this was very interesting. Sadly, I have have heads that needing some restoring, but can't find anyone close to me to look at them, much less fix them.
I think you really needed to replace that fan, they are very cheap, it's not worth trying to lubricate them as the bearings will be on their way out. I've had a MG 100 HDFX for years, it has never let me down and it sounds very good for what it is. Probably my most used amp, I've got a couple of valve amps and two other solid state Marshalls, but the MG is always the one I go back to. Once you learn how to dial it in you can get some great tones from it.
Answer a question for me (if you can).......why is there an mg 100 dfx main board in an mg 100 "HDFX" chassis ???? I recently bought this similar amp from a private seller and found that the channel selection switch is not functioning correctly. After removing the amp from the cabinet, I found that the main board was not designated as a "mg100hdfx" but a "mg100DFX" instead. Do you have any idea why Marshall would have done this? Thanks
'HDFX' stands for 'HeadDFX', the only difference is this is an amp head and the DFX is a combo. Circuit boards are exactly the same, so no issues there.
I have a mg100hdfx actualy a pair of em but the master volume is very scratchy, would you suggest blowing it out first with aircan or with the suggested servisol can,. I have already got some CONTEC electrical spray lube aerosol but thought it might be a bit thick or the ol' WD40, would you suggest either of these? Oil is an insulator so id have thought maybe not to clean variable carbon resistors with. its also got noisy fan seems to be endemic with these amps. I got a four channel amp (prosound) between the mixer (behringer) as someone tld me beter to allow a low gain from seriesing the amps, and then the pair of mg100hdfx amps and theres quite a bit of noise from the mixer when first switched on, possibly input capacitors again? I dont notice it after it 'warms' up! - though theres no valves. also the digitech jam man has lost its no 1 slow blues track, is there anybody out there that would be willing to copy their card and post it to me please? ill pay you for a copy if you can do? i found the down load facility on it was slightly faulty and I had to down load each sub routine and 'best guess' patch them together - sort of worked. but then that pc i was using f'd up and was too dear to replace the disk drives, shame was a toshiba satellite. laptop. so i just use as it is. regards Frank. francisjkennedy3@gmail.com.
I would suggest Servisol or any kind if switch cleaner / electrical contact cleaner. You could be on the right track with capacitors. You can test that, let one of your amps warm up then spray any suspect parts with freeze spray. If the noise comes back, that's your bad part. Not sure about the other things. Hopefully someone can help!
Hey there, I was wondering if I could ask you a couple questions? I bought this from a guy who barely used it so he says. The clean channel is really loud even on 1, but the overdrive channel is so quiet, I have to turn the volume practically all the way up. Do you know if that is normal? Also the amp squeels sometimes at high volume and the fan is pretty noisy aswell
The fan bearings can dry out over time, it's really easy to just replace the fan, two wires... The plug off the old fan can be salvaged. That thing with the volumes doesn't sound at all normal. Maybe take a look inside it and see if you can see any capacitors that have bulged and leaked. 9 times out of 10, misbehaving old electronics are just down to bad caps... I found a vid that shows how to spot them - they can look fine but be bad, but most of time they are obvious! Let me know what you find ua-cam.com/video/cM-mx0_0pss/v-deo.html
Awesome video, I bought a used MG 100DFX and fan was starting to get noisy. Big help....Thanks!
this was very interesting. Sadly, I have have heads that needing some restoring, but can't find anyone close to me to look at them, much less fix them.
That really sucks! What have you got and what are the problems with them?
@@hydorah MG100FX. It randomly goes quiet, overdrive squeals. Works ok in clean channel with multi effects
@@40sndFan Manners, dear boy
@@hydorah Oh come on, it was 2 months ago you asked them. Haha all the best anyhow.
@@40sndFan Oh right! Sorry! So the all problems are only apparent on the drive channel? All OK otherwise?
I think you really needed to replace that fan, they are very cheap, it's not worth trying to lubricate them as the bearings will be on their way out. I've had a MG 100 HDFX for years, it has never let me down and it sounds very good for what it is. Probably my most used amp, I've got a couple of valve amps and two other solid state Marshalls, but the MG is always the one I go back to. Once you learn how to dial it in you can get some great tones from it.
Yeah it's a cool amp. That's fan's still going strong you know! Lubricating it sorted it right out
Answer a question for me (if you can).......why is there an mg 100 dfx main board in an mg 100 "HDFX" chassis ???? I recently bought this similar amp from a private seller and found that the channel selection switch is not functioning correctly. After removing the amp from the cabinet, I found that the main board was not designated as a "mg100hdfx" but a "mg100DFX" instead.
Do you have any idea why Marshall would have done this? Thanks
Circuit-wise, They are 100% the same amp, just the box is different. So the same board is in the combos and the heads
'HDFX' stands for 'HeadDFX', the only difference is this is an amp head and the DFX is a combo. Circuit boards are exactly the same, so no issues there.
I have a mg100hdfx actualy a pair of em but the master volume is very scratchy, would you suggest blowing it out first with aircan or with the suggested servisol can,. I have already got some CONTEC electrical spray lube aerosol but thought it might be a bit thick or the ol' WD40, would you suggest either of these? Oil is an insulator so id have thought maybe not to clean variable carbon resistors with.
its also got noisy fan seems to be endemic with these amps.
I got a four channel amp (prosound) between the mixer (behringer) as someone tld me beter to allow a low gain from seriesing the amps, and then the pair of mg100hdfx amps and theres quite a bit of noise from the mixer when first switched on, possibly input capacitors again?
I dont notice it after it 'warms' up! - though theres no valves.
also the digitech jam man has lost its no 1 slow blues track, is there anybody out there that would be willing to copy their card and post it to me please? ill pay you for a copy if you can do? i found the down load facility on it was slightly faulty and I had to down load each sub routine and 'best guess' patch them together - sort of worked.
but then that pc i was using f'd up and was too dear to replace the disk drives, shame was a toshiba satellite. laptop. so i just use as it is.
regards Frank.
francisjkennedy3@gmail.com.
I would suggest Servisol or any kind if switch cleaner / electrical contact cleaner. You could be on the right track with capacitors. You can test that, let one of your amps warm up then spray any suspect parts with freeze spray. If the noise comes back, that's your bad part. Not sure about the other things. Hopefully someone can help!
Anybody thinking about buying one of these amps by it I got mine for $100 I love it I love it I love!!
Hey there, I was wondering if I could ask you a couple questions? I bought this from a guy who barely used it so he says. The clean channel is really loud even on 1, but the overdrive channel is so quiet, I have to turn the volume practically all the way up. Do you know if that is normal? Also the amp squeels sometimes at high volume and the fan is pretty noisy aswell
The fan bearings can dry out over time, it's really easy to just replace the fan, two wires... The plug off the old fan can be salvaged. That thing with the volumes doesn't sound at all normal. Maybe take a look inside it and see if you can see any capacitors that have bulged and leaked. 9 times out of 10, misbehaving old electronics are just down to bad caps... I found a vid that shows how to spot them - they can look fine but be bad, but most of time they are obvious! Let me know what you find
ua-cam.com/video/cM-mx0_0pss/v-deo.html
@@hydorah okay I'll prob have to have someone look at it. Thank you very much for your input. Much appreciated.