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In Reply to: RE: PCC88 heater voltage is 7,6 volt, not 7. posted by iodemus on March 10, 2015 at 13:41:07
The heater is rated for series string (rather than parallel) operation so is usually referred to as a 300mA type , hence the 'P' prefix . I do not think using at 6.3V is a good idea . I once built a clone of Allen Wright's PP1C , this could take E88CC or PCC88 . It used DC heaters with an LM317 current source set to 300mA .
Al
Follow Ups:
I have never opened my EAR912 nor do I have the schematic, but then it should be ok to substitute ALL 5 PPC88 with ECC88/6DJ8 or other derivates which draw 300 mA. I was thinking of replacing them with E188CC, but they draw 335 mA and it is no good to starve them with 300 mA. Wonder how to get a schematic.
Johnny
How are the heaters configured ? Suggest you email EAR
Al
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