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Anyone Knowledgeable about old Stereo receivers? #2463109
03/08/18 02:53 PM
03/08/18 02:53 PM
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Charlotte, NC
Orange_Crush Offline OP
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...or point me to the right place to ask this question?

The other day I bought a turntable because my daughter wanted to get into vinyl.

Anyway, I hooked it up to my existing stereo receiver that I pulled out of storage (an old Kenwood A-5040) and everything was great until I went to adjust the treble and bass on the receiver. At that point, the sound cut in and out inermittently in both speakers and then it cut out completely.

Everything else seems to work, but I'm not getting any sound out of the speakers.

Does anyone have any idea if this is something that I can fix...or should I just toss the receiver?


1970 Dodge Charger R/T Hemi Orange U-code 4-speed
1971 Jaguar E-Type Series 3 V-12 4-speed 2+2 Signal Red.
Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463116
03/08/18 03:05 PM
03/08/18 03:05 PM
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Houston,Tx.
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Lee446 Offline
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I don't know much, but did you take off the cover and check the output fuses, you might have blown them.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: Lee446] #2463119
03/08/18 03:11 PM
03/08/18 03:11 PM
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Round Lake Beach, Illinoisy
Rhinodart Offline
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You probably have to clean the potentiometers as they gum-up after sitting, used to have to do that on my 1961 Harmon-Kardon receiver everytime I didn't use it for a while. twocents There are a couple of stereo repair facilities in the Charlotte area if you can't figure it out, google is your friend... wave

Last edited by Rhinodart; 03/08/18 03:12 PM.

The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!
Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463120
03/08/18 03:11 PM
03/08/18 03:11 PM
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in a cattle trailer down by th...
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Guitar Jones Offline
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The potentiometers are probably pitted and dirty from being in just one position for an extended amount of time. May have even broken the circuit.


I never learned to count my blessings, I choose instead to live inside my disasters.

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Re: Anyone Knowledgeable about old Stereo receivers? [Re: Guitar Jones] #2463124
03/08/18 03:22 PM
03/08/18 03:22 PM
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The frozen wasteland of Iowa
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tboomer Offline

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I had an old Fender bass amp that made noise. I cleaned the pots with Deoxit. Best stuff out there! Also check your preamp tubes.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463127
03/08/18 03:25 PM
03/08/18 03:25 PM
Joined: Jun 2004
Posts: 2,502
St. Charles, MO
wingman Offline
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Sounds like the potentiometers are dirty. Just like the pots on the dash dimmer switch of an old mopar. They make cleaning spray just for that task--I got mine at radio shack years ago...

Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463129
03/08/18 03:26 PM
03/08/18 03:26 PM
Joined: Feb 2003
Posts: 18,073
Charlotte, NC
Orange_Crush Offline OP
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Thanks guys. Honestly, taking the thing to a stereo repair place would probably cost more than the thing is worth. The A-5040 was a midrange (at best) Kenwood. I'd be money ahead to just buy another one...but there are a few good vids on Youtube about pot cleaning, so I'll give that a shot first.


1970 Dodge Charger R/T Hemi Orange U-code 4-speed
1971 Jaguar E-Type Series 3 V-12 4-speed 2+2 Signal Red.
Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463135
03/08/18 03:46 PM
03/08/18 03:46 PM
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N.E. OHIO, USA
A12 Offline
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Agree with everything that's been said.......disconnect or unplug the speaker leads then spray and turn all of the knobs back and forth min to max quickly several times. You can also use an air nozzle and low air pressure to clean out the rest of the unit and even the potentiometers/controls after using the cleaner to finish the job.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: A12] #2463182
03/08/18 05:14 PM
03/08/18 05:14 PM
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dogdays Offline
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One other thing: Never throw away a Kenwood receiver. They can be sold on ebay in non-working condition and someone will fix it up. The Kenwoods are known for a very solid build. They have very good tuners, too.
I don't understand why old solid state receivers like from the mid '70s have had a resurgence of popularity, but they have. Back in the day the folks more interested in sound went to separates as soon as they could. I know I did!

R.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: dogdays] #2463202
03/08/18 05:56 PM
03/08/18 05:56 PM
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Posts: 37,670
Round Lake Beach, Illinoisy
Rhinodart Offline
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Saw American Pickers the other day and they got a Phase Linear amp just like the one I had when I was young, that thing ROCKED! They paid $285 for the one they bought and I started looking, they are still going for good coin, I might just have to pick another one up! up


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!
Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463212
03/08/18 06:08 PM
03/08/18 06:08 PM
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Posts: 4,500
Virginia
BSharp Offline
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Virginia
Agree it's probably the pots, but something else that can happen is the electrolytic capacitors may dry out and fail. You hear about old equipment getting "recapped".

Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463267
03/08/18 07:12 PM
03/08/18 07:12 PM
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Newberry Springs, CA
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69Mannix Offline
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Everyone into audio is on the lookout for old amps, receivers tuners from late 60's to about early 80's. The new ones do not sound as well as the old ones did. I have a Sansui SM-80 Tube Receiver that was made bout 1959. Was in a garage that the guy was moving. His dad and grandfather lived there too. The vintage tube gear is HOT and on a lot of these older pieces they need to clean the pots, maybe replace capacitors or other parts but they are the best gear made. Would not consider buying new.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: dogdays] #2463303
03/08/18 08:18 PM
03/08/18 08:18 PM
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Posts: 1,822
central texas
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krautrock Offline
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central texas
Originally Posted By dogdays
One other thing: Never throw away a Kenwood receiver. They can be sold on ebay in non-working condition and someone will fix it up. The Kenwoods are known for a very solid build. They have very good tuners, too.
I don't understand why old solid state receivers like from the mid '70s have had a resurgence of popularity, but they have. Back in the day the folks more interested in sound went to separates as soon as they could. I know I did!

R.


I think alot of people think they look cool.

If they are paired with the correct speakers they can sound awesome.
I've been using a Marantz 2220B that I got off craigslist for $75, sold my fancy seperate tube amp and preamp (SET EL84), don't miss them at all.
I do have a very nice tube phono preamp now though.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: krautrock] #2463312
03/08/18 08:40 PM
03/08/18 08:40 PM
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Posts: 4,500
Virginia
BSharp Offline
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Virginia
I have a couple of Marantz pieces I bought new in '79. They need a little attention; pots and caps, I'm sure.

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Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463343
03/08/18 09:32 PM
03/08/18 09:32 PM
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nj
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JAMESDART Offline
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nj
I like the old stuff. I had an old realistic 8 track reciever and speaker combo. When I blew out the speakers I put this sansui quadraphonic and kef speakers in the garage that we used
To have in the house. The sansui weighs a ton. If I didn't know better I'd swear it was loaded with bricks. I had some jbl speakers that I picked out of The trash on a job. They just deteriated a couple weeks ago but I'm replacing the foams. They aren't too expensive but I can't bring myself to throw them out. Those also sounded great with the sansui.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463419
03/08/18 11:09 PM
03/08/18 11:09 PM
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Alabama
BigMoneyLewis Offline
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Alabama
When I clicked on this thread , I thought we were gonna be talking about older receivers . I guess 'old' is a relative term . I think your unit was made around 1992 . I am running an old Kenwood KR 5150 in my bedroom with my dvd player hooked to it so I can watch / listen to movies with my old Pioneer 150 watt speakers and rattle the windows .
This classic is still going strong , I think it was made around 1971 and retailed for about $ 320 then (equal to $ 1,958.46 in todays money).

Greg

kenwoodstereoreceivermodelkr-5150_1.jpg

gregward@mchsi.com phone 256-852-0955
Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463544
03/09/18 02:27 AM
03/09/18 02:27 AM
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Fragged State of Skuldruggery
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srt Offline
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Fragged State of Skuldruggery
Get some CAIG DeOxit (probably have to amazon it).
Sprey and let sit, then spray again and work it back and forth.
I bought a rack of 70's mcintosh and after fighting a couple cut out issues cleaned it up with the stuff and have not looked back.
Still waiting for the capacitore to die. I've still waiting for going on 6 years. If they do then I'll find a shop.

Re: Anyone Knowledgeable about old Stereo receivers? [Re: BigMoneyLewis] #2463625
03/09/18 11:29 AM
03/09/18 11:29 AM
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St. Charles, MO
wingman Offline
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Originally Posted By BigMoneyLewis
When I clicked on this thread , I thought we were gonna be talking about older receivers . I guess 'old' is a relative term .


What'd ya say? I can't hear you sonny!

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Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush] #2463847
03/09/18 04:59 PM
03/09/18 04:59 PM
Joined: Dec 2004
Posts: 2,062
Wheatfield, NY
Cuda340 Offline
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Wheatfield, NY
You can buy Deoxit at any guitar center store. Do all the potentiometers as well as the switches. Exercise them ALOT. As far as caps and such go, try the deoxit first, unless you take the top off and really see some leaking, burnt or bulging components.

You can also get the deoxit faderlube which also lubricates the pots as well as cleans.


Audiokarma is a great forum for audio info...

Last edited by Cuda340; 03/09/18 05:00 PM.

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