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Loud HUM from 1963 Wurlitzer 2710 when plugged in

I recently purchased a 1963 Wurlitzer 2710. When the unit is plugged in a loud Hum emits from the speakers. When I opened the back I observed one of the tubes lit up. It intermittently blinks a white/bright blue light. When the light goes on and off the Hum changes from loud, to not quite as loud. The volume control doesn't change anything. A record will play but no sound from the speakers

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  • 34,148 Answers

If you observed a vacuum tube with the symptoms you describe, it requires replacement but there may be other failed components as well.

Posted on Dec 27, 2013

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Posted on Jan 02, 2017

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SOURCE: Philips CDR775

Bad earth / failed capacitor on the PSU board. I sell replacements via ebay or can email a service manual for you to get fixed locally. Fluffcat1

Posted on Jan 28, 2008

  • 1 Answer

SOURCE: Hum when attached to an external amp.

The simple soloution is to buy a "buzzstop" .Its a box with an input and output and eliminates hums, I bought it from a company in Ireland www.bluered.ie or you could try powering the jukebox and the amplifier from the same socket to see if its an earth hum

Posted on Feb 24, 2009

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Uniden#tru94852 has a loud hum & we can't


Loud hum is usually foreign earth which could be water in telecommunications pits or other problem in exchange. To prove if phone or line is faulty-plug in another phone. If you have more than 1 phone in your property you would want to unplug them also and test from 1st socket.

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Sounds like the hum might be mains hum caused by the failure of the power supply capacitor(s) in the sub. It/they will be the largest on the pc board. You will find all the details (needed to replace it) on them. If you find more than one replace both.

Dec 10, 2009 | Audio Players & Recorders

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Very loud hummimg and crackling - even when volume turned down.


There are a few variants for this model depending upon the serial number. From your description, there are some capacitors in between the amp stages called coupling caps that are failing. The hum is some DC current being passed through the output stage. The crackling is probably just dirty controls.

Dan

Aug 18, 2009 | NAD Audio Players & Recorders

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Earth hum


You need an earthing isolation unit. I'm not sure how it works but that's what you need.

Dave F.

Jun 22, 2009 | Wurlitzer Jukebox 1015 One More Time...

1 Answer

When turn on loud hum


Hi, this will happen when the motor become unstable. unfortunately, it isn't a failed component and, the motor will continue to operate in this situation with no defects. its just poor ,manufacturing within the motor design. you can purchase another motor and it will kill the hum.

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Pioneer Receiver SX-750: Getting a loud hum through the speakers


The hum you hear from the speakers and from the unit itself originate with 60hz AC power. They may not actually be related. Sometimes a transformer will hum slightly and unnoticeably. That you're getting a loud speaker hum says there is an electrical leak or a grounding issue somewhere.

Do all sources produce the hum or, say, just the phono? How about on headphones? Try rotating the AC plug. In those days they weren't keyed with one large blade as they are now.

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500X emitting feedback squeaking


One source of hum is from bad rectifiers in the car alternator, if this problem stops when key is turned to accessory then have your alternator checked for bad rectifiers.Good luck and please don't forget to rate.

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1 Answer

Hum when attached to an external amp.


The simple soloution is to buy a "buzzstop" .Its a box with an input and output and eliminates hums, I bought it from a company in Ireland www.bluered.ie or you could try powering the jukebox and the amplifier from the same socket to see if its an earth hum

Feb 19, 2009 | Wurlitzer Jukebox 1015 One More Time...

1 Answer

The power fuse blows as soon as the unit is plugged in


There is a problem with the amplifier within the sub. Many of these units never completely turn off. They are often set to automatically startup when a signal is detected. This may be the case here. The loud hum as a defect in the output amp section. At this point you probably have a blown amp section. The "protection" for this is to cause a dead short that will open up the fuse. This unit will require service. It is unlikely that any service info is availabel to the general public either.

The fix could be simple, but without seeing the unit, I can not state that for sure.

Keep us posted.
Dan

Feb 03, 2009 | Dual L8SW Subwoofer

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Philips CDR775


Bad earth / failed capacitor on the PSU board. I sell replacements via ebay or can email a service manual for you to get fixed locally. Fluffcat1

Oct 24, 2007 | Teac CD-RW880 CD Player / Recorder

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