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Old 12th Jul 2017, 9:42 pm   #12
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
Default Re: Restore of KB 428

Quote:
Originally Posted by crackle View Post
Yes the centre tap for the heater winding goes to chassis.
The HT transformer from the Alba has two 4 volt secondaries and could probably be adapted by adding extra turns to the 4 volt winding with the centre tap. But would the transformer saturate with the extra loading, the Alba had 5 valves the KB has 6 valves. I guess the addition of one extra RF valve wont make that much difference.
Drawing secondary current will not result in higher flux density so the answer is no. If you try to take more power than the transformer was designed for it will however overheat from resistive losses. If the total power requirements are roughly the same you should be OK.
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