Dave said:
Shortage of the output mosfets I believe, I found a supply of bare
circuit boards at a ham radio fair rally some years ago.
2SK135 and 2SJ50 both in stock at RS components.[/QUOTE]
I dunno then, I dont think kits need CE approval especially if they
aren't mains powered, I could be wrong tho.
Some years ago I dismantled an old Studiomaster 1000watt mosfet
amplifier with a burnt out mains tranny, and that furnished me with
enough power mosfets to make about a dozen 150 watt modules up. I made
up some boards of my own with double the number of output devices which
proved quite sucessful too.
That same Hitachi[1] based design turns up in a multitude of guitar and
pa amps from the 80`s and 90`s virtually anything with the words mosfet
on the front. The actual output section rarely gives trouble. (IME)
[1] I believe.
Ron(UK)
