I know next to nothing about electronics, but like watching a true professional do the kind of work I would if I could. Thanks for sharing your skills.
I am so glad you are doing this video! I have the excact same amp. How it wounded up here in Denmark I don't know. I have had it for a view years now and restored it back in the time. I didn't check those blue caps though, because, like you, I assumed they should be fine. I have checked them today, and they are not fine, so thank you for pointing that out. I use my Onkyo with a transformer 220/110 volts and that seems to work fine. I have 33V on the rails before clipping and 40 in idle. I am looking forward to the point where you have to determine the bias. I have 6mV on the to outer terminals where it says "Check". Sinus looks wonderful on the scope, no crossover distortion. I get a max wattage of 38.72 Watt. Hope this help a litlle. Looking forward to part II.
Good to hear you found the video useful. Those caps should have never failed since the see very little voltage. Also, thanks for the info. I don't know what the idling current should be but now I have a idea
Thank you, I had similar trouble with my receiver left channel phono. Couple cracked cold solders and a failing cap. Was so happy some part made of unobtainium hadn't failed. Have a great week.
Never owned an Oinkyo 🐷 til recently. A8067 from late 80’s I believe. In the middle of going through it right now but initial power test and some early listening sessions raised my eyebrows. That machine is a beautiful example of an early A! Excited for the nest episode and thanks Trevor
Although I’ve heard of the Onkyo brand, I don’t remember seeing it commonly in stores here in SoCal…or maybe I just wasn’t paying attention because I was interested in so many others at the time. Let’s get to part two!
Learning something new,I have seen the black legs on some transistors,in circuit of an amp a guy gave me,ages ago,but haven't had the time to work on it.I didn't know that was a thing. Great work looking forward to next video.
35:52. YOU DO NEED A 250V CAP TO PASS AN AUDIO SIGNAL. BECAUSE THATS WHY SABSUI HAS AN AUDIO SIGNATURE. I ACTUALLY USE 600V CAPS. BUT. IF YOU USE A LOWER VOLTAGE CAP THE SOUBD GETS COLDER.
It's a to-92 transistor If you increase the primary side volts by about 12 Volts AC RMS (122volts RMS) , you might get another 5 watts per channel on the output because I don't think the voltage would be much more on the secondary side. This is because of the transformers turns ratio and the amount of energy stored in the core material I would also think that if you increased the voltage to American line voltage , the power factor would be better and the power would go down due to the inductive load Why are you not doing signal injection on the actual phono board ? You should have done the signal path from the start ! replace the capacitor on each side !
Yeah, cursed. I've been working on a Sony TC-350 R2R that is just that. Every time I fix a problem something else rears its ugly head and sends me back to my bench. I've determined that its not worth the time I'm putting into it so its now a parts unit. Cursed no more. 😇
Nice production Trevor, whenever I do not recognize something, then always a Japanese import. Early 1970's just too many defective electronic parts manufactured, 1976-1979 for me. Ill remember those Blue Hitachi Caps.
I know next to nothing about electronics, but like watching a true professional do the kind of work I would if I could. Thanks for sharing your skills.
I have never seen a rash of failed film caps like that, very unusual. Good luck with the Marantz, thanks for sharing Trevor.
I am so glad you are doing this video! I have the excact same amp. How it wounded up here in Denmark I don't know.
I have had it for a view years now and restored it back in the time. I didn't check those blue caps though, because, like you, I assumed they should be fine. I have checked them today, and they are not fine, so thank you for pointing that out.
I use my Onkyo with a transformer 220/110 volts and that seems to work fine. I have 33V on the rails before clipping and 40 in idle.
I am looking forward to the point where you have to determine the bias. I have 6mV on the to outer terminals where it says "Check". Sinus looks wonderful on the scope, no crossover distortion. I get a max wattage of 38.72 Watt. Hope this help a litlle. Looking forward to part II.
Good to hear you found the video useful. Those caps should have never failed since the see very little voltage.
Also, thanks for the info. I don't know what the idling current should be but now I have a idea
Thank you, I had similar trouble with my receiver left channel phono. Couple cracked cold solders and a failing cap. Was so happy some part made of unobtainium hadn't failed. Have a great week.
Never owned an Oinkyo 🐷 til recently. A8067 from late 80’s I believe. In the middle of going through it right now but initial power test and some early listening sessions raised my eyebrows. That machine is a beautiful example of an early A! Excited for the nest episode and thanks Trevor
I don't mind the "To be continued" ending of these videos.
Looking forward to the "Previously on 'Trevor's bench'" in the next episode 😊
Although I’ve heard of the Onkyo brand, I don’t remember seeing it commonly in stores here in SoCal…or maybe I just wasn’t paying attention because I was interested in so many others at the time. Let’s get to part two!
Very well done thanks for making it
Learning something new,I have seen the black legs on some transistors,in circuit of an amp a guy gave me,ages ago,but haven't had the time to work on it.I didn't know that was a thing.
Great work looking forward to next video.
i was surprised that one poly film capacitor was bad.
You were just lucky to win the jack pot lol.
Repairing things can send you mad.. ok madder :-D
Already tuned!
Those Kemet R82s...Long legged DQ,CK,Z3 codes aren't available anymore? Neat Onkyo to work on. Interesting catch on those blue mylars. Thanks Trevor!
this amp reminds me of the old fisher amp nice amp.
That must be a bad batch of caps. Quality Control sure fell on its arse, that day!
35:52. YOU DO NEED A 250V CAP TO PASS AN AUDIO SIGNAL. BECAUSE THATS WHY SABSUI HAS AN AUDIO SIGNATURE. I ACTUALLY USE 600V CAPS. BUT. IF YOU USE A LOWER VOLTAGE CAP THE SOUBD GETS COLDER.
I had no idea Onkyo had such pretty looking heritage. Were these made in Japan?
Never mind! Got to the 5 minute mark
It's a to-92 transistor If you increase the primary side volts by about 12 Volts AC RMS (122volts RMS) , you might get another 5 watts per channel on the output because I don't think the voltage would be much more on the secondary side. This is because of the transformers turns ratio and the amount of energy stored in the core material I would also think that if you increased the voltage to American line voltage , the power factor would be better and the power would go down due to the inductive load Why are you not doing signal injection on the actual phono board ? You should have done the signal path from the start ! replace the capacitor on each side !
Yeah, cursed. I've been working on a Sony TC-350 R2R that is just that. Every time I fix a problem something else rears its ugly head and sends me back to my bench. I've determined that its not worth the time I'm putting into it so its now a parts unit. Cursed no more. 😇
STOP SENDING SHORT VIDEOS 😂
Nice production Trevor, whenever I do not recognize something, then always a Japanese import. Early 1970's just too many defective electronic parts manufactured, 1976-1979 for me. Ill remember those Blue Hitachi Caps.
VIDEO IS TOO LOOOOOOOONG !!! 🤷♂️
👍👍😎✌️🤟