Power on the green pre

[frob]

thanks that made things alot easier, there sold through amazon.com
http://www.amazon.com/AVEL-Y236103-15V+15V-TOROIDAL-TRANSFORMER/dp/B0006N3YZY

 

[kato]

you can also buy it directly from PartsExpress.com

They sell a lot of other useful-for-diy stuff too, especially speaker and crossover building. good prices on neutrik xlr jacks, etc. (get their catalog.)

 

[peterc]

You can buy Avel-Linberg parts directly from them

Peter

 

[phatmateo]

Hi Peter, my avel lindberg Y236103 is overheating when I connect my 2 green pres to the power supply.  The power supply reads the correct values for DC when I have no load connected.  What should I check? On the secondaries I have red and orange as the center tap(GND) and black and yellow connected separately to each AC connection on the power supply.  Here is the connection chart(http://www.avellindberg.com/transformers/y23_range_connections.htm).  This is correct, right?  Sorry if Im making a dumb mistake, I thought I had it figured out, but never ran into an overheating xformer before.  Let me know if you need any more info.  Thanks

Update:  Pictures
http://img35.imageshack.us/img35/5320/green2h.jpg
http://img39.imageshack.us/img39/1475/greenxformer.jpg
http://img37.imageshack.us/img37/3607/green1y.jpg

 

[phatmateo]

Update:  So when I disconnect the red and orange from GND on the PSU and just keep them connected to each other, the heating/humming goes away and voltages are normal, except that I get a 0V reading for phantom power.  Do I have a grounding issue?  I've swapped transformers and the same problem occurs.  This is confusing the hell out of me!  Good learning experience though   Hopefully someone can help me out

 

[peterc]

OK, lets approach this logically.

Disconnect the transformer from the PSU board. Leave the Or/Red connected together for now, switch on. Still humming / heating? Do you have something connected to the centre bolt of the transformer? If not, check the phasing of the transformer taps, maybe there is an error in the colour coding of the wires.

Check this thread for phasing info

 

[phatmateo]

Hi Peter, I figured it out.  One of the metal standoffs was touching the pad for one of the AC tranny connections, which was shorting it to ground, causing it to overheat/hum.  I replaced the standoff with a nylon one and all is well.  If you ever do a PSU revision, maybe adding a little more space between the 1N4007 and the standoff would stop this from happening.  Thanks so much for the project!  I'll be posting pics within the next few days. 

 

[peterc]

Good one, enjoy