Age
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