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Station X · 10th Apr 2020, 11:03 am

With R25 measuring 459R and 9.85VDC across it, the calculated combined anode and screen current is around 21mA which is around half what it should be.

Has the replacement speaker simply been wired in place of the output transformer primary? Is the 1400R energising coil measuring correctly?

10th Apr 2020, 11:03 am	#78
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Pilot U650 With R25 measuring 459R and 9.85VDC across it, the calculated combined anode and screen current is around 21mA which is around half what it should be. Has the replacement speaker simply been wired in place of the output transformer primary? Is the 1400R energising coil measuring correctly? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.