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Finally! The 1060 with the right channel volume lower than the left is back up and running! Sounding sweet, begging to be put back together!

It all started here:http://www.audiokarma.org/forums/showthread.php?t=234043&highlight=1060

And the saga continued here:http://www.audiokarma.org/forums/showthread.php?t=235938&highlight=1060

To sum it all up, I had a stock, original caps, 1060 that all of sudden one day, the right channel was about 75% lower in volume in the left. After multiple tips and advice here, and voltage checks, component swapping from left to right, etc. the fix was a recap of the amp board.

Funny thing is, the problem was with the right channel, but the fix was with the left channel caps:scratch2:

I replaced the right side caps last week and no change in the problem, well this evening I replaced the left side caps c-718, c-708, c-710, and c-704. That took care of the problem. Why it affected the right side sound, I don't know. Anybody have an explanation? All I know is it is up and running again.

The amp board is recapped, and now I have to remove the umbilical cord that was installed temporarily in order to have the amp board accessible for diagnosis/repair and still be in circuit. I will install the original output transistors, and put the amp section back into the chassis. I still have to recap the preamp board, phono board, and the 3 large caps, but, life is good again. I think the hard part is over (knock on wood) for now.

For those of you who have vintage gear that has not been recapped, do so! Do so now! Save yourself allot of aggravation! Your playing Russian roulette. I did not have this unit all that long, and planned on a recap, but I waited too long!

Thanks to all for their help and suggestions. Could not have done it without your advice and expertise. Great group of folks here! Now I gotta go listen to some more music!:music: YD

Congrats! Now you can enjoy that amp even more, take pride that you fixed it yourself. I think I need to hear a 1060, they get lots of love here on AK.

Are you sure no one swapped connections or anything? It took me some time to figure out that the right channel was the top row and the left channel was the bottom row on the RCA connectors.

Yankee Dog, Congrats. I picked up a 1060 a few months ago, and it had to be recapped for similar reasons--though I didn't have the mojo or skills to do it myself.

Enjoy the tunes and your accomplishment! At least for my set-up, a rehabbed 1060 made me stop searching for other amps; what a precise, yet still warm sound.

Yankee Dog, Congrats! I know you had hard time with this amp.

When you will recap the preamp section, replace the 2SC458 and 2SC1000 transistors by 2SC2240BL

By the way, in the amp board schematic, the diodes H717 and H719 should be reversed.

Congrats on getting you 1060 back up and running!

Enjoy the music!

Thanks again guys. As far as the preamp board, I replaced the 2sc1000 with some 2SC1815 I had left over from an earlier project.

I don't have any 2sc458 on the preamp board. I think I do on the phono board, but not the preamp board. The manual says I should have some 2sa493 on the preamp board, but I have some strange looking black transistor with a rounded dome type top to them, I can't make out any numbers other than "702ej" on the side of them. Not sure what they are?

Not sure what those trannys are called and whether I should replace them or not. They are at locations h403, 404, 407,408, 415, 416. I thought I had seen pics of another unit here with the same trannies, but can't seem to find them now. Will look again and post a pic or a link when or if I find it.

As far as h717 and h719, I did swap those from left to right, but, kept them in the original positions by making notes on their positions before removing them, so it looks like I got lucky on that one.

The unit is back together, and I played it for about 4 hours last eve. All seems well, adjustments have been made and are in spec. I just received a new Sony XDR-F1HD Tuner yesterday as well, so I have that running into my 1060. Seems like a nice combo. YD

I remember your earlier thread(s) about this amp. Very happy to hear you got it all sorted out, and the sound is back to normal. :music: :thmbsp:

It DOES pay to recap these old units, for the reasons you've stated. A good reminder for anyone who has old gear they haven't done this with, yet.

Funny thing is, the problem was with the right channel, but the fix was with the left channel caps:scratch2:

I replaced the right side caps last week and no change in the problem, well this evening I replaced the left side caps c-718, c-708, c-710, and c-704. That took care of the problem. Why it affected the right side sound, I don't know. Anybody have an explanation? All I know is it is up and running again.

YD

Well, We ALL assumed the problem was in the right channel because the right channel was weaker than the left channel, but it is clear now that the problem was in the left channel because the left channel was stronger than the right channel.

The problem was C710. This cap dried and his capacitance was much lower than expected (47uF). The consequence of this was a higher impedance, particularly at low frequencies, in the feedback branch, between the output of the amp and the emitter of H702. The closed loop gain was higher than expected in the left channel.

This is my explanation, and it is coherent with your observations (stronger output and more bass on the left channel)

Excellent explanation, and while I could never articulate it as well as you. I thought that maybe something like that was going on! Thanks for explaning it. It makes lots of sense to me YD

Recap is done, all except the 3 large main caps. Have to order some new holding brackets to fit the newer smaller caps. Otherwise, it is sounding nice. A little "boomy" right now, but I have noticed that with other recent recaps as well. The "boominess" is easily corrected with the bass adjustment, and only seems to last about a month before it goes away (burn in of the caps?).

Just need to swap out a few more transistors on the phono board, and then it's time to put the faceplate, knobs, and panels back on.

Not going to mod this unit untill winter, but will start to gather the components for the mods. Man, I really enjoy listening to this thing. YD

My 1060 got cleaner and less boomy after recapping the phono and tone boards. Maybe that'll change when I recap the amp. I've also replaced the trannys too as well as the mylar caps. Basically I will be redoing everything except the resistors, diodes, and ceramic caps.

I noticed mine got "cleaner" changing out the tone board transistors. I could word the "boominess" another way: Less need for bass. That is with some Bose 201 shelf speakers with 6 inch woofers, so, no problem in the bass department. Had to back it down.

I use Nichicon UKT audio grade caps in everything except the power supply. For that I use Nichicon UPW caps. Good price, good selection, 105 degree.

My findings seem consistant with my 2220 and my Nikko receiver. We shall see on my Pioneer, that one is next on the recapp list. YD

Nothing left to do but the large main caps. Otherwise, recap and transistor swap out is done. I also swapped out the 2 tantalums on the phono board for electrolytics.

Just a side note: It is amazing how many descrepencies I have found in the manual versus what is actually installed on the various circuit boards of this 1060 YD