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Post by ebagjones on Sept 21, 2018 5:23:04 GMT -7
Hello! I have a Kt-45. Yesterday the it blew about three fuses in a row on standby. I popped a fourth fuse in and pulled the power tubes and the rectifier tube lit up bright and popped a fuse again so I’m guessing that’s the problem. Thing is, I prefer a tighter cleaner feel so I figured this was as good an opportunity as any to switch to solid state rectification. I’ve never done that though, and I know it increases voltage, is it a plug and play proposition or will I have to do anything else to it?
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Post by Chilly Gibbons (Todd T.) on Sept 21, 2018 5:35:42 GMT -7
Would be fine. Below is from the Dr Z website.
KT 45 V1: NOS EF86, V2: Sovtek 12AX7LPS, V3/4: JJ E34L (matched pair), V5 Solid State plug in or Sovtek 5AR4 Recommended Bias Point: 34mA
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Post by ebagjones on Sept 21, 2018 5:58:53 GMT -7
Great thanks - so I can just plug and play?
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Post by doctorice on Sept 21, 2018 6:32:05 GMT -7
Great thanks - so I can just plug and play? You probably will need to check the bias, just to be safe.
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Post by headshrinker (Marc) on Sept 21, 2018 7:29:07 GMT -7
I'd take the probably out of Mike's statement above and change it to you do need to check the bias. It will likely go up a bit with the solid state. May still be in an acceptable range for the output tubes if it was set to 34mamps before, but if it was set high before, it could end up too high. Actually, in my opinion, if you put in a new 5AR4 it should be checked too.
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Post by Chilly Gibbons (Todd T.) on Sept 21, 2018 7:39:22 GMT -7
Check you bias current afterwards. Shouldn't be far off after switching to SS if it was close to begin with. The 5AR4 only drops about 10V.
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