Hk 330

oogared · 13th July 2006, 11:14 AM

I picked up an HK 330 from a friend to use for a basement radio/reciever, and it worked fine until recently. The right side speaker cuts out without warning, sometimes it just buzzes at a low volume. I checked the physical jacks and they seem ok and theres no fray in the wire. Another thing which makes me wonder is that switching it to mono when it cuts out cuts both sides out, and even the headphones will cut out on the right side. Also, the volume control doesnt seem to have an effect on the buzzing/cut outs. My thought is that it might be a grounding issue, or dirt somewhere on the board, but as to what in particular is having the issue, I dont know. Any ideas?, other than just tossing it, which is an option Im considering.

anatech · 13th July 2006, 12:41 PM

Hi oogared,
As a first guess, I'd clean the controls and switches. Use a real control cleaner - not tuner cleaner, not from Radio Shack.

-Chris

oogared · 13th July 2006, 04:26 PM

Ok, I understand the anti-radioshack vibe, the only place I can think of that would carry contact cleaner would be partsexpress... and they have "Tech Spray" is that any good? Or would DeOxit be better? Or am I way off the mark here...?

anatech · 13th July 2006, 04:55 PM

Hi oogared,

Quote:

Or would DeOxit be better?

Perfect!
Use only as much that is needed. Don't make anything "swim".

RS used to sell control cleaner that was basically tuner cleaner or contact cleaner. You need to buy from people who know what they are selling.

-Chris

latala · 13th July 2006, 06:30 PM

Its Thirty years old!!! and treat it as a treasure I have a dozen or so Hk,s and I love them all 1
However I have found that a no of them have developed intermittant problems with the plasic case transistors small signal types. They have gone leaky and as such its a new phenomena to me can any one explain this change them and the unit works.
Moving back to the HK try connecting another amplifier to the preamp out links etc this will confirm if the fault is pre or power section
other than that post it to me in the Uk and i will look at it for you if you cover transit costs
anything to save a hk
regards Trev

anatech · 13th July 2006, 06:40 PM

Hi latala,
That's because Harmon Hardon decided to run them close to their maximum Vce in some models.

Without any further information from oogared I'm not willing to point to that as a cause.

-Chris

latala · 13th July 2006, 08:11 PM

Anatech
I can not see that being the problem as the rail voltage is only 12
however when i get a bit of time i will put it on the forum as i dont want to hijack this thread its just a possibilty!
regards Trev

anatech · 13th July 2006, 08:28 PM

Hi Trev,
The 730 was famous for that problem.

-Chris

anatech · 13th July 2006, 09:11 PM

Hi Trev,
Rail is 32V on that guy for the amp section.

-Chris

djk · 14th July 2006, 06:41 AM

http://manuals.harman.com/HK/service...K330B%20sm.pdf

http://manuals.harman.com/HK/service...K330C%20sm.pdf

http://manuals.harman.com/HK/service...HK430%20sm.pdf

http://manuals.harman.com/HK/service...HK630%20sm.pdf

http://manuals.harman.com/HK/service...HK730%20sm.pdf

http://manuals.harman.com/HK/service...HK930%20sm.pdf

13th July 2006, 11:14 AM	#1
oogared diyAudio Member Join Date: Aug 2005	Hk 330 I picked up an HK 330 from a friend to use for a basement radio/reciever, and it worked fine until recently. The right side speaker cuts out without warning, sometimes it just buzzes at a low volume. I checked the physical jacks and they seem ok and theres no fray in the wire. Another thing which makes me wonder is that switching it to mono when it cuts out cuts both sides out, and even the headphones will cut out on the right side. Also, the volume control doesnt seem to have an effect on the buzzing/cut outs. My thought is that it might be a grounding issue, or dirt somewhere on the board, but as to what in particular is having the issue, I dont know. Any ideas?, other than just tossing it, which is an option Im considering.

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13th July 2006, 12:41 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi oogared, As a first guess, I'd clean the controls and switches. Use a real control cleaner - not tuner cleaner, not from Radio Shack. -Chris

13th July 2006, 04:26 PM	#3
oogared diyAudio Member Join Date: Aug 2005	Ok, I understand the anti-radioshack vibe, the only place I can think of that would carry contact cleaner would be partsexpress... and they have "Tech Spray" is that any good? Or would DeOxit be better? Or am I way off the mark here...?

13th July 2006, 06:30 PM	#5
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	Its Thirty years old!!! and treat it as a treasure I have a dozen or so Hk,s and I love them all 1 However I have found that a no of them have developed intermittant problems with the plasic case transistors small signal types. They have gone leaky and as such its a new phenomena to me can any one explain this change them and the unit works. Moving back to the HK try connecting another amplifier to the preamp out links etc this will confirm if the fault is pre or power section other than that post it to me in the Uk and i will look at it for you if you cover transit costs anything to save a hk regards Trev

13th July 2006, 06:40 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi latala, That's because Harmon Hardon decided to run them close to their maximum Vce in some models. Without any further information from oogared I'm not willing to point to that as a cause. -Chris

13th July 2006, 08:11 PM	#7
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	Anatech I can not see that being the problem as the rail voltage is only 12 however when i get a bit of time i will put it on the forum as i dont want to hijack this thread its just a possibilty! regards Trev

13th July 2006, 08:28 PM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Trev, The 730 was famous for that problem. -Chris

13th July 2006, 09:11 PM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Trev, Rail is 32V on that guy for the amp section. -Chris

14th July 2006, 06:41 AM	#10
djk diyAudio Member Join Date: Feb 2001 Location: USA	http://manuals.harman.com/HK/service...K330B%20sm.pdf http://manuals.harman.com/HK/service...K330C%20sm.pdf http://manuals.harman.com/HK/service...HK430%20sm.pdf http://manuals.harman.com/HK/service...HK630%20sm.pdf http://manuals.harman.com/HK/service...HK730%20sm.pdf http://manuals.harman.com/HK/service...HK930%20sm.pdf

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