01-16-2009, 12:39 AM
I've just about finished overhauling this set, it has been taking longer then I thought, but that's pretty normal when going back over someone else's work. The set seems to be from around 1949-50 according to the RCC manuals, but it looks like a Canada only wooden model using a similar chassis to the US Transitones, perhaps a model 520? I found a few bad resistors, the worst being a 69,000 ohm resistor supplying the screen grids of the converter and IF amplifier tubes, it was reading 530,000 ohms. I think that this may explain the low volume situation. I replaced the choke resistors in the power supply, one was a one watt 220 ohm resistor, the other a half watt 1200 ohm unit, replaced each with larger wattage resistors. I also replaced the plate resistor for the 14B6 while I was at it since it was next in line, it was reading 540,000 rather then 470,000 ohms, it won't make much difference in performance but it likely would have gone open at some point anyhow. So two more paper condensers to change, then the filter condensers, and we are onto alignment.
Happy New Year
Arran
Happy New Year
Arran