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Epihone guitar tube amp puts out a lot of static even when there is no puitar plugged into it and all control knobs are turned down to zero. When the guitar is played the sound cuts off intermitently. I cant seem to bring it on by anything that I do. I have tried different guitars, different cables, wiggling the input jack and changed the tubes. Any ideas? Thanks

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6 Suggested Answers

tech240
  • 169 Answers

SOURCE: hi i have a laney

could be a dry solder joint, turn it off and then check all connections , use a magnifying glass, makes life easier.

Posted on Apr 30, 2008

  • 4234 Answers

SOURCE: PEAVEY TRANSTUBE AUDITION 110. PLUG

There should be an 8 pin IC close to the input jack that will be marked 4558 or 4560. This is an Op-amp Ic that is the most likely cause of the problem. Replace that IC and report the results here.
Dan

Posted on May 28, 2008

SOURCE: Crate Vintage club 212 60

I just bought the Vintage Club 60 and am loving it. $300..Pretty good deal huh! Plenty of bass...Have you tried the low boost and mid boost switches? they completely change the way the amp sounds. Also the stock speakers are **** so I'm dopping some Celestion Vintage 30s. Also is anyone getting some tube jingle with the VC60? I'll probably have to take it to someone...

Posted on Nov 04, 2008

dburns60
  • 410 Answers

SOURCE: I have a

Even though I don't have a schematic, if you have a VOM, (Volt-Ohm, Milli-Ammeter) we can start. Just because tubes are old doesn't mean they are used up. If a tube doesn't light up that would be a bad one, but they are in parallel off a winding of the power transformer. 1.) Check the on/off switch with the ohmmeter and the line cord for conductivity. 2.) Check the primary winding of the transformer for a low ohms reading. (less than ten ohms). 3.) Some where between the power switch and the pwr. trans. should be a fuse. After these three you should be able to put 120vac. to the unit and bring it back on. Get back with us, Dale

Posted on Aug 04, 2009

  • 3250 Answers

SOURCE: Hi, i just bought a gnx-3 guitar processor and it hums loudly.

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Sounds like a bad cable or pickup. Set the volume to a level that you can tolerate. You may want to turn off the amp between each of these steps. Unplug the cable from the amp; if the hum does not go away you have problems with the amp. If it does then plug the cable into the amp and short the end that plugs into the instrument. If the hum goes away it is the pick system in the instrument, if not you have a bad cable.
Good Luck
Gilshultz

Posted on Mar 01, 2010

  • 122 Answers

SOURCE: 1974 FENDER TWIN REVERB HAS

check the speakers try to connect another speaker.then check the output transformer and the resistances at the bottom of the 6L6 tubes.then check the bases of output tubes and the output tubes matching trimmer if your amp have it.then check change the volume pot.then check the ceramic capacitor i n the input of the last 12ax7 tube in the power amp input.

Posted on Jun 13, 2010

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2 Answers

Why could my volume knob be stuck on max volume and not adjusting?


There is probably grease or dirt on the contacts inside the unit. Here's a video that shows you how to fix it:

http://www.youtube.com/watch?v=y4XF9PoidJQ

Hope this helps!

Aug 08, 2014 | Marantz SR-4320 Receiver

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Mackie 450, signal light off, Sound only comes out when amp. turned up above 75%, when usually used at 40-50%. too loud at 75% and UP, does not Work at ALL below 75%. only 2 years old, with 25 uses... i...


Doesn't sound like a fuse. They don't fix themselves when you reach 75%.

Try shaking the volume knob while in the 30-50% range and/or try (with the power off) rotating the volume knob numerous times from 0% to 100%. If when you plug it back in it responds ANY differently, you might have a bad volume potentiometer. If when you shake the knob you hear static or intermittent sound, you have a bad volume pot.

The only other thing I can think of is that the wiper of the volume pot is not in contact with the windings inside the pot until you reach the 75% mark. When the volume comes on at 75%, does it start off kind of "static" then come in loud and clear? Also try this.... adjust the volume pot to 74% (or when the sound just begins to come on). At this point shake the knob. If you hear static, replace the volume pot.

