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Amplifiers Rescue Gods |
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EmPro 
Young Croc 
Joined: 26 June 2020 Status: Offline Points: 766 |
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 Posted: 09 June 2023 at 11:21am |
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I've seen in some photos on the internet that indeed they had some black covers on the outputs...looks nice to have those as well but this one has none of them,and i'm pretty sure i won't find them anymore
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EmPro Audio
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jbl_man
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Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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Posted: 09 June 2023 at 11:27am |
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Thanks Kevin, yup, that's the ones. |
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Be seeing you.
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 09 June 2023 at 11:36am |
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lol,search results on ebay uk for: to3 transistor cover:
 I didn't expected to be honest,and cheap as hell
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EmPro Audio
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 09 June 2023 at 11:43am |
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Back to the amp,this is the specs from the Jbl_Man's linck:
 It is written that is dissipation limited...but for the love of god i don't see any thermal tracking of the outputs..so it cannot be limited...basicaly if you squize the life out of it in low impedance should blow due to thermal runnaway or just go off as the thermal relays will kick in...but no way of limiting...
Edited by EmPro - 09 June 2023 at 11:44am |
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EmPro Audio
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jbl_man
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Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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Posted: 09 June 2023 at 12:26pm |
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.....yup, just relies on the mechanical circuit breaker of the thermal switch to 'limit' it. Bear in mind, the early ones didn't even have that.
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 09 June 2023 at 12:37pm |
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My god,how people didn't blow them up?! I mean the're just 2 pairs of outputs per ch rated at 150w each and the power continuous of 235w from them seems marginal already...
 Edited by EmPro - 09 June 2023 at 12:38pm |
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EmPro Audio
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kedwardsleisure
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 09 June 2023 at 1:40pm |
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people learned not to drive them so hard when the result was the sound switched off for the rest of the gig until the amps cooled down
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Kevin
North Staffordshire |
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 09 June 2023 at 1:50pm |
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"I didn't expected to be honest,and cheap as hell" Definitely worth fitting. Avoid those silly accidents!  |
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Earplugs Are For Wimps!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 09 June 2023 at 1:54pm |
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i was expecting that,and i only imagine what happened with those who didn't have the thermal relay switch fitted |
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EmPro Audio
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 09 June 2023 at 1:58pm |
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I'll definitely fit those covers,not so much for the accidents,but for the design as well,those outputs might be perfectly working,but they look like crap
 Edited by EmPro - 09 June 2023 at 1:59pm |
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EmPro Audio
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 09 June 2023 at 2:02pm |
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Also i'm still thinking to replace all of them with MJ15022....
any advice?!? There is a guy on Ebay selling original MJ15022 from SemeLab,i did mention them before here,proper outputs and only 3£ for one,also..i don't think are matched devices...just some NOS...so i might be better with the matched 2N-s
Edited by EmPro - 09 June 2023 at 2:06pm |
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EmPro Audio
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jbl_man
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Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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Posted: 09 June 2023 at 2:24pm |
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If they aint broke, dont fix 'em. Just clean up the old ones, if they all measure ok, pop them back in. I had my MMs for over twenty five years, still working perfectly when i got rid of them, all original components.
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kedwardsleisure wrote: