View Single Post
  #201  
Old 12-07-2021, 01:53 AM
Kevin Kuehn's Avatar
Kevin Kuehn Kevin Kuehn is offline
Workin' Late Again
 
Join Date: Jan 2011
Location: WI
Posts: 3,976
Quote:
Originally Posted by vortalexfan View Post
I have replaced all 3 caps for C3 with brand new caps and I made sure to observe proper polarity, as for the 245V supply to R56 its only measuring about 220V for some reason.
So lets see now.

You said you have 220 volts on the right side of R56 and 25 volts on the left side(pins 5-6 of the 5AQ5).

That's 195 volts being dropped across your 470 ohm resistor.

195 volts divided by 470 ohms = 415 ma or nearly a half amp trying to pass though R56, a measly half watt resistor.

You have nearly a dead short to ground on the left side of R56. There is only 3 paths that current can be flowing from that point to ground, and only 2 which I can foresee that much current could be flowing, and honestly only one unless your 5AQ5 is glowing cherry red.

I seriously suggest you double check your newly installed capacitors, even if they do appear correct they may have failed. First off simply lift one leg of C3-B and see if your B+ comes up.

Edit - there is also the very unlikely possibility that your output transformers primary winding is shorting to ground, which you could verify by checking resistance from it's red B+ lead to it's mounting frame.

Last edited by Kevin Kuehn; 12-07-2021 at 02:11 AM.
Reply With Quote