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Post subject: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 1:25 am
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Hi, i have a Fender frontline FM 65R, when i turn on it, the sound is very very disturbed and sometimes when i turn on the drive it makes a loud noise like a bang. What can i do?


Could it be that the jack or amp or guitar input has oxidized?


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Post subject: Re: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 2:18 am
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Test the amp with no guitar plugged, nothing. Did it make this issue ?

If yes, nothing you can do yourself, bring amp to a tech.

If no issue; report


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Post subject: Re: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 7:51 am
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Ok thanks, when i turn back at home i'll try


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Post subject: Re: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 10:08 am
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@stratele52 ok , the amp whitout the guitar it dont't make any noise


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Post subject: Re: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 11:32 am
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Play with guitar cable jack in the guitar output, move it little bit to feel a loose connection in jack.

What other gear do you use when you ear the issue ?


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Post subject: Re: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 11:32 am
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Play with guitar cable jack in the guitar output, move it little bit to feel a loose connection in jack.

What other gear do you use when you ear the issue ?


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Post subject: Re: PROBLEM WITH AMP
Posted: Thu Jan 30, 2020 12:15 pm
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Always remove everything unnecessary when testing.

Unplug anything you have plugged into:

Foot Switch
PRE Out
PWR In

If you use stomp boxes, remove them. You should just have a guitar with a cable going straight to the amp input.

Looks like the FM65R has 2 input jacks. If one doesn't work, try the other one.

No effects loop on that amp right? If it does, take everything out of the loop.

If it doesn't work after removing all unnecessary stuff, try a different patch cable from the guitar to the amp.

If it still doesn't work try a different (known working) guitar if possible.

Let us know how all these tests worked out for you.


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Post subject: Re: PROBLEM WITH AMP
Posted: Fri Jan 31, 2020 1:06 am
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When i play with clean sound the amp work well, but when i turn on the amp effect, the sound is very disturbend, i solve it by standing still and playing. When i move the jack cable, makes strange, almost shrill noises


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Post subject: Re: PROBLEM WITH AMP
Posted: Fri Jan 31, 2020 2:20 am
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Andex wrote:
When i move the jack cable, makes strange, almost shrill noises


You may have few issues
Issue could be the cable or the input jack.
Input jack; see a amp tech to fix it ; it could be only some solder.

______________________
" when i turn on the amp effect, the sound is very disturbend, "
-Andex

Issue in the amp ; solid state components, solder in power supply rail ? See amp tech


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Post subject: Re: PROBLEM WITH AMP
Posted: Fri Jan 31, 2020 11:28 am
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+1 to the above. Also:
Andex wrote:
when i turn on the amp effect, the sound is very disturbed

When you say turn on the amp effect, do you mean reverb? Or do you mean it happens when you switch to the other (drive) channel?


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Post subject: Re: PROBLEM WITH AMP
Posted: Wed Feb 05, 2020 4:53 am
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Yes when i turn on the drive


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Post subject: Re: PROBLEM WITH AMP
Posted: Wed Feb 05, 2020 10:56 am
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This is a great amp, but its of an age that a good general maintenance is needed. All the jacks probably need to be resoldered. If the mounting threads on the jacks are stripped out, they should be replaced so the loose jack doesn't break the solder again. The large power resistors on the board should be resoldered. The pots don't really need cleaning unless they make noise. If cleaning doesn't work, there may be a problem with the control pots.
The controls on these amps are fragile. The shafts are set into a plastic rotating contact. If you pull on the knobs too hard to pull them off, it can pull the shaft out of the plastic rotor. This causes a loud crackling noise when the pot is turned. You can check for this by gently pulling on each control to see how far it pulls out. Normally its only a few thousandths of an inch. But if you see one or more that pull out an appreciable amount, that means the contact on the rotor has less pressure against the substrate of the pot and it crackles as it looses contact.
You can pull the pot, disassemble it and super glue or epoxy it back together. It needs to be clamped down to ensure proper contact spring pressure until the epoxy cures. You might still be able to find some of these controls at Antique Electronics.


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