Unplugging it when still on shouldn't cause any damage... in fact it probably hasn't considering it works at 75% plus.

Mar 14, 2008 | Audio & Video Receivers

1 Answer

Hi, i just bought a gnx-3 guitar processor and it hums loudly.


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Sounds like a bad cable or pickup. Set the volume to a level that you can tolerate. You may want to turn off the amp between each of these steps. Unplug the cable from the amp; if the hum does not go away you have problems with the amp. If it does then plug the cable into the amp and short the end that plugs into the instrument. If the hum goes away it is the pick system in the instrument, if not you have a bad cable.
Good Luck
Gilshultz

Mar 01, 2010 | Audio & Video Receivers

1 Answer

Why do the volume numbers on old receivers start


This type of calibartion is known as a logarithmic scale.
The numbers refer to decibels below the maximum output of the amplifier section of the reciever, or decibels of attenuation (making smaller/quieter).

Without going through logarithim theorey, the logarithim (base 10) of 1 is 0. So if 1 is the maximum output of the amp, as you turn the knob down from maximum you are adding more and more attentuation to the output (relative to maximum) and so the loudness of what you hear goes down, even though the number on the scale is going up !

Most peolpe associate decibels with sound levels, but anything can be measured in decibels, so long as there is soemthing to reference it against.

Nov 04, 2009 | Pioneer VSX-D409

1 Answer

My amp wont turn on


I have heard this problem occurs often with the vypyr I have heard to try and turn it oun without your guitar cable plugged in and it should work fine. If not try wiggling the guitar cable out a little and and should turn on and try and get the update for it.

May 06, 2009 | Audio & Video Receivers

1 Answer

My uncle just gave my son a g-100 amp. it is a old tube amp made by yamaha . it has a lot of scratchy niose. the amp works. someone said it might need to be cleaned. do you think that will work?. if so...


The g-100 is a solid state amp produced by Yamaha in the late 1970s.  If the "scratchy noise" is produced when turning the knobs, it can be cleaned by using a spray called "de-ox it" or an electronic contact cleaner and lubricant like CRC-56.  The best way to clean old rotary potentiometers (the electronic part of the knobs) is a good hard turning.  Moving the knob back and forth with firm gentle pressure can actually clean off residue and result in a cleaner tone.  Try to apply the cleaning spray to the knob stem only and to no other surfaces.  Another great electronics cleaner/spray is Contact ReNu made by MillerStephenson. If the problem persists you might want to take this amp to a pro repair guy. Good Luck! 

Jan 06, 2009 | Audio & Video Receivers

1 Answer

MY FENDER GUITAR AMPLIFIER IS MAKING A HUMMING BUZZING NOISE


Not sure yet, but before considering a fault with the amp, does it only make this humming noise when not plugged into the guitar? I am thinking that the cable might be faulty.

If it while the cable is plugged in the guitar, does the humming disappear when you turn the volume control(s) down on the guitar? I am thinking that one or pickups may be faulty.

Sep 14, 2008 | Audio & Video Receivers

3 Answers

1974 FENDER TWIN REVERB HAS NRE TUBES NEW FILTER CAPS AND WAS REPAIRED BY RETIRED AUTHORIZED FENDER TECH. PROBLEM AMP HAS VETY LOW OUTPUT UNTIL YOU CRANK IT TO 8-10 THEN IT SOUNDS HORRIBLE DISTORTED AND...


This sounds like a power supply problem. The high voltage for the tubes is not right. Either you are missing an amplification stage because this or one of the coupling caps is faulty. I'd have to see the unit itself to give you any more details.

Dan

Jul 22, 2008 | Audio & Video Receivers

1 Answer

PEAVEY TRANSTUBE AUDITION 110. PLUG UNIT IN POWERS UP . SITS THERE AND HUMS LOUDLY. SPEAKER WORKS. plug guitar in can hear it faintly, push lead chanel button in , hum gets super loud. HUM IS IN PROPORTION...


There should be an 8 pin IC close to the input jack that will be marked 4558 or 4560. This is an Op-amp Ic that is the most likely cause of the problem. Replace that IC and report the results here.
Dan

May 27, 2008 | Audio & Video Receivers

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