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  #16  
Old 01-17-2006, 10:06 PM
peverett peverett is offline
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Open heaters seemed to happen most often on the series string AC/DC radios. Either the 35Z5/35W4 or the 50L6/50C5 would open up.

I have not seen many on TVs.
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  #17  
Old 01-18-2006, 12:14 PM
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bgadow bgadow is offline
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Ditto here. I had a 35Z5 open up on me this past weekend but I cannot remember the last time I found a dead filament tube in a TV, save for some HV tubes where the glass had cracked.
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  #18  
Old 01-18-2006, 05:49 PM
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Chad Hauris Chad Hauris is offline
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I had a Zenith 23" b/w set where the filament was open on the crt. Hooked the crt filament leads up to a horiz output tube and the tube lit up, so CRT was definitely bad. There were some other cases of no CRT filament I have seen but it was due to the crt being slightly cracked in a non-obvious area and losing its vacuum.
Also had a 6MJ6 horiz output tube burn out filament on a very well used CTC-39.
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  #19  
Old 01-19-2006, 09:41 AM
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Pete Deksnis Pete Deksnis is offline
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Quote:
Originally Posted by frenchy
On the ctc-10 it is just wired in series with the main voltage coming out of the transformer and into all the filtering caps etc.
Frenchy. Are you sure the device is wired into the secondary somewhere? Looked up the original schematic that came with the CTC10 and couldn't find it. Found the CTC10 RCA service literature and ditto, but I could have missed it.

Had to replace the Thyrite in that set in the latter sixties and I'm pretty sure it went in the primary of the power transformer. The fils are definitely in the loop because as I mentioned somewhere earlier, it takes the pilot lamp two seconds to ramp up to full brightness.

Pete

Last edited by Pete Deksnis; 01-19-2006 at 03:29 PM.
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  #20  
Old 01-19-2006, 11:08 AM
andy andy is offline
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Last edited by andy; 12-07-2021 at 02:25 PM.
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  #21  
Old 01-19-2006, 03:39 PM
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Pete Deksnis Pete Deksnis is offline
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Took another look at the service lit and...

found the surge device this time. In the CTC10 at least, the 'Thyrite' is R136 and it's in series with the power transformer primary. Listed as 'Surge resistor, 79 ohms cold' part number 107291. A secondary benefit with this design is that room lights on the same circuit don't dim at turn-on!
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  #22  
Old 01-19-2006, 09:37 PM
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Charlie Charlie is offline
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bgadow mentions having the '60 Motorola with the B+ delay switch. My '59 Motorola 21" has this same switch. I think my late-50's RCA portable has one as well. The switch engages about 30 seconds after turning the set on. This delay switch apparently works well with the electrolytics since both of my sets still have all the original capacitors in them and play just fine.
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  #23  
Old 01-19-2006, 11:09 PM
frenchy frenchy is offline
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Quote:
Originally Posted by Pete Deksnis
Frenchy. Are you sure the device is wired into the secondary somewhere? Looked up the original schematic that came with the CTC10 and couldn't find it. Found the CTC10 RCA service literature and ditto, but I could have missed it.
Pete
You are right, I was going on my bad memory, R136 in the primary on my schems, so it would indeed ease the power-on thru the entire set.
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