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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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Amp goes to half power? Even after tube replacement.


How do you know it is going half power? did you measure this, or do you only hear half the power? because then also a speaker (or more) could be not working.

Jun 10, 2014 | Mesa Boogie Mesa EXpress 5:50 2x12 Guitar...

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I just bought mesa express 5 50 amp. After a couple of weeks the reverb control malfunctioned - no reverb, and the overall tonal quality drops. Is this a common problem? is it the tube?


Quite likely a valve. The only valve unique to reverb is V5. Clearly labled on the amp. Or check your manual. It's a 12AX7. You can't really swap it with another because they are all common to both channels. Just buy another - not expensive. If you have not changed valves before:
1. power off
2. let valves cool
3. identify V5
5. note the orientation by pin layout on your new valve.
6. remove valve (might have to wiggle gently)
7. do not force in new valve - pay close attention to orientation.

If it is not a valve, then it gets complicated, take it to a tech

Aug 22, 2013 | Mesa Boogie Mesa EXpress 5:50 2x12 Guitar...

1 Answer

Replacement howard cyclone fan 115VAC 50/60 HZ .16/.14 amps 12/11 watts for much quiet one for a mesa boogie mkIII


A47-B15A-15T1 by Globe Motors is what Mesa has been putting into the Mark IV and later. This one is what I have in two of my Mark IVs. It's a direct replacement for the howard fan

replacement-howard-cyclone-fan-115vac-50-bb3c1af2vlhqlb2gt5nw1yk2-1-0.jpg

Jan 14, 2013 | Cars & Trucks

1 Answer

This is on a 15 watt Peavey Vypyr. I have a buzzing at the bottom end of my amp, when playing on the low E string. I plugged in my headphones and the buzzing went away while playing. I have also raised my...


The voice coil on the cube speakers must be scraping against the magnet.Or the speaker cone must be damaged causing it to flutter at low frequency where there will be large cone movement. Try removing the phono jack from your musical instrument/ guitar and touch the tip of the jack with your finger. You will hear a hum, now turn down the volume and listen to the speakers very closely and see if you can identify the flutter. All the same you will have to fix the speaker or replace it. Have you ever dropped the speakers, if so the speaker frame could have warped causing the scraping noise.

Aug 08, 2011 | Peavey Vypyr 100 Guitar Combo Amplifier...

1 Answer

I have static in my 8/10 mesa cabinet. Its only in the second bank of speakers. The speakers seem to work and sound as good as the others in the cabinet but there is a weird light static sound that comes...


Sometimes there is a resonance with materials that are a part of the case or inside the cabinet that cause this. If the level is very low, don''t worry about it. I have even seen the logo on a speaker grill causing the noise... also debris inside or behind the grille...

Mar 25, 2011 | Mesa Boogie Mesa/Boogie 2x10 Vintage...

1 Answer

I play Gibson USA Sgs, one with 490/498 humbuckers and one with 57classics....The Amp has a loud buzz like feedback all the time on the overdrive channel.


If the amp is quiet with cables unplugged at the same settings as observing the buzz, the amp is OK.

In this case, cables and/or shielding and wiring in the guotar is suspect.

Guitar pickups are sensitive to magnetic fields and you can search out these fields by moving and orienting your guitar to find maximum buzz.

If the amp has objectional buzz with teh cables UNPLUGGED then the amp needs servicing. Filter capacitors among other things are suspect.

Sep 12, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Where can I get a schematic of the circuit board for the MG100DFX. The main fuse as blown and I need information on wiring connection to the transformer and values of other components.


Just a hint to troubleshoot: Connect a 100 Watt light bulb in series with the hot side of the power line into the amp. Make a cord with a light socket and a receptacle to plug the amp into. This acts as a resetable fuse and will send enough current through the amp to not fry stuff, but enough to do troubleshooting.

Apr 01, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

2 Answers

I have a peavey Renown 400 model 212 without speakers. What speakers should I install to replace the missing ones?


THe speakers should be a good quality and rated jointly at 1.5 times the power of the amp.

Nov 15, 2009 | Audio Players & Recorders

1 Answer

Celestion Neodog Speaker


the mesa is for guitar and is not more than 100 watts, the neo dog is 100 watts it will fit but will give a different character because can be push to another limit of saturation the vox doesnt give that much.

Sep 10, 2009 | Audio Players & Recorders

1 Answer

My spider III 15 watt buzzes whenever i have a cable plugged in.


MAKE sure you have it connected to a three wire circuit that has the ground. A lot of these style amps will buzz if they are left ungrounded.

Also search for sources of buzzing light light dimmers.

Further, power supply electrolytic filter caps are suspect.

Aug 23, 2009 | Line 6 Spider Iii 15 Modeling Guitar...

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