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Station X · 22nd Dec 2009, 10:51 am

Given that the 75 requires about -2V of bias and it has about -15V of bias it's not surprising there are problems.

I'll work out how to split the bias, but can you confirm that the wiring round the 75 is as per my latest diagram.

22nd Dec 2009, 10:51 am	#197
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,290	Re: Newb Stumped on a Derwent Given that the 75 requires about -2V of bias and it has about -15V of bias it's not surprising there are problems. I'll work out how to split the bias, but can you confirm that the wiring round the 75 is as per my latest diagram. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.