I have a Jolida SJ502A, new tubes, a multimeter...now what??

maxwalrath · « **on:** 20 May 2003, 09:02 pm »

I just got a matched quad of EH KT88's, and I need to replace my old tubes. I went to Home Depot and bought a multimeter, and I don't know where to go from here. I've never rolled power tubes before, and I could use some guideance. Thanks!!

Max

JohnR · « **Reply #1 on:** 21 May 2003, 01:32 pm »

Do you have the manual for the amp? That will tell you what reading/s you need to bias the tubes.

A multimeter is a great start though

maxwalrath · « **Reply #2 on:** 21 May 2003, 04:15 pm »

I don't have the manual, but I spoke with someone a Jolida who said it should be set for 50 millivolts. My problem is I have no idea how to measure the tubes or set the bias. I'm at work while Jolida is open, so I can't have them walk me through it.