I own both the A8500 and A8450 versions. Wonderful amps which I have had since the 80's and still going strong. 240V here in Australia. I never use the tone controls because with really good speakers I always use CD direct mode.
I have a few power transformers I salvaged out of I do not remember what, with the same multi taps as the one you used as a replacement. Of course I did not take any notes when they were salvaged, I was baffled on how to measure them and use them. Thanks for a nice simple demo on how to handle them! my mind has a bad habit of over-complicating things that amp is good score!! and a good demonstration of why it is good to collect a lot of "Old JUNK"!
Nice! I was waiting for the relabel of input voltage. I think you missed the fuse though, needs a 7A instead of 4A, per the board silkscreen for 125V. That could lead to a rabbit hole if it intermittently blows and replaced with a 4A again out of habit or silkscreen. If you run it that high.
That is a nice amp, well done. It pays to keep transformers from non working equipment. Before I had to move to a tiny apt I would keep all the transformers from non working electronics, sadly when I moved I sold them all for copper recovery to a scrap yard for $0.35 a lb. It hurt to get rid of the 1000W+ ones lol
I have an A8650 lying around that the owner didn't want fixed. Needs lot's of hard to get (expensive) transistors. I noticed this A8190 also has the 2SK389 input FET pair device. Those are known to fail - the transconductance slowly changes and the sound gets worse before conk out.
The bigger of the two Onkyo receiver's I have stored in garage, which happen to be the first I got, run's so hot I removed it from in the home. You could fry an egg on it, so didn't trust using it. Amazing sound though! Bought it as an ex-demonstrator about 22 years ago. Paid $1900 Australian.
I actually love the sound of some of the older onkyo units.. there’s a lot of those matsahita units (Panasonic/technics; which you know well I beleive you worked with them for awhile).. that had good power potential (easily 110wrms+) but melted down they’re STK packs when the fans took a shit or sat at idle in high bias.. but here in the 120V side of the world that was probably the best use of a component from one I can think of, lol.. only had a few REAL good units from technics I’ve seen, most of them were high end units though..
Lots of switch mode power supplies can take 90 to 240v. Linear transformers can not. A 240 rated run at 120 will run fine just output half voltage. Put a 120 transformer on 240 and your output will double for awhile and then the transformer will burn out.
I looked up the schematic. It is a double choke. Just 2 wingdings and they are on the secondary side of the main power tranndformer. basically to balance out any phase shift on the secondary. The secondary is a center tapped transformer, but there will be a minute phase shift between the A and B winding with respect to the center tap (ground) just due to the physical offset or a mm or so between the windings. So running the 2 red wired through this choke will in theory eliminate this phase shift. This is splitting hairs for sure, but they have done it for a reason. Don't get me wrong this is one hell of an amplifier and I will not be selling this. Spec wise this is very close to my Technics SUV9. The Technics squeaks out 20 more watts per channel has better damping factor and a little lower THD. SUV9 is rated 120WPS 0.003 THD and this onkyo 100WPC with a respectable 0.008 THD. Again splitting hairs, but it is a fantastic sounding amplifier, and I know I could get a few bucks for it. Obviously if someone shows up with a hand full of cash I'll cut it loose, as i'm not an idiot but that is all that would make me part with this one at this point.
Here in the UK 240v is normal but in order to service imported gear i require 110v and for Japanese gear 100v supplies. 240 to 110v transformers are easy to find i just use an industial safety one, finding high powered 100v is a bit more difficult, and since most of my higher end gear is Imported from Japan i had to swallow the cost and buy the higest rated transfomer i could find. Don't be tempted to run Japanese gear on 110v that extra 10v does make a differnce to long term use.
A good place to find Japanese high power 100 volt transformers is from Japanese arcade cabinets. Loads of arcade forums about selling them from time to time. I picked one up myself that way. In my case for another cabinet 😄They are quite a bit big bigger than the transformer used in this video though.
@@anthonydenn4345 A good tip, except we don't see many Japanese arcade cabinets here in the UK. Why theJapanese chose 100V doesn't make a lot of sense or for that matter why the UK chose 240v it can be lethal.
A 500 watt step up transformer would do the trick, and they are not that expensive. One like this would have done the job perfectly leeselectronic.com/en/product/1038-1038TRANSFORMERSTEPUPDOWN500WST5.html However I didn't want to buy a transformer and since I have access to scrap transformers from old receivers the solution was just to reuse what I already had.
