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Hello y'all,

I've been having a problem with JVM 205Combo.
During corona-lockdown, when we were not allowed to rehearse with the band, I had took my amp home with me....
As I'm always curious to find other sounds, I started experimenting with connecting other speaker cabs to my JVM. But, as I later discovered, the cable I used was no good and I think I blew up the main amplifier. I looked for the fuse, for it seemed logical to me that the fuse was blown, but couldn't find it. I also have a JCM 800 2205 head, a JMP MK2 2204 head and I've been having a JCM900 4100 head in the past. Now, all these amps were fused, so if anything went wrong, it was just the fuse that was blown. In fact, I've experienced that!
But no fuse on the JVM....is that correct? Because if it is, my problem is bigger than I thought. In that case, what was blown instead? The output transformer? My tubes?

I hope somebody can help me out on this one. And I promise never to experiment with other speakers or whatsoever.

Thnx anyway!
Cheers!

 

asked 10 Sep 2021 at 08:23 PM

Arno Visser
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741

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Hey everyone, 

 

So I've had my dsl 40c for awhile now and I absolutely love it.  However, One small issue came up awhile and i could use some help tracking down the right part. A couple weeks ago one of the fuses blew in the amp head, and after going to severa music stores,  hardware stores, home depot,  even automotive stores, i cannot find the right exact fuse for the amp. They're all 500ma, which are pretty common, but if you get one from a hardware store it just blows again immediately, because as I've noticed, the fuses that came in the amp have a thicker wire than anything I can find. Even having trouble locating the right ones online and there is absolutely NOTHING in the way of fuses on sweetwater, if anyone has any idea on how I can track down the right fuse, it would be greatly appreciated! 

asked 13 Jan 2020 at 01:51 AM

Darren Graham
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1

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It won't power up when switched on; no signs of life at all. It worked fine at a gig and then when I got it home, it wouldn't switch on.I s there a fuse inside the cabinet? I've replaced the fuse in the plug, but that hasn't helped. 

asked 24 Jul 2019 at 03:41 PM

Robert Campbell
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Hey Mates,

 

Having issues with a clients amp, seems that after a retube that i did, he was playing and after about 30 min, it gradually started losing sound and then cut sound completely.  I did the re-tube myself, and biased it properly and i was able to play it for about 40 min with absolutely no issues.  List of troubleshooting steps i have done:

tried a different speaker cable

tried a different guitar cabinet

tried a different guitar and guitar cable

tried the old tubes, additionally bought a 12ax7 and tested each pre-amp tube

tried a different power source

Have tried different power tubes

have checked and replaced the fuses

 

Now this is what i am THINKING is the problem, I think it might be something with either the heater curcuit fuse, or i think it's called a BRT1 Rectifier?  I did alot of research and it seems that the people having MY issue, explain the same symptoms of what i am having.

 

Now i have to make this clear, I AM NOT A PROFESSIONAL TECH, just a guy helping bands out with tech stuff that they don't know how to do.  So any help is appreciated.

 

Thanks!

asked 27 Jun 2019 at 08:01 PM

Austin Hetrick
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My J60 tube amp made a loud POP while jamming. All the tubes are secure and lit up, and the fuse still looks good. The amp isn’t making any sound at all though. Any suggestions on what might be the problem?

asked 21 Mar 2019 at 12:43 PM

Zachary Daniels
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1

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554

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HI,

I'm touring for over 20 years and I usually take care of my amps by myself as I don't always have the time to let my amps at a service center when something goes wrong

Recently I have replaxe my old 100W Plexi and JCM800 with smaller amps, and I take a 1974X and a Mini Jubilee 2525C 25W Combo on the road.

I have notice from some photos online that there is 3 or 4 fuses installed ion the main circuit board of the 2525C and would like to know what are the value of these fuses.

I don't want to open the amp just to take a look but it's good to have a few on hands just in case something goes wrong!

Would it be possible to know the value of theses fuses that are located on the circuit board, for an Canadian 120v version of that amp?

Thanks in advance!

asked 23 Jan 2019 at 03:16 AM

Stephane Ouellette
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0

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945

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Hello,
Can you please help me figure out why my Woburn speaker keeps on blowing fuses?

I’d like to know if there is anything I can do to protect it from blowing again and again?
(the speaker is only a few months old and had very little use. I wonder if it’s defective or maybe there is something wrong  with its placement / location / nearness of other electricity products / unstable socket)by the way, I always use the correct fuse (1.6A).

Much appreciation for your help!
thanks,
Ronen

asked 17 Feb 2018 at 08:54 PM

Ronen Uliel
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3

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2.5k

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hello,

i’d Like to know which fuse is the proper one to replace on my Woburn speaker?

and by the way, what can cause this problem...?

(can it be affected by near electrical products or a bad/defective wall socket?)

thanks:)

Ronen

asked 03 Feb 2018 at 11:07 PM

Ronen Uliel
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2

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2.6k

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I have looked for a definite answer to this and have not found one. I played my amp the other night with no problems, but last night as I turned on the amp it just died on me as soon as I turned the standby off. There was no noise, pops, crackles, fizzes. It just turned off. I checked the main fuse and it was blown. I have not had any issues with tubes and they have not shown any signs of wearing out. I made sure my amp was connected to the cab correctly (remember i have had this rig for 8 years) and that I had a speaker cable rather than a guitar cable.  I found online there could be issues with impedence and what not. I took the back off of my cab and noticed that a positive lead on one of my v30's became disconnected.  I thought, 'Could it be?" So I reconnected it and replaced the fuse and the amp worked as advertised. I played for an hour or so and no problems yet. Could it be that the discoonnected positive lead on one speaker caused it to blow a main fuse?

asked 11 Apr 2017 at 03:11 PM

David Bradley
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1

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730

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What year was it made , i bought it from Halwani Audio in Jeddah in 1990 or 1991 i think , 

Used in a semi pro band from Saudi , Oman and now UAE , 

Channel 1 still going strong

channel 2 now caused output fuses 2 , to blow ( Dirty Channel)

Never been retubed , but now its time , never really played too much.

Regards , Kieran

 

asked 04 Apr 2017 at 01:03 PM

Kieran Hughes
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1

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899

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Hello, i bouth this amplifer a few months ago and already have problems.. i did not expect it from an amplifier of this prestige.

The amplifier used several times configured for 220 volts without any problem, but yesterday i turned it on and did not turn on the pilot and nor made any noise... is dead!!!

i check the fuses and saw that the mains fuse was blows, change it for an identical value and returned to blow.

how can this happen in a new and boutique amp?

 According to the page of marshall the problem would be for faulty valve or within the power supply. ....I can not believe it!!!!

please help!!!!!

Gonzalo Arriagada

asked 02 Mar 2017 at 08:36 PM

Gonzalo Arriagada Carrasco
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