Sony TA-F6B Repair And Restoration
This Sony TA-F6B solid state integrated amplifier is in pretty good cosmetic shape but needs some repair and restoration.
When powering up this Sony TA-F6B there is a slight clicking sound but no other indication that the unit is on.
I have removed the top cover of this Sony TA-F6B integrated amplifier to take a closer look.
I have removed the power supply cover. This power supply has a reputation of failing as it runs on the warm side.
The power supply in the Sony TA-F6B is unusual for a solid state vintage amplifier for it's design as well as it producing 300+ volts DC.
The transistor and capacitor shown below failed blowing a piece of the artwork off which I repaired by inserting a wire.
Almost certainly both the transistor and capacitor did not fail at the same time. One component failed and took the other one out with it.
With the artwork repaired along with replacing the defective transistor and capacitor this Sony TA-F6B powered up fine.
The voltages from the power supply measured correctly so now I'll continue with the repair and restoration of this Sony TA-F6B amplifier.
I have removed the faceplate and knobs for cleaning as well as to allow me easier access to the switches and pots.
With the boards removed it's a great time to clean up the chassis. Any vintage repair or restoration involves a lot of cleaning.
With the boards removed it is much easier to properly clean the pots and switches with deoxit.
Deoxit is a great product but it can make a mess if you spray it all over. With the boards removed I can get the spray where I need it.
The Sony TA-F6B has enough slack in the cables so that you can get where you want without to much of an issue.
I wish all the vintage stereo equipment had this much slack in the cables.
This Sony TA-F6B is over 40 years old so I will be replacing all of the old electrolytic capacitors with modern equivalents.
In the audio path I'll be replacing the old smaller value electrolytic capacitors with modern film capacitors for improved audio quality.
Many of the replacement capacitors are smaller in physical size then the originals. In addition the replacements have a higher temperature rating.
The replacement filter capacitors are about half the size of the originals. Notice the 200V rating which is higher then most solid state equipment.
When replacing components you may need to move the assemblies around to get them into a space that's easier to work on.
You must be able to get to the back side of the assemblies of this Sony TA-F6B integrated amplifier so that you can get to the solder points.
I have replaced the old the electrolytic capacitors in the EQ board. With fresh capacitors this Sony TA-F6B can hopefully operate for another 40 years.
This Sony TA-F6B repair and restoration is moving along nicely as the assemblies can be put into positions that make access much easier.
Now I'll continue to replace components on the control assembly. You don't normally have this much slack in the cables.
With the assemblies removed it's a great time to clean out the chassis. Any vintage audio repair or restoration involves a lot of cleaning.
I have replaced the necessary components and it's time to replacement the control assembly back into the chassis.
The control assembly has been reinstalled into the chassis. Next the EQ assembly will be installed above it.
I have reinstalled the EQ assembly. This Sony TA-F6B integrated amplifier repair and restoration is getting closer to completion.
There are several different assemblies in this Sony TA-F6B that need work. Next will be the meter assembly.
Now I'll start the electrolytic capacitor replacement on the power amp assembly during this Sony TA-F6B repair and restoration.
I have tilted the rear panel down on this Sony TA-F6B integrated amplifier to make the removal of the power amp assembly easier.
After removing four screws the power assembly of the Sony TA-F6B can be positioned on it's side.
With the power amp assembly on it's side I access the artwork side so that I can replace those 40 year old capacitors.
The picture below shows how the Sony TA-F6B chassis will peel apart to make any repair or restoration easier.
While the power amplifier assembly is removed I'll reseat the power transistors as well as install new insulators and thermal compound.
Remove two screws from each power transistor and they can be pulled out from the sockets attached to the heatsink.
These are the original power transistors that left Japan 40 years ago. Hopefully they can operate for another 40 years.
Cleaning off the old dried up thermal compound and applying fresh thermal compound will allow the transistors to run cooler.
With the power amplifier assembly work complete on this Sony TA-F6B integrated amplifier I'll reinstall it into the chassis.
The Sony TA-F6B power supply is under a lot of stress so I will replace all of the electrolytic capacitors within the power supply.
The capacitors will be upgraded to 105 degree centigrade rated Nichicon PW series.
I have the capacitors replaced. This Sony TA-F6B repair and restoration is getting closer to completion.
I have reinstalled the power supply and I'll get the other boards installed. I'll give the TA-F6B a final visual check and then it's time for bench testing.
I have reinstalled the assemblies into this Sony TA-F6B. I'll dress the cables neatly and install new tie wraps
I adjusted the DC offset as well as the bias to factory specifications. The Sony TA-F6B service manual has all of the adjustment details
I'll use a signal generator along with a distortion analyzer to test out this Sony TA-F6B integrated amplifier.
This Sony TA-F6B tested out very well on the test bench.
This Sony TA-F6B integrated amplifier repair and restoration is complete. It's time for some music!