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
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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