Carl1024 Loc: Kaneohe, HI 96744

Volume is giving me trouble as i can hardly hear it when turned on , anyone out there in the electrical field know about vtg stereos?

Orphoto Loc: Oregon

Troubleshooting stereo equipment seems quite off topic

BebuLamar

It's not photography so I think the admin will move it. But first thing first download the user's manual and the service manual here
https://www.hifiengine.com/manual_library/sony/str-7065.shtml

therwol Loc: USA

Does the volume return to normal after moving the volume control knob a few times? Do you hear a scratching sound through the speakers when you turn it? It may just be that the potentiometer in the volume control is going bad, perhaps wearing out or becoming corroded. It may temporarily get better with some contact cleaner sprayed inside, but if it is sealed, you can't really do that. You have to replace it.

Then again, it may be something else. I don't have it in front of me to tell.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

This is a photography section. Does your receiver take digital images? Then be gone with you, be banished to the proper section.

BebuLamar

Good luck getting any good details out of Carl.

BebuLamar

Carl! If you post your question here
https://www.tapeheads.net/forums/receivers-amps-and-preamps-solid-state.22/
You may have better answers.

burkphoto Loc: High Point, NC

Find an electronics repair shop that specializes in the restoration of old receivers. The first things that go usually are things like potentiometers (volume, bass, treble, balance, etc.), switches or buttons, and rotary selectors. The RCA jacks on the back usually get loose and dirty, too. Most of these devices can be cleaned and lubricated with a special spray product from DeOxIt.

Beyond that, CAPACITOR failures are common. When capacitors fail to block DC current, they are said to be "leaky." They are used to block DC power and transmit audio, which is AC. They may physically bulge or leak, too, but by then, they've probably been "electrically leaky" for some time. Electrically leaky capacitors can lead to transformer failures, blown fuses, blown output transistors, etc.

Resistors sometimes drift in value due to heat, which can lead to tonal imbalances and other problems.

Transistors can fail, too, but that is less likely than the problems mentioned above.

A good repair tech will download a circuit diagram, and test voltages throughout a circuit. (S)he will also know what to look for in specific models or model families of equipment, to rule out the most common problems.

I have an old Harman-Kardon 330-B receiver from the early 1970s. It was working very intermittently, and ALL the controls were scratchy and noisy. I opened it up and looked for blown fuses, leaky capacitors, and other issues. After blowing it out thoroughly with compressed air, and vacuuming gently with a brush and crevice tool, I used a spray circuit board cleaner to remove 50 years of hardened dust and filth. After inspecting it again, to see if I could see any burn marks, bulging capacitors, or loose solder joints, I concluded that it was physically okay. Then I used DeOxIt on all the controls, jacks, and switches, and the tuner blades. I let it dry overnight, then put the case on it and powered it up. It was just dirty! It now works perfectly, even at relatively high volume. But at some point, I'll have a pro go through and "re-cap it" — replace capacitors.

BebuLamar

Those old receivers are easy to re-cap. They are all thru hole board with good spacing not like the surface mount stuff they have today.

johnnievegas

What don't you understand about the section title "General Chit Chat"? The only topic prohibited is political.

johnnievegas

What don't you understand about the section title "General Chit Chat"? The only topic prohibited is political.

BBurns Loc: South Bay, California

I am an old Sony bench tech. This is an older analog receiver.
It does not sound like it has a serious electronic failure.
A very common problem on vintage gear is oxidization of the silver coated switch contacts.
My first move would be to cycle every switch and control through all of their positions, 4 or 5 times.
Turn the volume down low. My first guess would be the 'Muting' & the 'Monitor' switch'.

Here is the Service Manual

Good luck.

chrissybabe Loc: New Zealand

Several quotes -
Troubleshooting stereo equipment seems quite off topic
It's not photography so I think the admin will move it.........
This is a photography section. Does your receiver take digital images? Then be gone with you, be banished to the proper section.

What is wrong with you guys ? Are you simply not reading or just basically thick ?
This comes up time and time again and you still simply can't seem to grasp the concept.
This query was posted in "Chit-Chat (non-photography talk)" so is a perfectly acceptable subject.
Leaving aside the fact that the OP would probably get better results elsewhere (although there are some good answers here anyway) I do wish some of you would get on the right page and stop wasting my time having to read extra BS.

BBurns Loc: South Bay, California

BebuLamar

What you don't understand is that the thread was originally posted in the "Main Photography Section" and was moved here after I and Billnikon made our posts.