Sony TA-F60

[CrazzyAbtTubes]

This unusual stereo was saved from becoming scrap at a TV repair shop, and would like to try and get it working in some form.

It puts out 100 watts per channel and uses a very strange switching power supply.

The amplifier has a blown channel and the outputs are NEC C2681/A1141, have no idea what can be substituted for these but really want to know. If anyone has a schematic that would be very helpful, and if any one has any experience with this amplifier I would like to hear what their opinion is.

[destroyer X]

The 2SC5200 is NPN, so, at the colector (central lead) you will have positive voltage with respect to the ground potential.

The 2SA1943 is the PNP, so, at the colector (central lead) you will have negative voltage with respect to the ground potential.

It is an advantage to substitute with those ones..they have more power dissipation and also works with higher frequencies..also higher gain..all advantage to put those folks into your Sony.

Be happy!

regards,

Carlos

[CrazzyAbtTubes]

So does this mean I can throw in other substitutes like 2SC3280/2SA1301 just to test the amplifier? I have a bunch of transistors I could throw in to test it, TIP35/36, 2SC3182/2SA1265?

If these get it working then I can upgrade to the 2SC5200/2SA1943, but I think the preveous Toshibas would work even though they are obsolete.

[destroyer X]

Do it the way you want, as you know very well what to do.

Interesting that you have asked what to do..you know even what you should not do..also what is modern, what is old.... you also have beliefs, mythic mind and prejudices about parts!

Man...better to teach us in the place to post questions you already know the answer...really crazy.

Good luck.

Find me in Orion... the Galaxy..i am in the 100458873th planet at zone 847577838B

be happy!

Carlos

[CrazzyAbtTubes]

Thank you destroyer X, I guess I know more than I think I do. I guess the name I chose doesn't explain everything, I like to mix both tube and solid state, but I have had more solid state projects blow up on me than tube projects.

I shall see if I get an explosion.... start running if you see a mushroom cloud and a fire ball coming towards you in the distance.

[CrazzyAbtTubes]

I replaced all the burn't resistors on the main board and checked for shorts in all of the transistors, then I resoldered oxidized joints..... now it is time to insert the beasts!

I soldered them in place, prepaired the heatsink with thermal past and mica...... whaaaaaaat!!!!! It doesn't fit!!!? Damn radiator hate-pipe cooling!!!!

All that wasted time and I can't even get this thing back together for a test drive with the outputs that should have been used in the first place!

Now comes the big question I actually don't know the answer to.... should I junk it or try again? There could be dozens of other problems I have not found out yet and wont till I fire the thing up for a smoke test.

Hmmmm, I wonder if I could make my own amplifier, I was thinking about the ESP P3A but this power supply doesn't even look near to being capable of driving a 100watt like Sony says stereo amp.

I was hoping that someone may have a schematic to offer but it looks like I am stuck making my own..... again.

[CrazzyAbtTubes]

After an hour of bending pins and resoldering traces I get the stereo back to gether just to find out that it does nothin! No smoke, no heat, no lights, no voltages what so ever.... and the culprit.... the stupid switching power supply....DEAD!!!!