Effects / Instruction on Pulling Tubes

In general, when you pull 2 tubes (1 from each side of a 100w 4 tube amp) each jack represents more or less twice the impedance that is marked.

That means the following :

  • 4 ohm tap on your amp gets plugged into an 8 ohm cabinet
  • 8 ohm tap on your amp gets plugged into a 16 ohm cabinet
  • 4 ohm tap on your amp gets plugged into 16ohm / 16ohm cab
  • etc.

There are a few benefits with this practice :

  • Save $$ on tubes.
  • Run your amp at 1/2 the power (great for non-master volume heads).
  • Add years to your transformer (there is almost no chance of the transformer overheating in this scenario)
  • Quicker breakup at lower volumes.

So, with two tubes pulled, the 4 ohm tap should run into an 8 ohm cabinet.  If you’re using an attenuator in addition to pulling tubes – you’d run the 4 ohm tap of the amp into the attenuator (e.g., 8 ohm Hot Plate), then into an 8 ohm cabinet.

If you liked this post : check out these YouTube videos :

http://www.youtube.com/watch?v=zdDfNq2Z0sQ – or just click PLAY below to watch it right here !!

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Filed Under: Amps

About the Author: The Tone King | TheToneKing.com | TTKRocks | REAL reviews for REAL players! ROCK hard, ROCK loud, ROCK ON!

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