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Amp Internals 2 |
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kedwardsleisure 
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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 Posted: 19 February 2022 at 1:59pm |
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I guess it was good value until it died. Surface mount overheated and burned the pcb so now it's scrap.
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Kevin
North Staffordshire |
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d.antonis
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Joined: 04 January 2009 Location: greece Status: Offline Points: 49 |
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Posted: 19 February 2022 at 5:20pm |
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Nice box and heatsinks for any power amp diy project. Class d for example.
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Andylaser
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Joined: 16 April 2010 Location: Southampton Status: Offline Points: 300 |
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Posted: 20 February 2022 at 3:38am |
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If the tranny is still good, a set of aftermarket mosfet boards woud work well.
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"music so loud, that if we move in next door to you; your lawn will die" - Lemmy
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al_x
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Joined: 12 February 2006 Status: Offline Points: 834 |
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Posted: 11 March 2022 at 9:41am |
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CVR D-3302 54 capacitors on each output board, 18 on the power board. 
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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: 15 March 2022 at 1:43pm |
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Crown/Amcron Powerbase 2 from 1987. Basically a striped-down budget version of the Microtec/Macrotec range. Same hardware, same PCBs, even has the same ODEP board as the Microtecs. In good shape this for 35 years old. All original inside.
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Be seeing you.
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 15 March 2022 at 5:18pm |
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Wow - that is clean. Where has it been used? Home stereo? They are/were quite popular here as a stereo amp for those that wanted a bit more uuumph than the typical hifi amp. |
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Earplugs Are For Wimps!
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Andylaser
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Joined: 16 April 2010 Location: Southampton Status: Offline Points: 300 |
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Posted: 16 March 2022 at 1:39am |
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Thats good. Decent well laid out design.
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"music so loud, that if we move in next door to you; your lawn will die" - Lemmy
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djeddie
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Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Posted: 16 March 2022 at 2:57pm |
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1987 was 35 years ago? Nah. Don't believe you Ian. Surely that was only a couple of months ago! But that Powerbase does look in bloody good condition for that age.
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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imageoven
Old Croc
Joined: 28 March 2007 Location: Scotland Status: Offline Points: 2186 |
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Posted: 17 March 2022 at 9:18pm |
I suspect it wasnt that clean when he aquired it, JBLman seems to be quite well practiced at cleaning and polishing. |
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Keep pushing on, things are gonna get better.
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jbl_man
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Posted: 18 March 2022 at 8:29am |
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Actually it was that clean, as Earplug correctly wondered if it was
being used as home stereo, it actually came from a home-studio. Apart
from a few minor chips and marks to the outside, that is how it arrived.
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Be seeing you.
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 18 March 2022 at 9:01am |
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And back in the 21st century...
Somewhat busy amp module from FBT HiMaxx 40A  
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Kevin
North Staffordshire |
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shaun1264
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Joined: 06 September 2013 Location: Surrey Status: Offline Points: 292 |
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Posted: 19 March 2022 at 12:20pm |
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Another one of Crowns Gerald Stanley's superb invention. A pioneer in amplifier design. Class I design, in very basic terms both high and low side mosfets switch on at the same time and dump the current into the large inductors at idle which cancel each other out so 0V at idle. One side switches on and off faster than other side to pull the sine wave high or low. Negative feedback/ error correction taken at output through a 1;1 transformer. Very high damping factor. Crown K2. This is my third K2 i've re-capped. I can get it done in about 7 hours now. Pic before I started work. All electrolytic capacitors replaced
(except main filter caps) with Panasonic FM and Nichicon PW.
Potentiometers cleaned. Calibrated overlap/underlap and Gaussian
filter for the inherent slight high frequency raise. All put back
together. Load tested far exceeding specs. Distortion below specs. Amp
very stable and sounding very good.  Edited by shaun1264 - 19 March 2022 at 12:22pm |
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Earplug wrote: