[Heatercathodeshort]

Hello David,
I have tested my spare ringing choke in the 131. Unfortunately it gave just enough EHT [?] to produce a very feint switch off spot and even that vanished after a short while. Shorting the EHT lead to chassis produced no spark at all!

I guess the high voltage capacitors in the tripler circuit are leaky.
It may be worth a go at removing the oil via the EHT lead out screw and gently taking a hacksaw to the top folded rim. With care this could be removed allowing access to the contents. It could easily be soldered up and refilled with oil after boiling off any moisture content.

The alternative would be to remove the tripler components including the 3 X EY51s and fit an external colour type tripler connected via a lead accessed via the original output port. This would also remove 270m/a of heater current and would probably result in better regulation.

Just thoughts at the moment. The faulty unit is on the right in the picture. It appears to have been removed from a Philips by the look of the yellow EL38 lead and connector.

Hope to fit a good tube in mine this weekend.
You can't win them all! Regards, John.