Pete, You were saying you thought he could whip one of these up real quick. Have you placed your order yet¿
Yamaha B-1 restoration/repair
- Thread starter vintagejapan
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- 2sk180 2sk77 v-fet yamaha b-1
LOL, I have been telling Saint Nick for a whole year, that's what I wanted for Chrismas. I guess I wasn't nice enough and I might endup having to make my own.Nick, can I preorder a couple of the boards for the filter cap mod? They would make nice stocking stuffers for Christmas.
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no and unfortunately they are discontinued. I cannot understand why Panasonic stopped making large uf size cans. They make some of the best PSU caps.
Unfortunately I only have 8 of these, so enough for 2X B-1s. I will need an alternative solution for my 3rd B-1
I have a good stock of Pannies for the B-2s. Placed a good size order just in time before those went away...in case you ever need those, let me know.
Unfortunately I only have 8 of these, so enough for 2X B-1s. I will need an alternative solution for my 3rd B-1
I have a good stock of Pannies for the B-2s. Placed a good size order just in time before those went away...in case you ever need those, let me know.
Woohoo!
I think I just found an alternative solution for the "missing" set. Hint: It starts with four of these:
https://www.digikey.com/products/en...t=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
I think I just found an alternative solution for the "missing" set. Hint: It starts with four of these:
https://www.digikey.com/products/en...t=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
The B-1 I'm listening to right now has 4 CDE 18,000 uF. !00V low ESR caps that are magnitudes better than the dual OEM's. Order those for your other 2 and you won't be disappointed.
View attachment 1052840
Very nice but believe me, there's not a mm to spare in there; I'm pushing the limits with mine but by all means prove me wrong.
...but if they fit, I will have the B-1 singing before Christmas. Pulling that B-1 on the bench tonight
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OK, so it is tight..really tight, but the 51mm would fit. Problem is the height on these things. They have the damn chasis mounting screw on top.
here is how they would theoretically fit..
51mm
50mm
View attachment 1054238
That is as far as I got tonight. I will play with it more in the next couple of days.
BTW, the B-1 from Lane is pretty virgin as far as I could tell...but not anymore
A bunch of dust and lytics on their last mile. The power resistors below really baked this thing up. I have to think of a solution because any other cap would be exposed to the same rising heat from those resistors.
here is how they would theoretically fit..
51mm
50mm
View attachment 1054238
That is as far as I got tonight. I will play with it more in the next couple of days.
BTW, the B-1 from Lane is pretty virgin as far as I could tell...but not anymore
A bunch of dust and lytics on their last mile. The power resistors below really baked this thing up. I have to think of a solution because any other cap would be exposed to the same rising heat from those resistors.
the main caps are still in decent shape based on my El Cheapo tester results.
Capacitance on all four is between 14.25mF-15.1mF
ESR is relatively OK between 0.16ohm -0.24ohm
I will throw these things on the Sencore Z tester in a few days and reform them while at it. They will make a nice fixture to keep around
Capacitance on all four is between 14.25mF-15.1mF
ESR is relatively OK between 0.16ohm -0.24ohm
I will throw these things on the Sencore Z tester in a few days and reform them while at it. They will make a nice fixture to keep around
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I missed your comments on this thread.
If you replace with mpsa42/92, these are operating at their spec limits in PSU board #2. You would be much better off replacing the mpasa all together.
yes, agreed!
also, you might want to stagger the resistors on the other side so they are not lied-up and bake each other to death
vintagejapan
AK Member
Hi Rottalpha, thank you for the tip. What will you replace the mpsa 42/92 with?
2n6520/17 is what I used. Mind the pinout when you order. One of the two has an option for a center collector( japanese style) but not the other. This is messed up. If both did would have been OK, so I used EBC (just like the MPSAs)
here is a link to my quick refresher for my B-1
http://audiokarma.org/forums/index.php?threads/b-1-quickie.800509/
Hello guys,
I found this thread by chance and I wondered if some could help me to find the Tokin 2SK180. I have a Yamaha B1 which is down since several years now with its output devices broken. Is it possible to source two "matched" pairs of 2SK180 within USA ? I am in South America so they have to be sent abroad. Thanks in advance.
Regards,
Claudio.
I found this thread by chance and I wondered if some could help me to find the Tokin 2SK180. I have a Yamaha B1 which is down since several years now with its output devices broken. Is it possible to source two "matched" pairs of 2SK180 within USA ? I am in South America so they have to be sent abroad. Thanks in advance.
Regards,
Claudio.
Hi Claudio and welcome to Audiokarma! Always nice to meet another B-1 owner even if it's not working.
Sadly, due to the recent rediscovery of V-FET's by Nelson Pass and others the 2SK180's are quickly becoming as scarce as 2SK77's ...