Lash up Direct Conversion Receiver

[Skywave]

I am hoping to obtain a second hand PW Drive from an old HRO scrapper . . .
Lawrence.

There's a 'pw drive' on the Golborne Vintage Radio site if that's of any use!  
No, but seriously, I'd never heard of a 'pw drive' until you joined this forum . . . and it seems that it has some association with the H.R.O. receiver (shows his ignorance  ). Yes, I have owned a few of those receivers in my time, but never met that name . . . so what, exactly, does the 'pw' refer to? (I've deduced that it isn't Practical Wireless!   )

Al.