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 Post subject: Help finding replacement speaker
PostPosted: Jul Wed 31, 2019 6:49 pm 
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Joined: Oct Wed 19, 2011 11:03 pm
Posts: 3
Hello Antique Radios!

I am in the process of fixing my sylvania exponent 4/40 record player. I just located a replacement cartridge which Im excited about installing.
I also noticed that one of the speakers didn't work, I was wondering what would be a good replacement speaker to get.
Any help will be much appreciated. I attached a picture of the old one which has several numbers on it.

Thanks!


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speaker.jpg
speaker.jpg [ 137.15 KiB | Viewed 259 times ]
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 Post subject: Re: Help finding replacement speaker
PostPosted: Jul Wed 31, 2019 9:22 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 9486
Location: Mountains of Mourne. Ireland.
Speakers rarely fail!

Duct-tape two short leads to a 1.5V battery - touch their ends to the speaker terminals.
You should hear a click when you make and break the connection.
(when testing any speaker in circuit)→ If there is no click, remove speaker and test again.

Be careful of the bare ends - - - do not short-circuit the battery.


Image

Speaker/s specifications are not listed in the factory service manual!
Image

Service information was published in Sams Photofact Set-892 Folder-7
ref: https://www.samswebsite.com/en/photofac ... h&s=Search

Three pages of service information for Amplifier Chassis P06-5 used in model Exp. 4/40-2
can be found in this comprehensive 1966 Sylvania service manual.
It's a 162MB download!
http://www.vintagesylvania.net/?page=do ... 0Hi-Fi.pdf

Checkout your NP (non polarized) capacitors C124 and C224 on the crossover boards.
5.0μF (microfarad) is an old value - use 4.7μF as a replacement today.
25V or 35V or 50V rated replacements are okay... :)

Here is a typical Magnavox crossover board with ferrite chokes.
Image

Your P06-5 crossovers highlighted below.
Image
Greg.

Edit: oh... I've just noticed the the total impedance for each set of sperkers is listed on the schematic as...
Total impedance 8Ω


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 Post subject: Re: Help finding replacement speaker
PostPosted: Jul Wed 31, 2019 9:47 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 9486
Location: Mountains of Mourne. Ireland.
Roll-your-own non polarized capacitors.

Example: connect two 15µF or 16µF (polarized) electrolytics back-to-back to make a NP (non polarized) 8µF capacitor.
Image

:) Greg.


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