Amcron DC300a overhaul. |
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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Could that one possibly going into use on your Hi-Fi Ian
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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Certainly takes me back a bit seeing one in pieces again Ian---I had 28 of the buggers when Slade packed in touring and sold off all the PA gear and they were all in double racks with 4 way fan cooling.
We had to repair a few and I think most of them had seen a soldering iron at least once in their lives---Charlie, Slades FOH engineer used to buy them cheaply in the States and smuggle them back to the UK bolted inside the bands backline cabinets in order to avoid paying duty--Nod was very careful with money back in the day |
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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C'mon John, when's the book coming out?
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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concept-10
Young Croc Joined: 17 May 2016 Status: Offline Points: 1292 |
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Agreed, John you are a gold mine of cool stories, a book is essential :)
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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Its quite funny you mentioning that Eddie as I have started a few topics and got the format sorted while we have been on lockdown---even got the book title sorted now as well(don't ask).
Its going to have to go on the back burner for a while now though as I have just started work on my Mini Cooper S getting it up to 225bhp as I am hoping to be able to use it back on the road later in the summer---Cheers--John. |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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Dont worry about the the Mini Cooper, it's the book we need, you can spill the beans on all the showbiz prima donnas John! Edited to 'Mr.X' in case they sue of course!
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Be seeing you.
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Is that a proper Mini or a BMW John? If it's the former then that's OK, if it's a Beemer then you know the book is the way to go!!
Sorry for hijacking your thread Ian! But, I do refer to these older amps as Helen Mirren's and Joanna Lumley's... maybe old but I'd still have a go and you know they're still gonna work!!! |
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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I would prefer Helen Mirren as the only blow job that you will get from a Crown DC300A is when it goes DC
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Ah, a Beemer then!!!
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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Yeah--As far as I know you cannot get a classic Mini up to 225bhp without putting a Honda engine in it.
Don't knock the Beemers until you have tried one Eddie as they are surprisingly good--Mine is one of the very first ones with the supercharger and drives amazing when it was a standard car but with the mods I am doing, it will be even better. BMW certainly did a good job on these early Cooper S models--they even managed to get them leaking oil and water just like the originals used to |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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Ok...just to give you an update....changed the 2 capcitors around the diode pump, C4 and C5,and also changed 2 out-of-value resistors on the input offset pots. Result is exactly as before,very low,distorted output. Now measuring each side of the resistor (R2) to ground on the diode pump you mentioned,i get 61v one side,81v the other. Have also changed the ua739 ic, incase that was faulty.same result. But output DC is perfect, 0.00v left. 0.01v right. Any ideas from here? |
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Be seeing you.
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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We had a bad batch of DC300As once with very weak and tarnished jack input sockets---I presume you have checked them Ian as it could be a real daft problem.
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