Quote:
Originally Posted by kramden66
thanks ,now long does a glass ballast tube last ?
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From the Amperite ballast catalog .PDF:
http://www.amperite.com/assets/Documents/Ballasts.pdf
Quote:
LIFE EXPECTANCY:
Average life if operated as recommended 2000hrs.
If operated continuously at maximum voltage 1000hrs.
If operated continuously at 80% maximum voltage 5000hrs.
If filament is operated below glow point 5000hrs. and up
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Amperite still makes glass time delay relays and ballast tubes, just, unfortunately, not the ones used in the Motorolas any longer, I don't believe, though there might still be something close. They also might do a custom job if someone wanted to pay the $$$ for maintaining vintage originality since they will do custom voltages on the glass TDRs.
In about 1998, while I was working on my Dynaco Mk.6 tube amplifiers, I accidentally dropped one of the 6NO30T time delay relays (delays the preamp tube B+) just a few inches to the table I was working on and it shattered. I was horrified and started thinking if I knew anyone with glass blowing equipment and abilities to re-seal it when I found Amperite's number and called them up.
I asked the receptionist something like "This may sound like a silly question but do you still have any of the old glass type time delay relays lying around?" The very helpful woman on the other end said cheerfully, "Oh, yes! We still make those. Not a problem. What model do you need?"
They cost something like $98.50 each but I ordered two and still have them here, NIB, as spares.
(I also found a few used ones on eBay and I think what I've had in there for the past 15-16 years is a used 45 second one, IIRC. The 6NO45T)
The .PDF for the G (glass) series Time Delay Relays is:
http://www.amperite.com/assets/Documents/g.PDF