The jumpers go from the pre out to the main in and are not necessary for operation. They are there in case you want to use a separate amp or a separate preamp.
I need help
I have, since 1975, an integrated amplifier by Sansui model AU 7700.
It had what I think were jumpers connected to the right and left entry RCA connectors of Phono 2 that I suppose were, in the absence of the Phono 2, to simulate it.
I also suppose that the jumpers have an specific impedance.
I recently send it to maintenance and the technician lost these jumpers.
If anyone is familiar with this equipment, and what I am calling jumpers, could you please check if I am right about my idea of their function and, if so, which is their impedance so that I can manufacture a replacement?
Thank you very much for any information.
Fabio
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- 19 posts total
Thank you viridian, dekay, celtic66 and dill, very much for your help and I also want to apologize for taking too long to give you an answer. Aplril 21 is a national holiday down here in Brazil and I have gests that got me very busy. First of all it is really a shorting plug for the right and left inputs that I’m looking for. Here is a picture of the rear panel of my amp with the two shorting plugs connected to the Phono 2 input channels. https://www.dropbox.com/home/Public?quickview=id%3AHADsFIwKRTgAAAAAAAAFTw Well, if working the amp without them won’t damage the amp, I’m OK. I found many plugs on the net but none show the resistance. Can I use one with zero ohms or a resistance will be necessary? |
What I have used with phono preamps in the past... 1: A basic RCA which has the Hot shorted to the Ground for use in unused INPUTS. 2: An RCA plug with a resistor soldered between the Hot and Ground for use in unused OUTPUTS (think I used a 100 K OHM in mine, but don’t recall why). I used the 2 above to reduce RFI and other noise contamonants on really inexpensive ($25) battery powered stereo phono preamps used as mono preamps (thus the unused inputs and outputs). The variable load switch on your amplifier only affects the phono 1 inputs (phono 2 is set at a fixed 47 - I think, but it is "fixed" to a single setting). I would just use phono 1 for now and see how it sounds on the different settings. I agree with Parker that your technician should be remedying the situation. PS: I can't see the photo you linked, but I'll Google later to see if I can find something.
DeKay
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Here’s a downloadable user manual (I was off by 3 as phono 2 is fixed @ 50-:). https://steampoweredradio.com/pdf/sansui/manuals/au7700%20operating%20instructions.pdf I’ve seen/used this amp when it was new (lots a veteran’s were buying it @ PX discounts just after the end of the Vietnam war) and I do not recall the plugs you are referring to - nor could I find a pic of them in use. My brother-in-law used one with AMT1's for a while and the pics brought back memories. DeKay
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- 19 posts total