After two months of hard work finish the project ARCAM amplifier FMJ 32
It started amp burn by faulty diode that burned power transistor and some components This project encountered any problem is possible, DC FOSET Overload Plus But the end Successful I changed the amp about 70 components
Electrolyte capacitors all recipients to RUBYCON-ZLK
film capacitors replaced
VISHAY 1837MKP
VISHAY 1813MKT
LCR CAPACITOR
10000UF filter capacitors of BHC Replaced by capacitors of MUNDORF 15000UF
All the SMD resistors main tracks were replaced with the SMD resistors of VISHAY DALE Thin film resistor 0.1% TCR 25PPM°C (I replaced approximately 40 SMD 1206 resistors )
And the thru hole CF resistors cange to film resistors ( bootstrap and output ) VISHAY DALE 2W - 0.1% VISHAY BC 2W - 5% .1%
Variable Resistors 100 OHM of the bios Resistors were replaced with 25 turns resistor of
and Some burn fmmt497 transistor Also replaced and burn bas 16w diode Also replaced
I learned so much from this project As Middle Ages I found out that notebook and pencil subtle uses circuit analysis After BIOS calibration the amp works perfectly and sounds a hundred times better as before
The most significant improvement is the dynamic Musical instruments such as the piano sounds much better especially in the lower octaves . Musical instruments such as acoustic guitar subtleties of Slade are delivered perfectly .
The DC voltage on the speakers output is very low 1 to 3 milli volts
Amp currently connected to another DIY project of my DENON DVD 3910 And speakers B&W 804 And I am very pleased with the result
diyAudio
