Stinkpot75
New Member
When I try to measure the bias current with dmm across the fuse holder it stays in protection mode. Put the fuse back in and it comes on. Something wrong with my dmm? I have it set to read mA.
Sansui 8080 bias question
- Thread starter Stinkpot75
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And let me add that as soon as you've finished measuring current, make it a habit to immediately put the positive probe back in the voltage port. Otherwise you'll likely forget and use the meter in current mode for measuring voltage, thus blowing the meter fuse and likely whatever it is that you're trying to measure the voltage of...
Also, you may already have blown the meter fuse.
yes indeed.
yes indeed.
Stinkpot75
New Member
Thanks guys. The DMM fuse was blown. When measuring across F07 it won't go above 16.5 mA, F08 is nice and stable at 30mA. Upon inspecting the fuse resistors on 2436, R39 is bad. What's a good replacement for these fuse resistors? Think I remember seeing metal film resistors work.
Just use good metal film resistors, any brand would be an improvement over keeping the fuse resistors. DigiKey and Mouser carry a great selection of them.
Stinkpot75
New Member
Stinkpot75
New Member
Originals are 10 ohm 1/4 watt. I think I might re-cap the equalizer board too. I remember the phono had a thumping, helicopter like sound.
Might as well do it as long as you have it open. You should do the phono board as well. Here's a thread on 8080 phono you may want to read.
http://audiokarma.org/forums/index.php?threads/sansui-8080-restoration.502246/
http://audiokarma.org/forums/index.php?threads/sansui-8080-restoration.502246/
Stinkpot75
New Member
I'm making a capacitor list for the power supply board F-2546 too. What should I use for the 4.7uf 80v bi-polar C11-14?
RR--
Active Member
Hey. I recently restored an 8080 also so my progress thread might be some help. In the thread there's a few parts lists and mods that might be handy.
http://audiokarma.org/forums/index....-sansui-8080-recap-advice-appreciated.817394/
Good luck, it's a sweet amplifier for sure.
http://audiokarma.org/forums/index....-sansui-8080-recap-advice-appreciated.817394/
Good luck, it's a sweet amplifier for sure.
Stinkpot75
New Member
Thanks. I must have an older PDF of that 9090 recap list from here http://audiokarma.org/forums/index.php?threads/9090-recap-list.798507/#post-11065033 That list shows UPW2A4R7MDD for C11-14 on F2546, which are polarized. That's why I ended up asking here.
Stinkpot75
New Member
Another question on this list is about C03 on 2546, 100uf 16v. Why this type here? https://www.mouser.com/ProductDetai...GAEpiMZZMsIwzbKW1rlgQwAj9weGF3mmAYu1Zoh%2bmk=
tnsilver
Stereo Puppy
true. I updated it b/c the mistake with the polar caps was noted by more than one AK'er already.
Is this one of mine? I have no recollection of ever using it...
EDIT: yup, apparently it's in my list. I still can't explain why a poly type.
It was quite some years ago since I've made that list. It's possible I didn't find the exact voltage with a regular aluminum electrolytic.
I'll check what's in my 9090 for C-03 tonight. I'm quite sure it's a Nichicon or Elna electrolytic.
Stinkpot75
New Member
This is what I've got in my cart @ mouser for C03 https://www.mouser.com/ProductDetail/647-UPW1C101MED1TD
Stinkpot75
New Member
While I'm at it...C04 (47uf 50v) on the list is obsolete and n/a at mouser. Should I go with a UPW or UTT there instead? I'm unsure of what series is ideal. Price is no issue I'm not buying bulk.
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