[Duke]

Originally Posted by tubeswell

There is generally always some residual ripple in the B+ when you use a CRC filter. But one of the reasons that SE amps tend to be hummier than PP, is that there is no phase cancellation in the OT that otherwise occurs in the primary winding of OTs in PP amps, which otherwise cancels this residual ripple: so if you don't like it, you need another way of getting rid of it. A CLC filter between the rectifier and the OT supply node will get rid of virtually all of that hum (if you decide to change your mind and take if further at some stage). In this regard, a choke provides superior ripple cancellation. The EMF that surrounds the choke iron (when a current is running through the choke winding) acts to stabilise and regulate the current (which in turn stabilises the voltage). The little 4H 150R standard small fender choke http://www.triodestore.com/22707.html is all you need for a SE 6V6 amp like that. Run a 10-20uF filter cap and then the choke in front of the 'normal' OT supply node cap - see suggestion

Thanks man, that's really helpful and it looks simple. I need to figure out where to place the choke on the chassis. Any suggestions?