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Old 13th Apr 2010, 8:11 am   #12
Michael Maurice
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Join Date: Feb 2006
Location: Wembley, Middlesex
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Default Re: Philips Hi-Z record player

Thank you Rich & Andy for explaining this to me, I must admit that it is unusual to see a UL and EL mix of valves but then Philips were, - in fact actually still are - known for their unusual designs.

One concern is if the output coupling capacitor C15 goes leaky or short circuit, then DC would be present on the speaker coil causing it to burn out.

Measure the resistance of the speaker which should be approx 800ohms, also check the inductor marked on the diagram as S6 to make sure it hasn't gone O/C.

May I suggest that you recap this set changing C4, C6, C12 and C15 at the very least.
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