[Valvepower]

Hello,

Ah, it was just one channel, that explains the choke.

It was probably me that mentioned the Super Black Box as I’d recently taken a pair of SBB amplifiers and fettled them to work as a pair of mono amplifiers for line level inputs.

Yes, I’ve seen the Bailey Pentode/Triode phase splitter which is used in the later Radford and Richardson amplifiers. I have Radford STA15 and a Richardson SA170, both of which use that phase splitter. I suppose the Bailey phase splitter was the final word before it all went ‘transistor’ as regards valve amplifiers. Anyway, thanks for the link.

I suppose the reason I went with the Jeffery phase splitter was purely down to finding an original Wireless World High-Quality Audio Amplifiers reprint book (attached) with the original Jeffery article at a BVWS Harpenden Swapmeet what must be 15-20 years ago. I looked at the Jeffery circuit in this book and thought I’ll have a go at that circuit one day!

The Radiospares mains, output transformers, and chassis for the ‘Jeffery’ build also came from BVWS Swapmeets over the years.

Oh-well, better get into the workshop and put a few more hours into the current guitar amp build – today, it’s wiring input jack sockets and preparing the tag panel with leads to connect to valve bases, controls and suchlike etc., etc.

Terry.