nashou
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Tech in Training.....
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Post by nashou on Nov 14, 2016 23:05:57 GMT -5
Should I try the SK146 in the TR107 spot now Or wait ?
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Post by mastertech on Nov 14, 2016 23:15:57 GMT -5
Matching them is not important for now. We are more concerned about how the channel reacts with them installed and hope the problem is resolved.
As far as the voltages matching now, well this is the first time we tested this way. Each part seems to affect the voltages. And each part is required to balance the + and - line voltages. Everything is artfully placed to achieve a balance of 1 voltage against the other.
We also don't know for sure if the phono selector switch was causing an issue. That alone could of been the problem for blowing that TR107. And since that FET is tied directly to that phono selector switch I would not recommend changing it with the unit powered up. I would shut it down for a minute before changing that selector. FET's are very sensitive and a spike when changing that selector could cause a failure.
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Post by mastertech on Nov 14, 2016 23:17:21 GMT -5
Should I try the SK146 in the TR107 spot now Or wait ? Hahaha. that is for you to decide. How much did 1 of those cost you? |
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nashou
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Tech in Training.....
Posts: 1,239
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Post by nashou on Nov 14, 2016 23:19:57 GMT -5
Should I try the SK146 in the TR107 spot now Or wait ? Hahaha. that is for you to decide. How much did 1 of those cost you? two parts were 35 shipped !! yeah I'll wait. Makes sense about the switching of the phono load selector. I should maybe take it apart and clean the contacts. Nashou |
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Post by mastertech on Nov 14, 2016 23:27:14 GMT -5
I'd wait for now on cleaning it since we have good voltages. Off to sleep.  |
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 15:52:58 GMT -5
Ok I just tracked my parts and they say they are delivered. So I'll check the voltages one more time and then should I install all 4 new parts so they are the same and to see if it works before I use the original 2sk146?
Nashou
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Post by mastertech on Nov 16, 2016 16:11:07 GMT -5
yes
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 19:05:46 GMT -5
Ok, I think the parts are ok b it the voltage for the -B is still only -10 the voltage on the gate of TR107 that goes to TR105 is -1.2 and climbs as I leave the probe measuring
I stopped measuring around -1.456 .
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Post by mastertech on Nov 16, 2016 19:50:29 GMT -5
Are the voltages around Tr108 all normal?
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 19:55:52 GMT -5
Yes
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Post by mastertech on Nov 16, 2016 19:57:56 GMT -5
What is the main B- voltage? Is it -10v?
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 20:05:06 GMT -5
Yes it is.
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Post by mastertech on Nov 16, 2016 20:36:47 GMT -5
Is Tr107 still ok or did it blow?
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 20:43:06 GMT -5
It seems fine , I did a diode test in circuit and it measured the same as all other ones. + on G and S and D both measured .633 on all 4 units.
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Post by mastertech on Nov 16, 2016 20:50:07 GMT -5
Ok, good. I want you to remove the following components and test the B- after removal and just test long enough to see if the B- comes up to normal so hopefully we wont blow 107.
Start with R125 and R137 and let me know if voltage comes up.
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