Recent content by Jérôme29

Hi, I found a 4650 in a very good condition, I want to restore it to give him a second life. I already change the double diode in power amp, test the V-fet, they are good I have some questions for people they know this amp, before place my order on mouser, For the filter capacitor I have in...

I finally find my mistake, after checking all the resistors R23;24;25;26 were 330K instead of 330R..... Now with the right resistors everything work perfectly! Thanks to all guys who helped me The 717 are back to life

Hi, today i rechecked all the transistors on the board all fine PNP/NPN and orientation, after that i checked all the resistors (i have changed them) and YES!!! finelly i find my mistake! R23;24;25;26 need to be 330R i put 330K (idiot...) so i changed them and all the voltage came back to...

I checked TR04,08, D02 and TR03,07, D01 they are all good KSC992 ECB in right orientation, anyway i change D01 and D02 with new paire of 1N4148. For the transistor i put the old one 2SA750 (TR07,08) and 2SA726(TR03,04). Powered on the amplifier, everythings good and this time the DC offset...

I keep the old transistors 2sa750 for TR07,08, I can replace them and the same with TR03,04 2sa726

Thanks Hyperion, I will check them! They are brand new ksc992, but maybe they are defective, d2 is a pair of 1N4148, I will change it too

Yes all the deadly glue was removed, That's strange you can see on the picture of the voltage I posted, the +33v, -33v seems to be good approximatively 35v

Hi Ben, I have some issues on my tone control board, I'm not electronicien , I try to follow your post and some other to restore my 717, I take the voltage on F-2720 board and the are not good, I need help to solve this problem

I take all the voltage on the control board and they are not good, very strange

Today I tried to deconect the eq board , and it was the same even worse. The problem come from the tone board (F-2720), I will check allé the part, and disassemble the switch

Hi jd3rdcoast, Yes the issue is the same on every source, and I n the both channels. Unfortunately I don't have an oscilloscope.... But you guide me on the good way I think, for me the tone control is good, I check 4 time, and it probably before, so the EQ board, I will check it tomorrow. For...

Hi jd3rdcoast, Yes the issue is the same on every source, and I n the both channels. Unfortunately I don't have an oscilloscope.... But you guide me on the good way I think, for me the tone control is good, I check 4 time, and it probably before, so the EQ board, I will check it tomorrow. For...

Hi, I need some help from Sansui expert, Yesterday I finished the complete restoration of AU 717, set up bias and DC offset (under 1mv on each channel) I was very happy, so I decide to plug in my dac and speakers, I play music it work but I ear a "ffffffff" noise and it increase when I crank up...

And a photo of the board