Canadian Marconi TV 102T17

[maxhifi]

Originally Posted by irext

That's a great start. Youv'e even got a full raster. A few Australian sets had the IF's arranged in a straight line like yours (PYE, Astor). Some had them on a sort of sub chassis suggesting they were all pre aligned then simply dropped in during chassis assembly.

Were there any transformerless sets in Australia? 240V seems like a lot of filaments.

I really, really like my new isolation transformer. It's so luxurious to be able to work on a line powered device without being paranoid about safety.

[dieseljeep]

Originally Posted by maxhifi

Were there any transformerless sets in Australia? 240V seems like a lot of filaments.

I really, really like my new isolation transformer. It's so luxurious to be able to work on a line powered device without being paranoid about safety.

Paranoia runs deep, into your life it will creep!
The sets built in the 240 volt areas used valves (tubes) that had a higher heater voltage at lower current. Many times they added up to more than 120 volts, so they only had to drop less voltage from 240 volts. The mains dropper was a high wattage item and still a common failure item.

[maxhifi]

Originally Posted by dieseljeep

Paranoia runs deep, into your life it will creep!
The sets built in the 240 volt areas used valves (tubes) that had a higher heater voltage at lower current. Many times they added up to more than 120 volts, so they only had to drop less voltage from 240 volts. The mains dropper was a high wattage item and still a common failure item.

I've worked on TVs and radios for years just by identifying what prong is connected to the chassis, plugging it into the neutral side of the receptacle, and then lifting the ground on my test quipment to break the ground loop. Never once shocked myself, but I always checked voltage to ground before touching anything. There's no way I'm the only one to do it this way, it is obvious and easy, but only one mistake away from a shock. It's nice to get rid of all that nonsense.