Verellen Octal
- By agedhorse
- Amps and Cabs [BG]
- 269 Replies
This is a good example of why the assumption that a 12AX7 “ALWAYS” has more “GAIN” can be so incorrect.I changed the LTPI valve to a 12AT7 and got 320W.
The reported power depends to the accordingly THD. At 10% you may get 280-320W, at 20% more. If you don't know the THD at reported power it isn't really comparable.
In this context, I noticed that my measurements weren't always at a specific THD level either; from now on, I'll only measure at 10%.
There is voltage gain and current gain, combined they make power gain. When the load requires more current than the tube can deliver, the apparent voltage gain can fall like a rock.