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marshall jvm: really fucked
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mickie08
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Joined: 14 Aug 2006
Posts: 6160
Location: Carlsbad, Ca

PostPosted: Sun Mar 14, 2021 9:57 pm    Post subject: Reply with quote

dots wrote:
no sweat, mickie, i've dragged my feet on this for years, so it's on me. i will ask, though, did you ever find the slip cover for the head? i left it at that warehouse after strike! Laughing


Never did but I am happy to order one for you. Give us an excuse to break bread and beer.....
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BADmin


Joined: 17 Apr 2006
Posts: 1016358
Location: on the move

PostPosted: Mon Mar 15, 2021 4:38 pm    Post subject: Reply with quote

i'll see if these parts do the trick. and then we can meet up to celebrate/commiserate!
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robroe wrote:
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mickie08
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Joined: 14 Aug 2006
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Location: Carlsbad, Ca

PostPosted: Mon Mar 15, 2021 6:33 pm    Post subject: Reply with quote

sweet. Ill wait to make sure it you get it working then Ill order a cover for it. Still have the vox and prosonic?
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BADmin


Joined: 17 Apr 2006
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PostPosted: Mon Mar 15, 2021 6:55 pm    Post subject: Reply with quote

Yep, havent fired them up recently, tho. That prosonic's overdrive is monstrous!
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robroe wrote:
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mickie08
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Joined: 14 Aug 2006
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Location: Carlsbad, Ca

PostPosted: Mon Mar 15, 2021 7:13 pm    Post subject: Reply with quote

dots wrote:
Yep, havent fired them up recently, tho. That prosonic's overdrive is monstrous!


yep. Great amp
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BADmin


Joined: 17 Apr 2006
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PostPosted: Tue Mar 16, 2021 2:56 pm    Post subject: Reply with quote

the DSP board is only about $25 while the front panel board is about $125ish. it's not the money but the wasted time, and both the guys who replied to my emails strongly recommended taking it to a shop. normally, i might roll the dice, order the parts, and see what happens since the closest repair shop is 90 minutes' drive away, but i happen to be headed that way this weekend and can drop it off on the way home saturday. it's the same place that repaired it for warranty work when the amp was only a couple of years old and hadn't had that many hours on it, so i know they do good work.
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robroe wrote:
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NickS
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Joined: 14 Jan 2008
Posts: 10602
Location: Nr. Basinggrad, UK

PostPosted: Tue Mar 16, 2021 4:19 pm    Post subject: Reply with quote

dots wrote:
the DSP board is only about $25 while the front panel board is about $125ish. it's not the money but the wasted time, and both the guys who replied to my emails strongly recommended taking it to a shop. normally, i might roll the dice, order the parts, and see what happens since the closest repair shop is 90 minutes' drive away, but i happen to be headed that way this weekend and can drop it off on the way home saturday. it's the same place that repaired it for warranty work when the amp was only a couple of years old and hadn't had that many hours on it, so i know they do good work.
It makes me wonder whether I should invest in a couple of DSP boards just to resell in 20 years when you can't get them from Marshall...
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BADmin


Joined: 17 Apr 2006
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PostPosted: Tue Mar 16, 2021 4:29 pm    Post subject: Reply with quote

probably not a bad idea! i have no idea how long they crank out those types of parts or if they're used in other models.
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NickS
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Joined: 14 Jan 2008
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Location: Nr. Basinggrad, UK

PostPosted: Tue Mar 16, 2021 8:52 pm    Post subject: Reply with quote

The major issue with maintenance of microelectronics like DSPs is there tend to be newer, better ones coming along all the time and the old ones become obsolete and unavailable, like the Analog Devices ADSP-2115 that used to be in various sound cards.
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BADmin


Joined: 17 Apr 2006
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Location: on the move

PostPosted: Tue Mar 16, 2021 10:01 pm    Post subject: Reply with quote

yep, and once it was identified what that "4 inch board" did, it became suspicious to me that the DSP would be the issue. it's not like reverb is what's broken, and i rarely use that anyway. the problem is the amp just stop pushing out sound completely and doesn't come back until you turn it off/on. mind, i'm no circuit bender, so maybe there's something i don't know enough about how the signal is being routed and that a malfunction of the DSP could bring the whole thing to halt. nfc.
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robroe wrote:
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BADmin


Joined: 17 Apr 2006
Posts: 1016358
Location: on the move

PostPosted: Mon Mar 22, 2021 2:47 pm    Post subject: Reply with quote

stopped by music mike's on saturday only to find they had moved shop across the street to the giant outdoor mall. put the amp back in the car, drove over, then dragged the amp into the new location only to find that the marshall tech retired at the beginning of the year, and the shop had no plans to replace him. the clerk on duty gave me a handwritten name and number ("texts work much better") for contacting a "local guy" they could recommend. since that situation was pretty much the same i had in my own town, i thanked them and dragged the jvm back to the car. Mad

the next closest is up on orange county on main st (not far from disneyland lol). another day trip is in my future.
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