UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Diabolical Artificer · 13th Sep 2019, 6:30 am

A different OPT will change any characteristics as will the OP valves surely, the end product is unlikely to sound the same. you could try reducing the anode resistors of the PS or as you say change an 83 for an 81 or 2, you'd be best drawing a load line and doing some calcs.

When you come to apply NFB, use a 10k pot instead of a fixed R, adjust to taste.

Andy.

13th Sep 2019, 6:30 am	#6
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,670	Re: Feedback A different OPT will change any characteristics as will the OP valves surely, the end product is unlikely to sound the same. you could try reducing the anode resistors of the PS or as you say change an 83 for an 81 or 2, you'd be best drawing a load line and doing some calcs. When you come to apply NFB, use a 10k pot instead of a fixed R, adjust to taste. Andy. __________________ Curiosity hasn't killed this cat...so far.