please HELP bourned Source resistor Aleph 30

[wijgers]

Hello,

Just applied 20V rails and burned two Source resistors.

The two resistors are conected at the negative rails, and burned within 10 sec.

Voltage is +- 21.4 V
There was no input conected
There was a 30 W 8 ohm resistor at the output.

Please help what could be wrong???????

Nils

[MikeW]

You have a short. Check all transistors. Run the amp without a load. Most problems I have had are with the 9610's. I have a few extra if you need some.

[Dennis Hui]

Don't forget to check the NPN transistors and
make sure they're in the right way.

Good luck.

Dennis

[wijgers]

Thanks for the replies, But It was me who made the mistake.

By mistake and uncarefull checking, I didn't conect R 18 to the colector of the current source MPSA18.

After a good check, I did another try, And it worked. No failures any more.

Listened to it I was Clear it make a defference. More AIR, very detailed, en bright.

So next thing to do is make a PRE and build a case for the Aleph 30.

Thanks again.

Nils