Question about Grundig Classic 960 Shelf System

2 Answers

Power/volume rotary swtch

Rotatry switch spins without effect on power or volume. Where might i obtain a replacement?

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  • pjo180 Sep 08, 2008

    I have a Grundig Classic 960.  I believe that someone turned the Power/Volume knob past the off position.  The knob now turns, but has no effect on the volume, or power setting.  I have noticed that the knob can be pulled out of the radio. Part of the metal shaft of the control comes right out with it.  Apparently, the metal shaft on the control is made of a brittle material, and just sheered off.  Can a new control be purchased, and be user replaced?

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May be difficult unless you have some soldering skills, the double layered or stacked pot is 33.5 k ohm on each layer. One layer is the volume, the other layer is the tone control, it also has the spst off on switch attached. Matching this will be difficult, also the type of "arm" and the length are also have to be matched. If yu can find it or a suitable replacement, there is room to replace the part. Be sure the wires are put back correctly.

Posted on Jan 29, 2011

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I was able to change the volume with a small screwdriver.Not easily though,once you get it to the correct volume turn if off by unplugging.

Posted on Apr 12, 2010

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Posted on Jan 02, 2017

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4 ohm speakers are commonly used where a higher power output is desired at the cost of some quality of sound reproduction but depending on how the sound is listened to can soon overload some amplifiers primarily designed for 8 ohm as it will try and deliver more power into the lower impedance speakers and perhaps exceed the rating.

8 ohms is a safer choice. The lower the wattage rating of the speakers the more efficiently they tend to be able to reproduce sound at low volume levels so for background music in a small domestic environment the average power requirement will be in the order of half a watt so even with a high powered amplifier the volume would rarely be turned up above 1 - 2 on the typical scale of 10 and ten watt speakers would be more than adequate. It is unfortunate that it is almost impossible to obtain quality speakers rated at such an unfashionably low power rating.

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This sounds like a case of a dirty/defective rotary encoder. The volume control used here is not the conventional potentiometer type , but a rotary set of switches that tell the sytem if the knob is being turned left ot right.
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