Radio "Hiss" through speakers - Original Radio - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 10 (permalink) Old Apr 22nd, 14, 3:14 PM Thread Starter
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Radio "Hiss" through speakers - Original Radio

Not sure if this is the proper place for this post, hopefully you can give me some thoughts on my issue.

Background:
- I just installed my restored factory 1970 AM/FM 8-Track Radio in my Chevelle.
- The 2 Front and 2 Rear speakers were purchased through http://www.turnswitch.com/index.htm. (8 OHM speakers).
- The Wiring harness for the head unit is original (was checked out by the guy who rebuilt my unit) and the Rear harness is reproduction.
- I utilized the wiring from my original front speakers (made minor modification) and plugged them into my main wiring harness

Issue:
- The Rear Speakers (6x9) actually sound much better than expected, loud, clear, and nice bass (impressed with them actually)
- My Front Speakers (4x6) have a "hiss" or "static" in the background while playing my Radio. Only in the front, not in the rear. FYI -- Car is OFF, key on accy, nothing else running
- When I first turned on the radio the fronts did not play, I tapped one of them and they both came on. (have not been able to reproduce the effect again)
- I added an IPOD hookup to the head unit, when playing songs through my phone the Front speakers sound much better and I do not notice the hiss or static

I was originally thinking a wiring issue to my front speakers, however, now that my IPOD sounds fine running through the speakers I'm not sure where to start. Think a ground? Bad wiring? etc?

Any help is appreciate

Thanks,

Dave

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post #2 of 10 (permalink) Old Apr 22nd, 14, 3:34 PM
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Rich
 
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Re: Radio "Hiss" through speakers - Original Radio

Why not give Greg Thompson or his partner Dan a call at S&M Electrotech (turnswitch.com) since that's where you bought your speakers from. 877-780-2861 or 763-780-2861.

Something tells me that you'll get a better sense of direction from them instead of getting a bunch of guesses from here.

Rich
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post #3 of 10 (permalink) Old Apr 22nd, 14, 3:43 PM Thread Starter
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Re: Radio "Hiss" through speakers - Original Radio

I'll give that a try. Wanted to try and figure some things out on my end before I called them, pretty sure their speakers aren't the issue.

Thanks,

Dave

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post #4 of 10 (permalink) Old Apr 22nd, 14, 5:27 PM
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Re: Radio "Hiss" through speakers - Original Radio

[QUOTE=Birddog1970;5872537]I'll give that a try. Wanted to try and figure some things out on my end before I called them, pretty sure their speakers aren't the issue.

Yes Dave. I didn't mean to suggest that the speakers were at fault, but rather since you bought the speakers from them, they would be willing to take the time to walk you through the various possibilities. They're extremely knowledgeable and since they restore original radios as well as upgrade them to modern standards including compatibility with accessories such as I-pods, I would like to think that they can come up with some solid recommendations on where to trouble shoot or perhaps point out an issue with the radio itself.

Good luck.

Rich
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post #5 of 10 (permalink) Old Apr 22nd, 14, 7:42 PM
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Re: Radio "Hiss" through speakers - Original Radio

Talking out loud here-
Dosen't the blower motor run at a slow rate(low)when key in acc postion and car not running? or did that start later in the 70's with GM. Isnt there supposed to a capacitor(radio noise suppressor) on the coil and voltage regulator which may acct for the "hiss"?

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post #6 of 10 (permalink) Old Apr 22nd, 14, 8:57 PM
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Re: Radio "Hiss" through speakers - Original Radio

Ask the restorer if they replaced all of the capacitors in the radio. Some of the old style caps absorb moisture and deteriorate over time. I have restored old jukebox amplifiers and as a rule replace all the caps.

Tom
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post #7 of 10 (permalink) Old Apr 22nd, 14, 9:12 PM
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Re: Radio "Hiss" through speakers - Original Radio

Time to contact the restorer.

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post #8 of 10 (permalink) Old Apr 22nd, 14, 10:06 PM
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Re: Radio "Hiss" through speakers - Original Radio

AM band only, are all the stock noise suppressors in place on coil, regulator, etc?
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post #9 of 10 (permalink) Old Apr 23rd, 14, 6:30 PM Thread Starter
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Re: Radio "Hiss" through speakers - Original Radio

I'll have to check the AM band, the hiss is on the FM band -- thought odd only in fronts and not rear.

My understanding it was a complete nut and bolt restoration for the radio, I'll double check with the restorer as well.

I know I have a noise suppressor on the regulator, no for the coil. I have a suppressor that runs over to the heater box but that's not hooked up yet. When I had my am/fm mono hooked up I didn't have any issues, figured I would be fine with current setup for suppressors. I'll take a closer look at which ones are required and get them installed.

Appreciate everyone's feedback.

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post #10 of 10 (permalink) Old Apr 23rd, 14, 7:01 PM
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Re: Radio "Hiss" through speakers - Original Radio

My thoughts would be the wiring. Some original speaker wiring have a common ground for the entire speaker system. You have old and new wiring so they could be different you never know can't trust China to get it right.

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