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New-to-me Sony STR-6055

Mortega64

Mortega64

New Member
Hey all,

Just picked up a Sony STR-6055 receiver, this is the first piece of vintage Sony gear I have ever purchased.

A few questions:

It has a special AC cord plug, will a modern PC cord fit this? Looks like one would, but I don't have one to compare.

Also, are there any known problems with this receiver? I plan on testing the PSU filter caps, and then let it warm up slowly over a few hours and see what it does.

Thanks.
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My favorite. My original from 1971 is in use every day as my main amplification. Never been worked on - have to leave it on 24/7 or it makes funny sounds. Knobs and switches have been Deoxitized. Make sure you have the loudness button in the ON position. Good luck. :)
 
Mortega64 said:
Just picked up a Sony STR-6055 receiver, this is the first piece of vintage Sony gear I have ever purchased
Click to expand...

Nice find, i'm sure it won't be your last, early Sony's are very nice and underappreciated by many IMHO. As NAD80 said the power lead is a standard IEC type (kettle cord).
Good idea to check filter caps, also check power supply unregulated and regulated voltages, check DC offset and BIAS.
 
Interesting. I've had a couple 6055's come thru here, but all had captive cords, not IEC sockets. I like the IEC option better.
 
I've noticed this same feature on the Sony STR-V6. Some came with a power cord and some came with an IEC socket. Usually the version with the IEC socket also has a input voltage selector switch of some sort. Probably was an international model.

So make sure the voltage is set correctly before you plug it in and turn it on.
 
Thanks guys, I will go order one of those IEC plugs and go from there.

It would make sense if it was an international model so you could change plug type, it has 4 different voltage settings (100v-117v-220v-240v), currently set to 117v.

Anybody have a schematic for this unit?
 
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TPettenati said:
Usually the version with the IEC socket also has a input voltage selector switch of some sort. Probably was an international model.
Click to expand...

I think TPettenati has hit the nail on the head, some countries at the time would have required a 3 pin power lead with an earth return (connected to chassis) and other countries didn't.

I am not sure if the schematic is part of the service manual here https://www.hifiengine.com/manual_library/sony/str-6055.shtml but is should be.
 
I've seen the IEC cord pretty often, though never on a 6055, usually on International models. Theres a way to tell from the serial number but I cant remember at the moment whether its a 4, 5 or 6.

The STR-6055 is one of my favorites as well. It seems to be unusually robust.
 
Got the receiver all cleaned up and playing, finally.

The inside was dirty and had hay/grass clippings inside!

I checked the PSU electrolytic caps and they seemed okay, plugged it in and nothing....dead.

Spent a while looking for the fuse....found it hiding under one of the circuit boards.

The way Sony installed the fuse on this unit is the dumbest/cheapest thing I have seen in a vintage amplifier.

It was soldered in too....

Installed a fuse holder so I can easily access and change the fuse in the future.

Below are some pics for those interested:

IMG_0388[1].JPG IMG_0391[2].JPG IMG_0392[1].JPG IMG_0393[1].JPG IMG_0397[1].JPG IMG_0399[1].JPG
 
Listening to a recapped 6055 right now. Those old caps may be good, but new ones sound better (well, at least if they are Elna Silmic IIs).

Congratulations on getting it running!
 
Early Sonys were a rats nest inside, but still managed great sound and reliability
 
Soldered in fuses? a new one on me...
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IMO the few Sony's I've had and couple worked on for customer simple fixes. I could write a 'sh*t list a couple of pages long. Can't understand why a company that can reproduce sound very well and many models with huge transformers and very low THD etc... install cheap or minimum service parts.
 
The fuse on the 6065 is worse. Soldered in where the power comes in at the accessory outlets.

Rob
 
The amp has a real nice sound, I would almost compare it to my HK 730 in sound clarity/balance.

It definitely needs to be re-capped, the left channel has substantially less bass than the right and the lows get muddy real fast.

The receiver is a nice surprise coming from Sony, it will definitely be on the bench this winter along side my Sherwood s5000.
 
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