Just looking at the 5w/8ohm data, the 60hz and PS energy is actually rather low- 90dB down which you would barely hear (the A weighting does improve things measurement wise). Most phono stages on vintage gear does have a higher hum due to their large gain. Replacing caps related to the phono stage would almost certainly help. Thanks for the question.
Power supply related fundamental & harmonics are a common feature of amps' spectra at low level and unless you happen to utilize a fully balanced design, difficult to overcome.
@@paulb4661Sometimes an amp will come across the bench and have better than 80dB PS "hum bars", which are not typically anything I can hear on my Wilson speakers.
Thanks for the comment. The point of a lot of "vintage gear" is the fact that it is vintage gear. I would much rather own a '67 Corvette than and Prius, though the Prius has heck of a lot more features. I agree that a lot of modern gear may cost less and perform as well, but it will not have the look or feel of that older amp/receiver. Check out episode # 126
modern stuff is not repairable with its multi layer miniaturized circuit boards, just pray the manufacturer still stocks those boards after 10-15 years...
@@cyclist2906 Very good point. Probably not so much the case with power amps having multi-layer boards, but it certainly can happen. Of course, finding a replacement pot, switch or transistor/FET/IC could be problematic on vintage gear, unless it is real popular and there are work arounds.
Getting schematics for modern stuff. Now that's more of a problem than the boards. Often not available. The boards are repairable. Just requires different repair equipment.
I enjoyed watching this review.. Looking forward to your livestream! Thanks
Many thanks, Scott! I am looking forward to it- hopefully there will be more than just you and me, though that would be ok.
I see a lot of energy at 60 Hz and its harmonics. And even 30 Hz on the phono. Seems high - is that normal or does this amp need some work?
Just looking at the 5w/8ohm data, the 60hz and PS energy is actually rather low- 90dB down which you would barely hear (the A weighting does improve things measurement wise). Most phono stages on vintage gear does have a higher hum due to their large gain. Replacing caps related to the phono stage would almost certainly help. Thanks for the question.
Power supply related fundamental & harmonics are a common feature of amps' spectra at low level and unless you happen to utilize a fully balanced design, difficult to overcome.
@@paulb4661Sometimes an amp will come across the bench and have better than 80dB PS "hum bars", which are not typically anything I can hear on my Wilson speakers.
Heavily overpriced old stuff , any modern amp is equally good but much cheaper!
Thanks for the comment. The point of a lot of "vintage gear" is the fact that it is vintage gear. I would much rather own a '67 Corvette than and Prius, though the Prius has heck of a lot more features. I agree that a lot of modern gear may cost less and perform as well, but it will not have the look or feel of that older amp/receiver. Check out episode # 126
modern stuff is not repairable with its multi layer miniaturized circuit boards, just pray the manufacturer still stocks those boards after 10-15 years...
@@cyclist2906 Very good point. Probably not so much the case with power amps having multi-layer boards, but it certainly can happen. Of course, finding a replacement pot, switch or transistor/FET/IC could be problematic on vintage gear, unless it is real popular and there are work arounds.
Getting schematics for modern stuff. Now that's more of a problem than the boards. Often not available. The boards are repairable. Just requires different repair equipment.
@@jasonk5979 Even schematics for older, hi end gear may not be available. Thanks for the commentary