I just took out the old stock tubes put new Sylvania EL34 power tubes in my DSL40C (along with 3 new preamp tubes). When I went to bias, the initial reading said 65! Is this uncommon? I of course biased down to 38. I checked my multimeter and was on DCV 200m and all that. The amp is still on my bench, so before I put it all back together, just wanted to make sure about this. I do have another DSL40C with stock tubes, but don't want to take that apart to check right now. Thanks for all your help!