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geofy · 23rd Jan 2011, 7:12 pm

Across the speaker tags you should measure (with set turned off) 5 Ohms approximately with the speaker disconnected. The transformer secondary will also have a low reading if it is intact, this also has a tapping that goes to a tone corrector C28 which gives negative feedback to the grid of the output valve via R52, R21.You have already measured + at C2 150V (101V) and +++ at C1 185V (124V). ++ is the other end of R1.

But please be careful this is not the ideal set for a beginner, make sure the mains neutral is always going to the chassis.

23rd Jan 2011, 7:12 pm	#65
geofy Retired Dormant Member Join Date: Jun 2006 Posts: 1,798	Re: Philips B3X85U troubleshooting Across the speaker tags you should measure (with set turned off) 5 Ohms approximately with the speaker disconnected. The transformer secondary will also have a low reading if it is intact, this also has a tapping that goes to a tone corrector C28 which gives negative feedback to the grid of the output valve via R52, R21.You have already measured + at C2 150V (101V) and +++ at C1 185V (124V). ++ is the other end of R1. But please be careful this is not the ideal set for a beginner, make sure the mains neutral is always going to the chassis.