Distorting reverb tube

[K O'Connor]

Hi Tomislaw

You should measure Vk and calculate the dissipation for the tube to make sure it is within its limits. 12AU7 is 5.5W total for both plate, which happens to be the sum of the individual plate ratings ; 12AT7 is listed simply as 2.5W per plate.

Maybe you should try reducing the dry path signal levela bit, so the driver can be either tube and be stable while providing the reverb depth you want?

Have fun