moondogtn
Well-Known Member
I picked this up last weekend hoping for the best. I paid too much since I was told the unit was working fine. I listened to it briefly and no scratchiness in any controls. All other functions so seemed to work but then, I noticed right channel is louder than the left channel.
I was going to try to dial in adjustments prior to cleaning up just to listen to properly. I was hoping it would clear up balance issue. Left channel which was weaker will allow me to do so but right channel was fluctuating wildly no matter what I try.
I read several threads on here regarding this issue.
I confirmed KVr1 and KVr2 were functional using a meter. I may still replace with better, multi turn pots as they are much easier to adjust.
I ordered the UPA68HA from Steve at cietron via their eBay store. It should be here soon. I’m hoping it’s legit and cietron has been around forever. From what I can tell, they have reliable old parts.
I’m hoping this resolves that issue and to be able to make all adjustments.
I want to repair this unit properly but had a few questions.
After cleaning it up a little, I can see someone else has been in here and done some work. I assume they used what they could find to make the unit functional. Please see pics.
First thing I noticed was the L and R written in marker on the shields. Then, the .33ohm 5 watt resistor piggybacked on original .27 ohm 7 watt emitter(R71)
Then, I see the resistor(R63) that got hot? It does measure good but still will get replaced.
Finally, I notice a transistor (Q64)that is not original. Installed is 2SA1170 that s/b 2SA1216.
As you can see, the unit was pretty dusty. Seller said it belonged to his brother and had been in the closet.
I say this because I don’t think he knew about the work but I am giving him the benefit of the doubt.
My questions would be:
Is the 2sa1170 that is installed a suitable replacement or should I just get the correct 2SA1216. I can find them through BD enterprises or digikey at a quick glance.
The emitter, I can get the proper specifications replacement but it will look different. At least then value would be correct. I don’t want to leave thot other one in there as is.
This is as far as I have gone at this point but wanted to see what thoughts were in the Sansui world from the gurus here. I appreciate and guidance or help. Btw, I can get better pics. Thanks
Note: This is first Sansui I have had the opportunity to work on. I also edited to designate part designations and will add a better picture magnified and highlighted.
Bill
I was going to try to dial in adjustments prior to cleaning up just to listen to properly. I was hoping it would clear up balance issue. Left channel which was weaker will allow me to do so but right channel was fluctuating wildly no matter what I try.
I read several threads on here regarding this issue.
I confirmed KVr1 and KVr2 were functional using a meter. I may still replace with better, multi turn pots as they are much easier to adjust.
I ordered the UPA68HA from Steve at cietron via their eBay store. It should be here soon. I’m hoping it’s legit and cietron has been around forever. From what I can tell, they have reliable old parts.
I’m hoping this resolves that issue and to be able to make all adjustments.
I want to repair this unit properly but had a few questions.
After cleaning it up a little, I can see someone else has been in here and done some work. I assume they used what they could find to make the unit functional. Please see pics.
First thing I noticed was the L and R written in marker on the shields. Then, the .33ohm 5 watt resistor piggybacked on original .27 ohm 7 watt emitter(R71)
Then, I see the resistor(R63) that got hot? It does measure good but still will get replaced.
Finally, I notice a transistor (Q64)that is not original. Installed is 2SA1170 that s/b 2SA1216.
As you can see, the unit was pretty dusty. Seller said it belonged to his brother and had been in the closet.
I say this because I don’t think he knew about the work but I am giving him the benefit of the doubt.
My questions would be:
Is the 2sa1170 that is installed a suitable replacement or should I just get the correct 2SA1216. I can find them through BD enterprises or digikey at a quick glance.
The emitter, I can get the proper specifications replacement but it will look different. At least then value would be correct. I don’t want to leave thot other one in there as is.
This is as far as I have gone at this point but wanted to see what thoughts were in the Sansui world from the gurus here. I appreciate and guidance or help. Btw, I can get better pics. Thanks
Note: This is first Sansui I have had the opportunity to work on. I also edited to designate part designations and will add a better picture magnified and highlighted.
Bill
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