@@12voltvidsAlot of Americans dont know if you have an electric dryer it is 240 we have a plug in my laundry room for 240 ive been meaning to try it but I havent yet
@@12voltvidswe live on the island in the UK it's four times expensive here when My friend went on holiday to America you could buy A CD for $6 in in U s a Kingdom they were £15. 1990 s
Yes and oz is as bad. My brother inlaw lives down under. 30 years ago I wanted a pal 8mm player for conversion work. A model that was 1000 here he looked in stores and it was about 3000. Needless to say I didn't buy it.
@@12voltvids is there any so much I can repair myself then I have to get my Vic to do it £100 minimum per item plus parts and they're not cheap either I have an extensive collection of audio equipment what needs to be serviced regularly most of it's ok but you need to service it to keep on top of it
I love these kind of video's, they calm me down when i am stressed. I'm also into tech as an amateur.
You can't help but love someone so comfortable with electronics that he is bending a pot shaft with a pliers while the unit on blasting some music.
This was a fun project as I was given that unit
The front design of this thing reminds me so much of AKAI.
Nice work to keep a great old amp running. They don't make them like they used to. I enjoyed that.
I own both the A8500 and A8450 versions. Wonderful amps which I have had since the 80's and still going strong.
240V here in Australia.
I never use the tone controls because with really good speakers I always use CD direct mode.
I neber use tone controls either. The recording engineer equalized it the way he intended you to listen.
Great Video, never saw a conversion from Europe power transformer before.
Now I'm on the hunt for "EuroTrash"
The transformer came out of a dead technics receiver.
Euro trash??
I have a few power transformers I salvaged out of I do not remember what, with the same multi taps as the one you used as a replacement. Of course I did not take any notes when they were salvaged, I was baffled on how to measure them and use them. Thanks for a nice simple demo on how to handle them! my mind has a bad habit of over-complicating things
that amp is good score!! and a good demonstration of why it is good to collect a lot of "Old JUNK"!
Don't you just love a new toy that's fantastic 👍👍
Nice! I was waiting for the relabel of input voltage. I think you missed the fuse though, needs a 7A instead of 4A, per the board silkscreen for 125V. That could lead to a rabbit hole if it intermittently blows and replaced with a 4A again out of habit or silkscreen. If you run it that high.
Yes I know. I'm not going to be running it any time soon and if I do I won't be pushing it hard. I have much higher power amp.
Yes! 😅 l am an Amatuer, Congrats all around, it's a Great AMP.
That is a nice amp, well done. It pays to keep transformers from non working equipment. Before I had to move to a tiny apt I would keep all the transformers from non working electronics, sadly when I moved I sold them all for copper recovery to a scrap yard for $0.35 a lb. It hurt to get rid of the 1000W+ ones lol
I had this amp in mind when I scrapped the old receiver with a cooked STK module
I have an A8650 lying around that the owner didn't want fixed. Needs lot's of hard to get (expensive) transistors. I noticed this A8190 also has the 2SK389 input FET pair device. Those are known to fail - the transconductance slowly changes and the sound gets worse before conk out.
The bigger of the two Onkyo receiver's I have stored in garage, which happen to be the first I got, run's so hot I removed it from in the home. You could fry an egg on it, so didn't trust using it. Amazing sound though!
Bought it as an ex-demonstrator about 22 years ago. Paid $1900 Australian.
My technics new class A gets hot just idling, so does my Sansui 9090
Great Job Dave, finally descent speaker binding posts instead of those cheap spring clips
Another educational video, thank you!
I actually love the sound of some of the older onkyo units.. there’s a lot of those matsahita units (Panasonic/technics; which you know well I beleive you worked with them for awhile).. that had good power potential (easily 110wrms+) but melted down they’re STK packs when the fans took a shit or sat at idle in high bias.. but here in the 120V side of the world that was probably the best use of a component from one I can think of, lol.. only had a few REAL good units from technics I’ve seen, most of them were high end units though..
some devices, such as my cable modem power adapter can accept any voltage between 100 and 240 there must be electronics on the primary side
Lots of switch mode power supplies can take 90 to 240v. Linear transformers can not. A 240 rated run at 120 will run fine just output half voltage. Put a 120 transformer on 240 and your output will double for awhile and then the transformer will burn out.
i got a black & decker coffee pot and it says black + decker on the basket i wonder why they changed it to that
I work for UL, we need to talk about those RCA cables. Up the quality and take em' out of the equation.
Their fine no problem.
31:23-what is an "in phase" transformer? Being so close to the power supply it looks like.....well, part of the power supply????
