Amplifiers Rescue Gods |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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Lyonforge, yuk. If Amstrad made disco amplifiers, this is what it would be like. Doesn't even have a thermal switch?
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Be seeing you.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Online Points: 7199 |
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That's what you'd call a KISS amp! Nice. Only thing is that I would like to see more reservoir caps. Looks a bit short there. What are those, 6800uF? |
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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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EmPro Audio
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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I've seen that on many amps that use those mosfets. Sometimes the leg melts at board level and can burn-out the pcb. I shan't mention any brand names.
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Kevin
North Staffordshire |
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EmPro
Young Croc Joined: 26 June 2020 Status: Offline Points: 766 |
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Playing last evening with my ST1000i i notticed that right ch sounds kinda funny sometimes,like a imperfect contact or faulty pot,so i start to dig the small issue...just to find two mosfets basically with Drains evaporated lol and the amp was paying like that,23mv offset on the ch and 26mv offset on the left ,,good'' one....never saw this before on any amp:
I just ,,broke'' the remains lol and playing the ch like it is,no more funny sounds and the amp runs cool,however i'm going to remove them all ,,14'' and test them individualy to be 100% sure,i still have more than 20 pairs original Hitachi K1058 and J162 so no problem even to replace all 16 :)
Edited by EmPro - 04 January 2024 at 2:37pm |
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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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Btw,anyone have any ideea about the difference betwin ST-i series and ST series?? As i have no ideea and the user manuals doesn't help the specs looks the same,internals look the same maybe the ,,i'' series are capabile 2r? but is not mentioned in the manual,and also the ST1000i already pulls 1kw sinus continuous from 8 pairs of lfet's so in 2r i don't think will manage,unless limited to certain power
Edited by EmPro - 02 January 2024 at 8:08am |
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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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EmPro Audio
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EmPro
Young Croc Joined: 26 June 2020 Status: Offline Points: 766 |
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And the last one for this year,my Studiomaster Mosfet 1000 is ready to play hard i found one of the input cable almost without ground...the HF drivers loves that and one of the two output cables just for decoration so obviously i solved the remaining problems,tested and bias calibrated the amp runs just perfect 👍 unfurtunate the scratched front panel remains the same,anyway the amp will play in rack so...
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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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Thank you so much,i hope i will restore many more amplifiers 🤝 Cheers
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EmPro Audio
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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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Empro, your restorations are magnificent. Looking forward to seeing more in the new year!
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EmPro
Young Croc Joined: 26 June 2020 Status: Offline Points: 766 |
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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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EmPro Audio
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