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Re: Sherwood RX 4105 no input for a turn table
Check for a line level switch on the turn table, it may be under the turn table itself lift the rubber mat and spin the table by hand, it may not have one or it could be on the back.
You can buy a phono amp that will boost the phono signal. Check at Radio Shack or google it.
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Pull the sherwood power cord from the wall for 20 minutes. On the back of sherwood, check all cables and make sure they are in the correct places. Check speaker wires and make sure they are connected. 1)After 20 minutes, turn power on to sherwood. 2) select an input (radio, cd, etc.) 3) Push play. 4) Turn volume to desired level.
when you turn your computer you should hear a sound of a relay initially and after about two seconds another sound, is the closure of the speaker relay models if you do not hear the sounds, the team has some short audio output.
if bose unit has built in amplifier .Then your sherwood would have to have a variable RCA output jacks in order to work with sub.Then bose audio input RCA cable would connect there.If bose unit does not have built in amp .Then you would connect sherwood left/right speaker outputs into bose left/right inputs .Then other bose speakers will connect to bose unit
Sorry to be the bearer of bad news but your unit has either a bad power supply or bad transistors and need serviced. Under 200 for the repair however, I'm not sure what the unit sells for new but weight the costs vs replacement. Hope this helps
The problem is the fact that the new receiver has no phono input. The phono input has an extra stage of amplification built in. Your receiver is working fine. You need to purchase a phono pre-amp. These run around $20. Connect the turntable to the preamp and the presmp output to any line level input on your new receiver and everything will work as expected.
You can also use 2SD2560 and 2SB1647 130watt 150volt 15amp transistor, but it may require some rebiasing the on output transistors. Sherwood have used these transistors in their older model receivers. I just replaced those transistors in my Sherwood RX-4105 Receiver, and they work good as well.
Before I install those transistor. I did a out of circuit 20volt 4amp DC current test to a 4ohm resistor @ 200watt load to compare 2SD2560 / 2SB1647 to the B2510/B1510 mounting them on 5 square inch, 1/8" thick piece of Aluminum, and the results of the test, the 2SD2560 / 2SB1647 heats up in 60 seconds to around 120 degrees F, and the B2510 and D1510 heats up in 30 seconds to around 120 degrees F.