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Amp problem Ami F-120
I am working on an ami f-120. when i plug the amp in the 5ug tube gets
hot very quickly. really glows bright. changed tube and it did the same thing. for some reason it seems to be drawing way to much current. anyone have a idea whats bad in it. cat see anything wrong on the underneath side. i took an amp out of another machine and it worked fine so it would seem the problem is in the amp itself. any help would be appreciated. thanks norm in missouri |
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Amp problem Ami F-120
On Sep 25, 4:25*pm, em pinball wrote:
I am working on an ami f-120. when i plug the amp in the 5ug tube gets hot very quickly. really glows bright. changed tube and it did the same thing. for some reason it seems to be drawing way to much current. anyone have a idea whats bad in it. cat see anything wrong on the underneath side. i took an amp out of another machine and it worked fine so it would seem the problem is in the amp itself. any help would be appreciated. thanks *norm in *missouri Try this test; with the machine at-rest --turned on, other tubes glowing but not playing, does the 5u4 still overheat? If not you almost certainly have either shorted filter cap or output transformer. The cap is the most likely due to AMI's stupid muting design that shuts off the B+ voltage between -records-! thus the filters take a hit each time a song plays. There is an outside chance that the wiring to the relay, or it's insulation has broken down, but the filter cans are prime suspect. I have had a J-200 and still have an I-200 stereo and modded those amps to not switch the B+ and connected a relay to the turntable motor circuit to switch the amp on at the start of play. |
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