Having assembled the kit I am getting a loud hum on both channels -without any input connected
I have tried using shielded wires for both input and output leads but it makes no difference
The transmformer is 2 x 12VAC but only rated at 12VA - I realise this is low but would it cause the problem?
I have now read other posts and note that the mica insulator is probably w s not installed correctly - corrected.
I have checked IC pins with voltmeter set to 20 V DC - no input signals present
Pin 1 0.8v Pin 2 3.88v Pin 3 0v Pin 4 -3.69v Pin 5 -5.6v Pin 6 1.55v Pin 7 4.8v Pin 8 0v Pin 9 0.5v
Does it appear that I have damaged the IC and if so would it be the low rated power supply that would have done this.
Advice gratefully received.
Mike
Thanks