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#2463109 - 03/08/18 11:53 AM Anyone Knowledgeable about old Stereo receivers?
Orange_Crush Offline
Belieber!

Registered: 02/03/03
Posts: 17955
Loc: Charlotte, NC
...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?
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#2463116 - 03/08/18 12:05 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
Lee446 Offline
super stock

Registered: 01/20/03
Posts: 1137
Loc: Houston,Tx.
I don't know much, but did you take off the cover and check the output fuses, you might have blown them.

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#2463119 - 03/08/18 12:11 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Lee446]
Rhinodart Offline
Rhinotruck

Registered: 01/20/03
Posts: 36642
Loc: Round Lake Beach, Illinoisy
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


Edited by Rhinodart (03/08/18 12:12 PM)
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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!

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#2463120 - 03/08/18 12:11 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
Guitar Jones Offline
master

Registered: 12/18/09
Posts: 9863
Loc: in a cattle trailer down by th...
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.
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#2463124 - 03/08/18 12:22 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Guitar Jones]
tboomer Offline



Registered: 01/20/03
Posts: 21965
Loc: The frozen wasteland of Iowa
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.

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#2463127 - 03/08/18 12:25 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
wingman Offline
Uncreative Title

Registered: 06/23/04
Posts: 2290
Loc: St. Charles, MO
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...

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#2463129 - 03/08/18 12:26 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
Orange_Crush Offline
Belieber!

Registered: 02/03/03
Posts: 17955
Loc: Charlotte, NC
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.
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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.

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#2463135 - 03/08/18 12:46 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
A12 Offline
I Live Here

Registered: 01/20/03
Posts: 17941
Loc: N.E. OHIO, USA
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.

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#2463182 - 03/08/18 02:14 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: A12]
dogdays Offline
I Live Here

Registered: 01/20/03
Posts: 16209
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.

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#2463202 - 03/08/18 02:56 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: dogdays]
Rhinodart Offline
Rhinotruck

Registered: 01/20/03
Posts: 36642
Loc: Round Lake Beach, Illinoisy
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!

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#2463212 - 03/08/18 03:08 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
BSharp Offline
master

Registered: 01/20/03
Posts: 4439
Loc: 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".

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#2463267 - 03/08/18 04:12 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
69Mannix Offline
pro stock

Registered: 01/25/03
Posts: 1206
Loc: Newberry Springs, CA
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.

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#2463303 - 03/08/18 05:18 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: dogdays]
krautrock Offline
top fuel

Registered: 01/27/03
Posts: 1750
Loc: 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.

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#2463312 - 03/08/18 05:40 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: krautrock]
BSharp Offline
master

Registered: 01/20/03
Posts: 4439
Loc: 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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#2463343 - 03/08/18 06:32 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
JAMESDART Offline
mopar

Registered: 07/03/06
Posts: 467
Loc: 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.

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#2463419 - 03/08/18 08:09 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
BigMoneyLewis Offline
master

Registered: 08/17/04
Posts: 4100
Loc: 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


Attachments
kenwoodstereoreceivermodelkr-5150_1.jpg


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#2463544 - 03/08/18 11:27 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
srt Offline


Registered: 01/19/03
Posts: 8900
Loc: Fire and Fury
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.

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#2463625 - 03/09/18 08:29 AM Re: Anyone Knowledgeable about old Stereo receivers? [Re: BigMoneyLewis]
wingman Offline
Uncreative Title

Registered: 06/23/04
Posts: 2290
Loc: St. Charles, MO
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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#2463847 - 03/09/18 01:59 PM Re: Anyone Knowledgeable about old Stereo receivers? [Re: Orange_Crush]
Cuda340 Offline


Registered: 12/09/04
Posts: 2021
Loc: 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...


Edited by Cuda340 (03/09/18 02:00 PM)

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