How much available space do you have inside the unit where the transformer is mounted?
http://www.antekinc.com/details.php?p=51
http://www.antekinc.com/details.php?p=51
Bando transformers
- Thread starter johnemonahan
- Start date
Probably get by with this selection.
http://www.antekinc.com/details.php?p=662
http://www.antekinc.com/details.php?p=662
QSilver
Super Member
On the other side of the transformer there is a small capsule with two pins in it which have blobs of solder on them but I can't see if they are joined or just are pins.
QSilver
Super Member
Just spotted that the main fuse before the transformer is rated at 630mA so a smaller torroidal would do wouldn't it? It's rated at 150W Max so that's 80VA 1.6A so would a 80VA 25Vx2 torroidal be good? Then its not stressing the fuse or doesn't this matter anyway?
...Think I might've just contradicted myself...
...Think I might've just contradicted myself...
Shouldn't the main fuse be 2.0A or 2.5A ? The schematic is kinda low resolution. It should also be printed or labled somewhere near the fuse location on the unit as to what size fuse is required.
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You need approx 28-29 vdc rail voltage.
20vac X 1.414 = 28.3vdc - .6 = 27.7vdc.
27.7vdc is close enough.
The question is what VA or current capacity to select.
Anteks AS-1220 is 100VA or 2.5amp which should be sufficiant. It has a dual primary so it can be wired for 120vac or 240vac 50/60 hertz. It has the 0- 20,0-20 secondary which can be wired 20-0-20 fashion.
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The only fuse you need to be concerned with is the mains fuse.
Series wire the primary for 240v configuration.
http://www.hammondmfg.com/5CHook.htm
Series wire the primary for 240v configuration.
http://www.hammondmfg.com/5CHook.htm
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QSilver
Super Member
Sorry to drag this up, but I finally got around to doing it and bought a Toroidal 120VA transformer that gives me two 20V secondaries. I Centre tapped it to get the right voltages and the amp works perfectly.
I've been using it for a week or more and its been fine. But tonight I came to it and tried to turn it on and.... nothing.
I checked and the main fuse (630mA) had blown. I replaced it and tried it again and it blew instantly. I took it to the bench and put another fuse in and hooked it into the DBT. The bulb flashed bright then went dim - almost out and the amp worked perfectly - no issues.
I then took it off the DBT and tried it again and the fuse blew.
I'm guessing that maybe the new Toroid is a bit higher rated than the old transformer or it allows for a higher in-rush (I think i remember something about toroidals being able to cope with higher in-rush) so maybe the fuse needs to be up rated or changed to a slow blow?
I'm not 100% sure what to do so I seek your advice and guidance.
Thanks!
I've been using it for a week or more and its been fine. But tonight I came to it and tried to turn it on and.... nothing.
I checked and the main fuse (630mA) had blown. I replaced it and tried it again and it blew instantly. I took it to the bench and put another fuse in and hooked it into the DBT. The bulb flashed bright then went dim - almost out and the amp worked perfectly - no issues.
I then took it off the DBT and tried it again and the fuse blew.
I'm guessing that maybe the new Toroid is a bit higher rated than the old transformer or it allows for a higher in-rush (I think i remember something about toroidals being able to cope with higher in-rush) so maybe the fuse needs to be up rated or changed to a slow blow?
I'm not 100% sure what to do so I seek your advice and guidance.
Thanks!
hope someone can help here....I have a pioneer A-88X and have a power selector gone, without it I can seem to hard wire it 110 volts. I did my vsx7500 , but I had the broken selector and is a single transformer... im looking at it now and im not attempting until I get some better info!
This is a real junk amp. I suggest not spending any money to get it working. If you can get a free new transformer, then sure, but please don't buy something new. That's expensive, and this amp will never sound good.