I looked up the schematic. It is a double choke. Just 2 wingdings and they are on the secondary side of the main power tranndformer. basically to balance out any phase shift on the secondary. The secondary is a center tapped transformer, but there will be a minute phase shift between the A and B winding with respect to the center tap (ground) just due to the physical offset or a mm or so between the windings. So running the 2 red wired through this choke will in theory eliminate this phase shift. This is splitting hairs for sure, but they have done it for a reason. Don't get me wrong this is one hell of an amplifier and I will not be selling this. Spec wise this is very close to my Technics SUV9. The Technics squeaks out 20 more watts per channel has better damping factor and a little lower THD. SUV9 is rated 120WPS 0.003 THD and this onkyo 100WPC with a respectable 0.008 THD. Again splitting hairs, but it is a fantastic sounding amplifier, and I know I could get a few bucks for it. Obviously if someone shows up with a hand full of cash I'll cut it loose, as i'm not an idiot but that is all that would make me part with this one at this point.
Here in the UK 240v is normal but in order to service imported gear i require 110v and for Japanese
gear 100v supplies.
240 to 110v transformers are easy to find i just use an industial safety one, finding high powered 100v is
a bit more difficult, and since most of my higher end gear is Imported from Japan i had to swallow the
cost and buy the higest rated transfomer i could find.
Don't be tempted to run Japanese gear on 110v that extra 10v does make a differnce to long term use.
A good place to find Japanese high power 100 volt transformers is from Japanese arcade cabinets. Loads of arcade forums about selling them from time to time. I picked one up myself that way. In my case for another cabinet 😄They are quite a bit big bigger than the transformer used in this video though.
You can do it with a variac. Turn it down and remove the knob and lock it so someone doesn't turn it up.
@@anthonydenn4345 A good tip, except we don't see many Japanese arcade cabinets here in the UK.
Why theJapanese chose 100V doesn't make a lot of sense or for that matter why the UK chose 240v
it can be lethal.
Hi 👋 Dave, What about using a commercial stepup transformer Unit? Just asking. MJ. in B'dos.
A 500 watt step up transformer would do the trick, and they are not that expensive.
One like this would have done the job perfectly
leeselectronic.com/en/product/1038-1038TRANSFORMERSTEPUPDOWN500WST5.html
However I didn't want to buy a transformer and since I have access to scrap transformers from old receivers the solution was just to reuse what I already had.
240 volts you can use your dryer outlet lol but not good idea -Cheers!
I have 240 in multiple locations. Garage, office. Kitchen media room so I could've run it on 240 but 120 mod better
@@12voltvidsAlot of Americans dont know if you have an electric dryer it is 240 we have a plug in my laundry room for 240 ive been meaning to try it but I havent yet
and for my good stereo I have a denon pre amp power amp with xlr outputs have you seen those?
XLR are really only needed for long wire runs. Pro gear uses.
That doesn't surprise me after all look at how many worship T****
Isn't there a voltage doubler AC circuit you could use. Think it involves 2 diodes 2 caps....
Not at the current level this needs. Doubler and trippers work for low current applications.
@@12voltvids why?. 20 amp diodes available 1000v caps available.
Would you be able to hook up more than one pair of speakers to the amp? If you had a choice between Onkyo or Denon products which is a better choice?
Yes it can run 2 pairs no problem.
I wonder why you don't buy a desoldering gun. Those spring loaded things are a pain to watch.
Because they are 500 bucks and I can't justify it.
@@12voltvids I am positive there are more affordable ones available. But, fair enough.
What is the multimeter make and modell ? Looks nifty and I'd like to replace my old and trusty cheap one.
I reviewed it a few weeks ago look it up.
Are you connecting all these amps to your speakers without checking the output for DC?
Why would there be dc? The protection circuit won't turn it on if dc detected.
This should make you happy €500 that's worth One listed in Europe
That would be too much to pay. Those sellers just leave gear up and hope they get someone desperate enough. It's worth about 200 euro dollars.
Worth about 100 here.
@@12voltvidswe live on the island in the UK it's four times expensive here when My friend went on holiday to America you could buy A CD for $6 in in U s a Kingdom they were £15. 1990 s
Yes and oz is as bad. My brother inlaw lives down under. 30 years ago I wanted a pal 8mm player for conversion work. A model that was 1000 here he looked in stores and it was about 3000. Needless to say I didn't buy it.
@@12voltvids is there any so much I can repair myself then I have to get my Vic to do it £100 minimum per item plus parts and they're not cheap either I have an extensive collection of audio equipment what needs to be serviced regularly most of it's ok but you need to service it to keep on top of it