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Posted to uk.rec.audio,alt.audio.equipment,rec.audio.misc,rec.audio.tech,uk.rec.audio.vinyl
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Hi all,
I have an old Sharp AM/FM receiver with an 8-track player. Made in Japan ca. 1975 or something. It had a BSR turntable which was broken. I removed the seized turntable, cleaned the whole unit, sprayed all the pots, replaced the three little 6V bulbs behind the black/green tuner window, and it is fabulous. It's built like a tank and weighs a ton. The pots feel like military grade stuff. The function switches are simply unbelievable. The front panel is white (OK, bone now) with black controls, the box is all wood with the then-standard "vinyl wood veneer". I have a spare turntable which works perfectly. I intended to connect it to the phono preamp of this receiver. I did, but I am not getting sound. I am getting low-frequency pink noise, but no audio signal. What is even stranger is that I hear one of the channels "pop" when I dis/connect ONE of the two RCA audio cables going into the phono preamp of the receiver. I tested all the cables after extending them, and they are OK (see below). I tried connecting the turntable signal to the line input, and it DOES work. Of course, the signal is VERY low, but you CAN hear the LP playing with the volume full up. So either I DID somehow **** up the audio cable assembly (it tests OK though!) or the phono preamp is partially or totally NG, in which case there is probably nothing that can be done. The line inputs can be used for a CD/DVD player, the receiver works as a 4-speaker unit or 2 main/2 remote speakers, and it sounds great. AM and line in are loud as hell, FM volume is about 30% of that, but still usable. Does anyone have any idea what I should do first? I want to determine exactly /what/ in the chain from the *turntable audio cables/cable extensions/original RCA plugs and cable/circuit board* is NG. (The phonograph audio cables were only long enough to reach the bottom of the turntable, which was 3 inches above the main circuit board, now they have to reach to the back and out of the unit, so I had to add about 8 inches of cable - but I tested the cables, both channels, live /and/ ground, and I made NO mistakes - everything was connected/soldered correctly. If the phono preamp is dead, it's dead. The unit is still a /great/ AM (and decent FM) receiver and line-in amplifier, handles TWO sets of stereo speakers, and it will outlast all of us. I have yet to find an 8-track cartridge, but the mechanism and all the belts seem fine. Plus I don't think anyone needs an 8-track deck, while /quite/ a few people might enjoy having a receiver with a phono preamp. Unless the phono preamp IS dead, of course. But maybe someone can help me determine if it actually IS dead... I /tried/ to make this short, really! Any advice will be greatly appreciated. -- Any mental activity is easy if it need not be subjected to reality. |
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