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Old 26th May 2019, 1:43 pm   #7
Hoveradio
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Join Date: Jan 2005
Location: Pant-y-Dwr, Powys, UK.
Posts: 134
Default Re: Philips 575A suitable output valve replacement help required

I think you may need to lose about 30v on the anode supply.The PM24M has a stated max of 250v and the ACO44 would have had 280v on the anode.
I think that's where I went wrong.I have now fitted a PM24A in pentode mode that has a 300v anode max and a 200v screen max. Fitting a weak rectifier has got the volts spot on but this is only going to be a temporary fix for now. I also fitted a B5 base to make things easier.

I believe that the E443 is very similar to the PM24M.
John.
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