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Old 13th Mar 2008, 2:06 pm   #15
Robert Darwent
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Join Date: Aug 2006
Location: Sheffield, South Yorkshire, UK
Posts: 990
Default Re: Vidor CN426 HENLEY

Quote:
Originally Posted by Mullard View Post
The heaters in the Henley are series connected for both mains and battery operation. Any open circuit heater will therefore stop all heaters working.
Whoops! You are correct John. Don't know which Vidor pdf I clicked on the other day but it wasn't for the 'Henley'!

The valves are series connected in this set with the two filament halves of the DL94 also in series, not parallel as I stated previously. So a poor heater pin connection in any of the valves will obviously break the heater chain and stop all the valves from working.

And it appears that is the case since Dave has now reported finding a broken pin clincher at pin 1 in one the sockets.

Regards
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