F50 Combo crackling issue

F-30, 50 and 100's

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acdcdas
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F50 Combo crackling issue

Post by acdcdas » Sat Nov 23, 2013 4:53 pm

Hi guys, I'm new to the forum but not to mesa boogie.
Today i bought a second hand F50 as i was looking to downsize to a smaller amp.
I was told it had been serviced and had just had new valves. I looked and can see they are JJs.
Unfortunately when i turned the amp on within about 5 or 6 seconds i could hear noise on both channels.
Theres a hum and a crackling and popping. I assumed it might be the valves but they are all in secure and are lit up.
I also notice when i touch the front panel or the metal on the handle it pops. I guess there might be an earth issue.
Does anyone reckon this could happen in transit or do you think i am being conned by the seller as he insists that it made no noise before it left.


Love to get this sorted as i can't wait to test it out in a band environment!

Cheers for any help or advise

Tom

Monsta-Tone
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Re: F50 Combo crackling issue

Post by Monsta-Tone » Fri Jan 10, 2014 10:26 am

Hey Tom,
Not sure if you got this sorted out.

It definitely sounds like something is loose. When I saw the title of your thread, I thought it might be loose or dirty tube sockets, but if you touch the handle and it makes noise.......
Did you ever get it taken care of?
Elvis said.......
Amp techs do get shocked. :shock:

acdcdas
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Re: F50 Combo crackling issue

Post by acdcdas » Sun Apr 16, 2017 3:01 pm

Hi, thought i might try to get on top of this issue again.
After my original post i took it into be looked at and they had it a week and didn't find anything wrong.
Very frustrating but iv'e been using it on and off in practice for a few years now.

Ive not noticed so much popping, but there is one main issue. After a while of playing, the volume will drop on the clean channel and get a little dirty.
Ive changed the valves countless amount of times and this still happens. Ive just got used it to and turned it off for a while then used it again but id love to get this dealt with if anyone has a vague idea what it could be?

Cheers
Tom

paul461
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Re: F50 Combo crackling issue

Post by paul461 » Fri Apr 21, 2017 8:27 am

Not sure if this will help...but I have a noise issue with my F50 at home but not at gigs..the reverb in my amp doesn't like the electric at home..it can pop a little etc..no volume loss just noise. I run a TC Hall of fame because of it.
PRS Custom 24 - PRS CE 22 - SVL 61 Reserve Stratocaster with SVL 59 Reserves - Fender 57 Reissue Strat with SVL 59 Reserves - Lowden O23 - Lowden F32cx - Takamine TNV 460SC - Tokai LSF 100 Les Paul - Levinson Blade Strat - Mesa/Boogie F50.

acdcdas
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Re: F50 Combo crackling issue

Post by acdcdas » Fri Apr 21, 2017 10:43 am

Cheers Paul

The popping seems ok now, so you are probably right, it as something to do with where i tested it.
I changed the 6l6 valves for Sovtecs and as the amp warmed up the valves blew the fuse.
I got replacement fuses (1amp as it says to use) and they blew straight away with both sets of valves.
One set worked for a while with my original JJs in but blew as i turned the amp off.
I compared the old fuse and noticed it was a 25amp fuse. I guess this isn't a good thing.

Anyone have any idea or a decent repair place in south london?

Cheers
Tom

paul461
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Re: F50 Combo crackling issue

Post by paul461 » Sat Apr 22, 2017 9:12 am

You could ask for amp repair advice in GuitarGuitar etc..the staff are bound to know who's available in that area.
PRS Custom 24 - PRS CE 22 - SVL 61 Reserve Stratocaster with SVL 59 Reserves - Fender 57 Reissue Strat with SVL 59 Reserves - Lowden O23 - Lowden F32cx - Takamine TNV 460SC - Tokai LSF 100 Les Paul - Levinson Blade Strat - Mesa/Boogie F50.

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