1953 ami e-120 jukebox no sound

CoinTech wrote:Somewhere in the back of my mind I'm thinking the muting on that box is in a set of switches on a relay on the turntable or by the tone arm.

There is no mute circuit on these phonos.

Rob?NYC

pirch53 wrote:Would a tube still light up even if its bad? I can get another tube and try that.

If you are sure you did try to induce ah um by doing the test properly, the next test is to connect a multimeter with an low voltage AC scale to the pickup plug and play a record. You should see some very low voltage, about 1/2 to 1 volt -varying with the music. if not, do an ohnmeter test between the cart pins and the plug. There should be near zero ohms resistance from one pin on the plug to it's respective connector on the cart and open circuit from that pin to the other side (no short).

You can use either another 6SN7 or 6SL7 for test purposes.

Again, if this amp has not been properly rebuilt, it is time.

Rob

Yes--a "lit tube" is no indication that a tube is good--it only serves to tell you that the filament is OK.

Okay so I checked the volume control and the wires going to it had seen better days so I replaced and soldered new ones on . When I hooked the volume control back I turned it all the way up and I do get a little bit of sound coming out of the speaker. If I turn the volume control down in play mode the sound will fade away as if the volume control is working. I tested the pickup with a small screw driver again and with the volume all the way up I got a mild hum while the screw driver was in and it would go away when I took it out. I still have to test the tubes . I plan on digging the tester out this weekend . Thanks everyone for your help it is appreciated.

Found the problem it was an open resistor. I replaced it and its good as new. Thanks for the help

pirch53 wrote:Found the problem it was an open resistor. I replaced it and its good as new. Thanks for the help

But - where was this resistor, and what is its function?
To state that you found the problem and not provide the details is kind of meaningless to others on this board.

I talked with some one about the caps and resistors. I pulled the amp I realized that all the caps and resistors had been replaced. He had said to check and see if any of the resistors where open meaning to take my multimeter and put the prongs on either end of the resistor in ohms . If the resistor is working properly it should have a reading and would not be considered open. If it were open my meter would not give reading at all. So I checked all the resistors and got a reading on all except one. It was the resistor that went to the number 4 pin on the second 6sn7gt from the pickup plug. When checking it with the meter I got no reading at all. I went to the local radio shack and picked up the resistor I needed which was 330k 1/2amp . I came home and took out the open resistor and soldered in the new one and put it all back together. I turned it on and music to my ears ,it was working. While I was doing all of this I replaced the power cord for the amp and the volume control wires as they were looking a little old. The amp is working better than ever. Thanks

You "got lucky"-- testing resistors "properly" involves de-soldering one end, and reading the resistance. Depending on the tolerance of the resistor, it must closely match the color code (or value listed in the print). An "open" resistor, in circuit, can give you a random reading due to other items in that circuit. "Heat" also may be a factor--some resistors, as they age, tend to change value, when warm, to hot. IMHO, it is less costly to send an amp out to someone who has experience in electronic trouble shooting in the long run, as resistors/caps "changing value", can lead to expensive transformer burn out problems ! Ron Rich

I guess I did. Im just glad its working. Thanks to everyone for your suggestions.