Amp Internals 2 |
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M4trix
Registered User Joined: 23 June 2009 Location: Croatia Status: Offline Points: 445 |
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@Kevin, do you first inspect the amplifiers for spiders, scorpions before you put your hands in it ? It looks like a terrarium for such nasty bugs.
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1103 |
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The only irritating bit of these are the hybrid driver circuit, when they go wrong just bin the amplifier.
There was a long time ago an engineer who copied the Citronic hybrid circuit and designed a PCB which was a copy of the original but using surface mount components, don't know if they are still available. |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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No poisonous animals of any kind in the UK! Snide political comments aside....
A&J Audio Edited by kedwardsleisure - 11 August 2020 at 10:24pm |
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Kevin
North Staffordshire |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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Is this a Buz mosfet thing? Must have been one of the very last of the UK amps?
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Be seeing you.
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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no it's bipolar, MJ15003/MJ15004. All working now, though nothing to brag about!
The thick film hybrids were a bit of a fad across the industry a few years ago, I remember the early QSC step drivers and housekeeping modules were like that before they reverted to conventional construction, I've also seen them in AKG radio mics where if you drop the mic, the ceramic tile shatters. Sprint speed controllers had them but they reverted to a standard pcb. Siemens used them in industrial robot controllers. AVO used them in their late-model AVO-8 where they could be calibrated by etching the carbon film resistors 'live' (I think precision SMT resistors are made ina similar way, if you look under a glass you can often see a little slot burned part-way through). I've only seen the Citronic ones in the last generation of uk amps, the PPX Conquest had them and I've had them fail after a blow-up, though you can often repair them. Edited by kedwardsleisure - 12 August 2020 at 2:34pm |
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Kevin
North Staffordshire |
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kipman725
Registered User Joined: 02 September 2020 Location: Warrington Status: Offline Points: 231 |
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Crown Macrotech MA5002VZ. Came to me in a bit of a mess so far I have got one channel working (final image). No idea how the internal cable routing is meant to work to avoid them contacting the fan blades as it had already been messed with when it got to me. Signal lights are weird in that if there is a high level of distortion (such as broken output) they will light up fully with no signal. https://ibb.co/0X7014Q - https://imgbb.com/ - img hosting https://ibb.co/j44Z9MJ - https://imgbb.com/ - img hosting https://ibb.co/Y2nK3dQ - https://imgbb.com/ - img hosting https://ibb.co/DfHJfGW - https://imgbb.com/ - img hosting https://ibb.co/zFZ9cqC -
https://imgbb.com/ - img hosting |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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a mate of mine has cushion covers that match your curtains
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Kevin
North Staffordshire |
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Rareun
New Member Joined: 12 November 2020 Location: Devon Status: Offline Points: 3 |
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Sorry, new to this and I think I may have posted this same question 3 times now but is it true that there's only 20 of these? I have 2 of them
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knet94
Old Croc Joined: 31 March 2008 Location: NW London Status: Offline Points: 1509 |
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Can't work out what you're referring to.
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Online Points: 7441 |
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yeah.. there's over 200 pages of stuff here.. hit quote rather than reply maybe
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Rareun
New Member Joined: 12 November 2020 Location: Devon Status: Offline Points: 3 |
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Hi this was the quote I was referring to. Are they really this rare? I have 2 of them |
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Rareun
New Member Joined: 12 November 2020 Location: Devon Status: Offline Points: 3 |
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MkII that is
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