Finally I have my KT-88 build done, unfortunately the matched pair I purchased from CE Distributing were a little too unmatched, only a slight 40ma
discrepancy! I put a spare pair in from Mojo, .4ma out, in the ballpark I'd say.
My question is: Do I need screen resistors running the KT's UL? I have a DPDT switch installed to switch between pentode and UL mode. I'm running
1K screen resistors right now for both classes of operation, plate volts around
590 to 600, screen volts trail by 1 volt. I'm biased at 46ma for about 26-27
watts dissipation. If I move the screen resistors to the pentode side only, the screens may run higher than the plates in UL, posssibly over the 600V limit. Is this a problem? Thanks.
discrepancy! I put a spare pair in from Mojo, .4ma out, in the ballpark I'd say.
My question is: Do I need screen resistors running the KT's UL? I have a DPDT switch installed to switch between pentode and UL mode. I'm running
1K screen resistors right now for both classes of operation, plate volts around
590 to 600, screen volts trail by 1 volt. I'm biased at 46ma for about 26-27
watts dissipation. If I move the screen resistors to the pentode side only, the screens may run higher than the plates in UL, posssibly over the 600V limit. Is this a problem? Thanks.
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