help with Harman Kardon 330A

baria · 14th June 2006, 07:28 AM

I just found an old HK 330A in a garage sale and hooked it up to my speakers ( I tried both A & B speaker systems). As I turn the receiver dial, I see the levels responding in the dial on the left, but there's no sound from the speakers. I'm a total novice - what could be the problem? Any help with this amp much appreciated, since it looks and feels to be in good condition. Thanks.

anatech · 14th June 2006, 01:19 PM

Hi baria,
Normally Harmon Kardon does not use a speaker relay system. Have a look at the rear panel for main in - pre out jacks. There should be a loop there for each channel. An RCA patch cord will work fine.

Also check that you do not have a tape monitor switch pushed in.

Let us know. I don't happen to have a diagram for it, so you may need one.

-Chris

baria · 14th June 2006, 05:31 PM

Thanks Chris, I'll take another look and let you know. By the way, I meant that I had tried wiring the two speaker wires (left and ground, right and ground) first in speaker system A and then in speaker system B. The wires go straight from the speaker to the screws in the back panel. I made sure the screws were well tightened over bare wire.

anatech · 14th June 2006, 05:33 PM

Hi baria,
The "A" and "B" sets go to the same amplifier circuits through a switch. I didn't expect there would be a difference between the two positions.

-Chris

baria · 14th June 2006, 07:15 PM

Chris, thanks! I patched the main amp and pre-amp ins and outs and it works. Nice sound. Another question: I lose sound on and off in one or both speakers when I turn the volume knob. I've heard people talk about blowing air around the knob to clean the connections - do I need to take the front panel off to do that? If it's an usoveable problem, I can lve with it, but would like to fix it if possible.
Thanks again.

anatech · 14th June 2006, 07:49 PM

Hi baria,
You need to use proper control cleaner. Not the stuff Radio Shack sells, or tuner cleaner.

De-Ox-Id, or Deoxid (different) are about the best. You only want to clean the metal slip ring. If you use a spray can, the smallest amount you can that clears the problem. More is not better!

You have to get behind the front panel. Take the top and / or bottom covers off to gain access. There is a slot on the bottom of the control for each channel. The terminals come out there.

-Chris

14th June 2006, 07:28 AM	#1
baria diyAudio Member Join Date: Jun 2006	help with Harman Kardon 330A I just found an old HK 330A in a garage sale and hooked it up to my speakers ( I tried both A & B speaker systems). As I turn the receiver dial, I see the levels responding in the dial on the left, but there's no sound from the speakers. I'm a total novice - what could be the problem? Any help with this amp much appreciated, since it looks and feels to be in good condition. Thanks.

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14th June 2006, 01:19 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi baria, Normally Harmon Kardon does not use a speaker relay system. Have a look at the rear panel for main in - pre out jacks. There should be a loop there for each channel. An RCA patch cord will work fine. Also check that you do not have a tape monitor switch pushed in. Let us know. I don't happen to have a diagram for it, so you may need one. -Chris

14th June 2006, 05:31 PM	#3
baria diyAudio Member Join Date: Jun 2006	Thanks Chris, I'll take another look and let you know. By the way, I meant that I had tried wiring the two speaker wires (left and ground, right and ground) first in speaker system A and then in speaker system B. The wires go straight from the speaker to the screws in the back panel. I made sure the screws were well tightened over bare wire.

14th June 2006, 05:33 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi baria, The "A" and "B" sets go to the same amplifier circuits through a switch. I didn't expect there would be a difference between the two positions. -Chris

14th June 2006, 07:15 PM	#5
baria diyAudio Member Join Date: Jun 2006	Chris, thanks! I patched the main amp and pre-amp ins and outs and it works. Nice sound. Another question: I lose sound on and off in one or both speakers when I turn the volume knob. I've heard people talk about blowing air around the knob to clean the connections - do I need to take the front panel off to do that? If it's an usoveable problem, I can lve with it, but would like to fix it if possible. Thanks again.

14th June 2006, 07:49 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi baria, You need to use proper control cleaner. Not the stuff Radio Shack sells, or tuner cleaner. De-Ox-Id, or Deoxid (different) are about the best. You only want to clean the metal slip ring. If you use a spray can, the smallest amount you can that clears the problem. More is not better! You have to get behind the front panel. Take the top and / or bottom covers off to gain access. There is a slot on the bottom of the control for each channel. The terminals come out there. -Chris