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Crown Macrotech 3600 vz fan
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jbl_man View Drop Down
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Joined: 12 January 2005
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Points: 11155 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 03 December 2018 at 8:48am
Crown had the daft idea of using the fan motor windings to provide the low voltage AC for the main board Gaz,so it's really a fan-former....seem to remember Dansette doing something similar on their record players in the 1960's,using the motor as a transformer. Really stupid idea on an amplifier that retailed at £1500.
Be seeing you.
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Points: 2433 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GAZ. Quote  Post ReplyReply Direct Link To This Post Posted: 03 December 2018 at 9:51am
Ah ok. I assumed there must be a reason. I remember my first record player being like that, idler drive mains motor with low voltage output on it for the amplifier.
Presumably there’s no other way of getting round the problem fitting a separate small transformer and different fan?
100% Earth Moving Bass
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Points: 11155 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 03 December 2018 at 11:33am
Anything is possible, the central deck mounting hole diameter is about 4 inches,so if an adapter baffle could be made to fit a 100mm Papst type mains fan, problem being a standard square-framed fan wont fit,as it will foul other power supply PCB's.....so the fan needs to be in a round frame....then a separate LV transformer to run the main board,and modify all the wiring accordingly.....not exactly a 5-minute job!

So you can see a genuine working fan is at a premium.
Be seeing you.
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Points: 7216 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 03 December 2018 at 12:34pm
I once did do a mod on a Microtech I had - adding an O/P protection board. The Micros had (have?) a bad rep for going DC & destroying drivers, so I managed to fit a small transformer & relay board in the thing.

FWIR, there was plenty of room in there to do that, so another type of fan & transformer should be a possibility - but, as you say, not a quick job.
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Points: 7216 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2018 at 6:42pm
Ok, just spoken to the guy with the (spare) Amcrons. He´s going to check if any of the fans work and get back to me.

Let you know.
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catalin View Drop Down
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Thank you everyone for the input,appreciated
Earplug,keep in touch!!
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote catalin Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 9:18am
Fan sorted,thank you Earplug!!Thumbs Up
Now,a main PCB needed!!
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Points: 7216 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 6:23pm
No problem!  Smile
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catalin View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote catalin Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 8:24am
Up!!
Main PCB needed!
ThanksSmile!
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote catalin Quote  Post ReplyReply Direct Link To This Post Posted: 01 January 2019 at 11:38am
Happy new year everyone!!

Main PCB steel neededSmile!

Thanks
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote catalin Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2019 at 8:02am
Bump!!
Still needed,main PCB!!
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote catalin Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2019 at 7:21am
Up!!
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