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I have a mesa boogie f-100 guitar amp that seems to not have enough power its alot quieter than other 100 watt stack and alot of buzzing when not in use

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Sounds like you need new power tubes (they are the larger ones closest to the opening in the back).  When replacing power tubes it is extremely wise to replace all 4 at the same time.  If you an not comfortable doing this on your own, take it to your local shop/guitar amp tech.

Posted on Aug 18, 2008

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How many watts per channel in a technical pro rx55uribt 1500w reciever


What is in a Watt.
Although Watt should be a dimension of power (current times Voltage) most manufactures give numbers you can't use. They always speak of maximum power. That number only can be reached in a laboratory and is measured on a clean resistor. They try the lowest resistor (not an impedance) the amplifier can work with, without blowing the end stage.
Then they put a free marge to tell you it should have a musical power of xxxx Watts. The output differs for speakers of 2 ohm, 4 ohm or 8 ohm. But there is not one speaker with an impedance over the whole audio spectrum.
Just read something over audio and power amplifiers.
The output has nothing to do with the quality of the sound. I have heard 15 Watt amplifiers perform hundred times better then some kilowatt amps.
Even if the manufacture says the amp is 1500 w it could be within legal limits and fir the amp is measured and can't deliver 100 watts of real power nobody can do a thing, because the watts could be the musical power. and that is a free invented non measurable measure. I don't even want to start over distortion, because the cheaper amps do produce more distortion, than music. If you use it for a sub woofer that is no problem, because you feel more than you hear.

Sorry for this big story and not saying what the real output is, because nowadays nobody bothers measuring amps like this.
The more serous audio magazines, will put some test about amps, and you should read one or two test to know what I mean about the worth of watts in audio.

Jul 12, 2014 | Audio Players & Recorders

1 Answer

Fisher ca 880 specs


There is a bad driver for the final amp. The oscillation is called motor boating. You need to take it for repairs unless you know how to solder, have test equipment, want to buy the schematic and the parts.

Apr 17, 2014 | Fisher Audio Players & Recorders

1 Answer

I have a Sony STR-DE135 receiver emitting a persistent hissing sound on all functions and inputs (CD, Tuner, TV/Sat, MD/Tape, Video). I have a pair of Boston Acoustic CR5 speakers attached. Any ideas on...


most hissing problems come from earth issues within the system them selves, i dont recommend taking the case of and plugin it in to start testing if its an earth problem. So my best solution is to simply take it your local music or electrical shop and pay for a repair or see id they can diagnose the issue, other than that i dont have a solution for you. I have a little guitar amp which was buzzing it's little heart out, but when i touched my guitar strings the buzzing stops (as i become the earth on touching it) so i tried my guitar on a different amp and it was fine, so my little amp was the problem, i took it apart and noticed that the screw for the earth was loose, once i tightened it the problem stopped and all is good. best regards.

Oct 30, 2013 | Sony STR-DE135 Receiver

1 Answer

What is the output for a JVC RX-317? whatever it is .. is that sufficient enough to push a frequency response 40hz-25kHz?


What kind of question is this? Push a frequency range with no other context??? Heck, sight unseen I'd say yes but it would be meaningless without the following considerations...


Amplifiers push POWER (Watts) through a specified LOAD (Ohms) within a freqeuncy bandwidth at a specified + or - dB level and with less than a specified amount of distortion for comparison to other amps.

Besides, 40hz-25kHz is itself deficient on the bass side and ultrasonic overkill on the high side. The range of 20-20K is more commonly used for audio specs. From the few user reviews I found I imagine it will push 80-100 watts cleanly into 8-ohms across the audible bandwidth. Like any amp, exceed its capacity at the risk of its and your speakers' well-being.

I can't find any authoritative specs for it.

Sep 14, 2011 | JVC RX-317 Receiver

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I have just bought a new Onkyo TX-NR808 and set it up over the week end with new 'accusound' surround sound speakers. Have bi-amp the front speakers. I don't think I am getting very good sound out of it?...


Depending on the amplifier, it might not provide enough power (in Watts) to the speakers. If the speakers require more power, it won't be as loud.

Mar 06, 2011 | Onkyo TX-8222 Receiver

1 Answer

I have recently acquired a old Denon AVR3801 Home cinema Receiver. I have plugged it all up and switched it on, but although the system seems to work quite nicely, the amp itself makes a buzzing/humming...


The solution of leaving the thing on all the time would certainly work, but most of the time a buzzing sound inside a relatively robust audio amplifier is being caused by the huge transformer coil in the thing. Or wires that are in close proximity thereto.

In some ways, you're blessed that the buzzing is coming from the unit itself, and not through the loudspeakers.

Mar 06, 2009 | Denon AVR-3801 Receiver

2 Answers

Hello, I get a mild electric shock from the strings on my bass guitar after i have turned my amp on. Nothing seems to be wrong with the bass itself and i have checked the plug for loose wires or split...


Hi FR101621

This is not good, you should not get electric shocks of any part of your gear. I strongly suggest that you take it to a qualified electronics guy that can perform an electrical safety check on it for you. It may be that the earth potential of your mains is different to the earth potential of the floor you are standing on. This may cause a small shock(would depend what country you are in and the mains system supply you are using). In any case, I would (for your safety) get it checked and tagged as safe. This is the only way to be sure you wont eventually GET KILLED!! Does not cost alot, usually about $30. Then you know it is good

regards
robotek

Oct 12, 2008 | Audio Players & Recorders

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 Players & Recorders

1 Answer

I have a Holden Wasp XL base amp. 100 watt?? Quite old, 70's ish. CAn you tell me how many and what size speakers it will run. Thanks, Lance


hell yer, built in New Zealand... or Aussie, cant remember. Best sort of speaker box for bass is 4 x 10inch quad box. Next. a single 15 inch, or use both together. The head you have I think was more of a PA system than a bass amp, but will certainly do the job. So long as you are not trying to keep up with a Fender twin, or a Marshall stack. 100 watts don't go far for bass. I would go for the single 15 inch driver to more the most air.

regards
robotek

Jul 06, 2008 | Audio Players & Recorders

2 Answers

One speaker buzz when cold


It works fine for a couple of minutes the starts to hum. If you turn up the volume it masks the noise but is till audible, also the video switching cuts out. after examining the components I have seen some heat discoloration in the power suply area and believe it to be power for the video board. disconecting the ribbon cable form the video board the hum goes away, and so does any video wich does'nt matter for me because my monitor1.gif does all the HD video1.gif switching. hope this may help with some noise problems.

Jan 23, 2008 | Harman Kardon AVR 225 Receiver

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