gres
Full Member level 4
Boards are based on Flodins project
Assumptions: i wanted to make something better than amplifiers that i already had ( mainly unitra manufacture). I also wanted to make preamplifier nr3 from audiotron.
Elements: resistors 1% metalize, condensers nichicon, some styroflex, WIMA, OnSemi transistors, Toschiba ( biggest one) and Fairchild. In amplifier LCR condensers (great quality for that price), transformer is Indel TS300, 2 simple rectify bridges (you don't need fast diodes, because it is not chopper power supply).
Additionally to power the pinwheel and DC safety system, and temperature I gave TS8
Casing: simple spruce box from Castorama with 700m wide, cut for right dimensions and stained ( shame to admit but for long time i was thinking how to make nice casing, and finally I found some project at the internet. Sheet metal plates are bottom side of two correctors FSO42 (very cheap ). Power slots and in/out puts are placed on cam relieved aluminum flat bar ( also from castorama)
Amplifier started without any problems. When I was constructing device, I ordered 4 boards. One pair i made on low quality elements, second with better one. There is really big diffrence in sound (I found that diffrence at Zg40C)
Sound is really good so i hope it will work fine for a few years. Secure system is copied from radmor 5412
Unfortunattly radiator seems to be too small and i need to cool system by pinwheel. I think i will use softstart because there is strong jerk at start. And top cover will be black.
original text is here https://www.elektroda.pl/rtvforum/topic1530703.html