Becker 374 unbalanced balance

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Giles
300 SL Gullwing
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Becker 374 unbalanced balance

Post by Giles » Wed 30 May, 2012 12:05 am

For those that may know the Becker 374, as fitted in my recently acquired W116 450SEL.
Mine has a balance problem, the left channel is much louder than the right. I have tried another fader but the problem remains. I reverse the fader and the right is of lesser volume. I half plug in the fader and the left is fine, do the same for the right but it's faint. I turn the volume up and the rights fine but way too loud on the left. There's no balance control on the unit, is there an adjustment elsewhere? Do these system have a common ground, if so there may be a connection out ot phase perhaps?

Regards,

Giles
1981 500SLC (Colour Black) Keeper car 'Lola' walks like woman, talks like a man
1999 E430 Avantgarde Royal Indigo (Colour 339) Mums Taxi 'Claudia'
1975 280CE Signal Red (Colour 568H) Project 'Ginger'
1980 C107 Classic White (resto project) 'Marilyn'
1999 W163 ML430 MB Search & Rescue Vehicle
1978 C107 350SLC Red 'Scarlett' the parts car. Quite frankly my dear, I don't give a damn.
http://www.kudoscc.com.au

ben108
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Re: Becker 374 unbalanced balance

Post by ben108 » Wed 30 May, 2012 10:33 am

I would suspect that the right side amplifier is shot. If you are capable, jump in there with a soldering iron and replace the electrolytic capacitors.
W108 3.5
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Giles
300 SL Gullwing
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Re: Becker 374 unbalanced balance

Post by Giles » Wed 30 May, 2012 10:05 pm

Located the amp behind the glove box. Pulled it apart and no sign of leaking capacitors and all the solder joints looked OK.
Proceeded to pull the unit out and found a balance control on top of the unit.
It required a small flat head screw driver inserted for adjustment, so I decided to remove the top just to see what was inside. I gave the adjustment a few swivels and applied some downward pressure and all is functioning fine with the exception of the cassette deck, it doesn't hold the tape in.
I"ll work on that later.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car 'Lola' walks like woman, talks like a man
1999 E430 Avantgarde Royal Indigo (Colour 339) Mums Taxi 'Claudia'
1975 280CE Signal Red (Colour 568H) Project 'Ginger'
1980 C107 Classic White (resto project) 'Marilyn'
1999 W163 ML430 MB Search & Rescue Vehicle
1978 C107 350SLC Red 'Scarlett' the parts car. Quite frankly my dear, I don't give a damn.
http://www.kudoscc.com.au

GNGSTA
170s
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Re: Becker 374 unbalanced balance

Post by GNGSTA » Thu 31 May, 2012 6:49 pm

Sounds to me like a phasing issue.
1969 W108 280S - parts/future project, too original to cut up - Sold 28/8/13
1971 W109 300SEL 3.5 - newest purchase, current project, keeper
1972 W108 280SE 3.5 - project on back burner - Sold 30/7/14
1996 W210 E320 Elegance - Daily driver
2003 VW B5.5 Passat 1.8T - wifemobile - Sold/Traded in without me knowing while on the way to work
2013 VW Jetta TSI twin charged - new wifemobile

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Giles
300 SL Gullwing
Posts: 3021
Joined: Mon 10 Nov, 2008 3:14 pm
Model you own: I own multiple different models
Location: Australind W.A.
Contact:

Re: Becker 374 unbalanced balance

Post by Giles » Thu 31 May, 2012 9:37 pm

GNGSTA wrote:Sounds to me like a phasing issue.
I beleive it was more like a dry joint in the balance control.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car 'Lola' walks like woman, talks like a man
1999 E430 Avantgarde Royal Indigo (Colour 339) Mums Taxi 'Claudia'
1975 280CE Signal Red (Colour 568H) Project 'Ginger'
1980 C107 Classic White (resto project) 'Marilyn'
1999 W163 ML430 MB Search & Rescue Vehicle
1978 C107 350SLC Red 'Scarlett' the parts car. Quite frankly my dear, I don't give a damn.
http://www.kudoscc.com.au

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