Effects / Instruction on Pulling Tubes
The Tone King | Sep 05, 2009 | Comments 2
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.
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Hi Tone King!!
My question is regarding the THD hot plate. Im a intermediate guitar player and totally new to tube amp, so my question is can i invest in a 50W krank or randall with 2 112 speakers cabs for jamming with my band and use the amp with the hot plate for bedroom practice without having to invest in a solid state which im not a big fan of. Will the THD bring the volume down to bedroom level without killing the tone. If not how about a 20W tube amp.
so.. if I pull 2 tubes out? will there be Negetive things ?