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 Selenium Rectifier Replacement in a Healing 400h
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 Return to top of page · Post #: 16 · Written at 8:51:11 PM on 20 June 2019.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5257

Fixed that. This damn thing is headed for scrap. Something has gone wrong with the PSU feeding the screen. Below 10 degrees it's screen starts to flicker & 2nd opinion says its not the drivers. Not good trying to read it while its flickering.

I have actually used the panel mounted resistors to replace field coils & chokes.
 
 Return to top of page · Post #: 17 · Written at 10:05:53 PM on 20 June 2019.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6688

I have actually used the panel mounted resistors to replace field coils & chokes.

Actually a very good idea. Noted.
 
 Return to top of page · Post #: 18 · Written at 9:12:29 PM on 22 June 2019.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5257

Shame to waste all of that heat sink material, which a metal chassis offers.
 
 Return to top of page · Post #: 19 · Written at 10:42:53 PM on 10 August 2019.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2372

Getting back to that live chassis battery portable, have you considered using two small transformers like this:

240 to 2 x 15v in series followed by a full wave voltage doubler for the 90v B+

240 to 2 x 6v in series, full wave CT, followed by a pi filter for the 7.5v.

Advantages: No live chassis, no big dropper resistors, no heat.

Draw you the circuit if you email me.
 
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