Marshall Plexi Problem...help!?

Messiah · 18th April 2006

Every time I replace the mains fuse (T2A) on my 50 watt Plexi reissue and switch it on, it lights up for 1-2 seconds then blows the fuse.

Does this sound familiar to anyone?

Is there anything I can try before I send it out to get checked out?

I hate being without it!

deeewight · 18th April 2006

same thing happened here..kept thinkingit was different things..turned out to bethe tube sockets....have them check those first

Dwight

peeceebee · 18th April 2006

You've golt a short or close to short in the b+ circuitry- DEFINITELY get it fixed before trying to use the amp further(!)

Tetness · 18th April 2006

It happened to my with my '69 plexi superbass. Get it checked out by expert. Too nice of an amp to be (&*ing around with unless you really know you're stuff.

sismofyt · 18th April 2006

most likely a dead B+ cap. any semi competent tech can replace it, just get a cap with the same yF/V preferably a better quality. no need to contact marshall to get it, try:

http://www.tubesandmore.com/

nikki-k · 18th April 2006

Hi!
Could also try here:
http://www.marshallampforum.com/forum/

or here (this one seems ot have more "tech heads" hangin out):
http://www.vintageamps.com/plexiboard/index.php

And one more place:
http://www.metroamp.com/forum/

T9c · 18th April 2006

Quote:

Originally Posted by sismofyt

most likely a dead B+ cap. any semi competent tech can replace it, just get a cap with the same yF/V preferably a better quality. no need to contact marshall to get it, try:

http://www.tubesandmore.com/

I've repaired hundreds of Marshall tube amps and rarely is there a shorted cap of any kind. But there are just too many things that can be wrong to be guessing before a tech sees it. Definately take 'er to an amp repair tech. They'll find the problem.

Rick

Messiah · 18th April 2006

thanks for the advice guys!

A trip to the man it is then...

Sounds Great · 19th April 2006

My JMP50 was cutting in and out and just humming when it cut out. I just brought it in and had new tubes put in and a full tune up. Turns out there was a bad tube socket that they replaced, I think it was shorting out. Sounds like a million bucks again.

pendejo · 19th April 2006

If it has a rectifier tube, try replacing that first.

18th April 2006	#1
Messiah Lives for gear Joined: Dec 2002 Location: North West Coast, UK. Posts: 603 Thread Starter	Marshall Plexi Problem...help!? Every time I replace the mains fuse (T2A) on my 50 watt Plexi reissue and switch it on, it lights up for 1-2 seconds then blows the fuse. Does this sound familiar to anyone? Is there anything I can try before I send it out to get checked out? I hate being without it! __________________ Best Regards, Carl.

18th April 2006	#4
Tetness Lives for gear Joined: Jan 2004 Location: Hollywood Posts: 1,573	It happened to my with my '69 plexi superbass. Get it checked out by expert. Too nice of an amp to be (&ing around with unless you really know you're stuff. __________________ Barefoot Recording Monitors*

18th April 2006	#6
nikki-k Lives for gear Joined: Mar 2004 Location: PDX Posts: 539	Hi! Could also try here: http://www.marshallampforum.com/forum/ or here (this one seems ot have more "tech heads" hangin out): http://www.vintageamps.com/plexiboard/index.php And one more place: http://www.metroamp.com/forum/ __________________ nikki k

19th April 2006	#9
Sounds Great Gear Guru Joined: Jan 2005 Location: Twin Cities, MN Posts: 15,303 1 Review written	My JMP50 was cutting in and out and just humming when it cut out. I just brought it in and had new tubes put in and a full tune up. Turns out there was a bad tube socket that they replaced, I think it was shorting out. Sounds like a million bucks again. __________________ http://soundcloud.com/sounds-great-1 -Rob And these children that you spit on As they try to change their worlds Are immune to your consultations They're quite aware of what they're going through

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

18th April 2006	#2
deeewight Gear interested Joined: Dec 2004 Location: Austin Posts: 22	same thing happened here..kept thinkingit was different things..turned out to bethe tube sockets....have them check those first Dwight

18th April 2006	#3
peeceebee Gear addict Joined: May 2005 Posts: 323	You've golt a short or close to short in the b+ circuitry- DEFINITELY get it fixed before trying to use the amp further(!)

18th April 2006	#5
sismofyt Gear nut Joined: Sep 2004 Location: Aros Posts: 88	most likely a dead B+ cap. any semi competent tech can replace it, just get a cap with the same yF/V preferably a better quality. no need to contact marshall to get it, try: http://www.tubesandmore.com/

18th April 2006	#8
Messiah Lives for gear Joined: Dec 2002 Location: North West Coast, UK. Posts: 603 Thread Starter	thanks for the advice guys! A trip to the man it is then...

19th April 2006	#10
pendejo Gear maniac Joined: Sep 2004 Location: Marbella, Spain Posts: 239	If it has a rectifier tube, try replacing that first.

Similar Threads
Thread	Thread starter	Forum	Replies	Last Post
Marshall Mod to 1967"Plexi" JTM100 PA Head	deda	So much gear, so little time!	4	10th May 2005 08:41 PM