Quote Originally Posted by lurcher View Post
I have been trying to second guess the effect of using a 88 instead of a 82. As Ali says the anode voltage will be too high, so anode current will be high, but if its cathode bias as it probably will be in a phono then it should be ok. In fact the 82 may well be a cathode follower so that should not to be too bad. But the only way I can see the valve heater lighting up for both valves is if the 82 used 12v heaters (between pin 4 and 5), so the 88 will have been running with 12v on its heaters, which would explain why it was hot. Hopefully the heater supply will current limit so its getting a bit less than the full 12v.

Hopefully if there is any casualty, it will be the 88.
In hindsight, the sound did become "cleaner" when I used the 88; however that was it.... it didn't get any better, not actually more "clearer" or "transparent" to the recording... let alone more musical...