Question about Peavey Valveking Vk100 Guitar Head
The thing is that when I am playing even at a low volume, suddenly something like a sound punches in, and a strange feedback o like a train sound starts to sound on the amp. The thing is that when it enters into this status, if you either slap (of course no hard) the head, the cab, even the cable, it will sound on the speakers. If anyone else has this same problem or a solution please help, even though ill go fix it soon if it starts getting worse. Ps: I haven't played yet at loud volumes like rehersals and it only has had been used like 15 times.
Sounds like one of your tubes going bad and becoming microphonic...
Google "Microphonic Tube" for additional info.
Posted on Nov 01, 2012
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Posted on Jan 02, 2017
The preamp section has a problem. It could be anything in the preamp but is OFTEN the input jack itself. They take a lot of abuse.
Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.
Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.
Posted on Sep 22, 2009
Yellow should be the positive. Try plugging in and reversing. The louder of the two is the one in phase and the correct wiring. If the speaker is pushing out when playing , it is in phase and correct also.
The distortion problem could be a speaker going out. It may not be totally blown, but may be verging.
Holding your hand out as wide as you can push against the speaker lightly. If there is a rubbing or scratching sound, the speaker could be damaged.If it moves freely, and there is no scratching its okay.
Another possibility is the clean channel may have a channel volume set to high. Make sure the clean channel volume is set lower than the master volume otherwise you can get distortion on that channel too.
Posted on Feb 21, 2011
You start by downloading the schematic here:
Scroll down to the link "Get Manual" and download the schematic. Note that it has several pages of parts list preceeding the schematic.
Next, put a 150 Watt incandescent bulb in series with the power cord to act as a current limiting fuse. Now replace the fuse and proceed with testing. You may find that one or more filter caps have shorted. Also pay particular attention the the BIAS power supply. You should see about -35 to -40 volts. Note that the series lamp will come on if excess current is being drawn and voltages will be low if the lamp lights. If the BIAS supply has failed, it is possible your power tubes have been damaged.
Posted on Mar 31, 2011
SOURCE: Peavey Audition 110 Combo: When
The problem is LIKELY a broken solder joint right at where the leads of the volume pot come through the circuit board. The broken joint will ozidize overnight and then when vibration rattles it it will punch through the oxide. INSPECT all solder for the pot leads. Lood for a TINY grey line in the menicus of the solder where the lead comes through the board.
Posted on May 10, 2011
SOURCE: I Have A Peavey Valveking
The answer all depends on the impedance of your speaker(s). A single speaker can be plugged into either jack. Set the switch to the impedance of your speaker. If you use two speakers, set the switch to one half of the impedance of the lowest impedance speaker. Very few speakers are 16 ohm types. Most are 8 ohms and some are 4 ohms. You could plug an 8 ohm into each of the jacks and set the switch to 4 ohms for example.
Posted on May 28, 2011
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