Quote:
Originally Posted by DMcMahon
Hi Ricard,
Definitely only 2 HT rectifiers with AC from transformer for the EF804/86 heaters. This is shown in all the TK 819 documentation I have seen and also in the documentation for similar models 820/823/830/920 etc.
I mentioned in one of those earlier posts about the fact that EF86 was not very bright, I will have to have a look to see if I have an EF86 in another of my recorders, if so then will be able to do comparison of brightness level and anode voltage etc and swap the valves over also for comparison.
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I realised afterwards that the EF86 valve is used in all my older Grundigs so I have plenty to compare to. Looking at the various schematics they all range from 50 - 65 volts for the anode voltage, so my 200 volts on the TK 819 is definitely abnormal.