I just bought a used D'lite 22/33 amp that was built from a kit. It came with 6V6 tubes. I want to try it with 6L6's. The Brown Note support is lousy, I can't get any info from e-mail or phone calls. On the BN web site it says there is a toggle switch to switch between 6V6's and 6L6's and then rebias. My amp has no toggle. I see no toggle switch for that on BN layouts on their forum. Can the amp tubes be interchanged with just a bias? Do I have a 22/33 amp or just a 22 watt? Thanks for your help.