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it's too optimistic, in fact, your rail will drop from 48V to 23V and less during 1/10S even if the load is 2ch 4ohm. For instance, Pro audio standard power rollback is 2S, that's enough in the most case of music content but this is a far away not HiFi, it is compromising approach for musicians and stage. Your setup is 20 times worse( 2S/.1S = 20), the power drops 6 times first 200mS, does exist any reason to not use a decent SMPS?
 

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Yeah, as usual, but you have a second option - a lot of alcaps for averaging the current ripples. For example, in my HiFi TOY design I've no room for a big caps tank, hence, I going with over-beefy SMPS mosfets (22A when <=10A looks more reasonable by a first glance).
PS: actually, Hypex SMPS is an audio product so its 35V would be MUCH more than your 48V with industrial SMPS.
 
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New life for 70's Kustom X-strereo Power Amp

A friend had this amp in his shed for many years , only one channel was working ,and a few weeks ago that also gone up in smoke . No more music in the shed during our Friday afternoon happy hour :sad:
I had a look at it and both power amp boards were totally fried .
I replaced them with 2 L15D pro's and put in a new PSU board with 20.000 MicroF per rail .
Only original PCB is the input buffer / volume control and overload indicator .
Sounds great again ! 40 US$ for 2 amps :nod:

Cheers ,

Rens
 

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Nice one Rens! What did you use for the PSU board?
Thanks Jon ,

I used this one : Assembeld Power supply board 4pcs NOVER 10000uf/50V Capacitors for amplifier | eBay
I can recommend this seller , very reliable and fast shipping , took only 11 days between ordering and receiving in Australia
Cheap , but well build ,Only 50V ( not the best )capacitors , but amps work on +/- 43V so no problems here .Remember this is a shed amp with 2 large 2x12"+ piezo's 4 ohm PA speakers :)
No clicks , Pops , Hum or noise and voltage is stable thanks to the large capacitors even at 2 x 100w 20Hz . clips around 140 watts in 4ohm

Cheers ,

Rens