Quote:
Originally Posted by Electronic M
Not counting the broken tube or the tube presently installed in the CTC-16; I have 3 loose 6LQ6 tubes in the boxes you brought me. One unmarked (likely Dentron), one RCA and one Sylvania. The unmarked one tests 50 on my tester (upper end of the bad tube zone), the others test in the 90 range.
I tested almost all the tubes you brought me (three in the brown box and the ones in the CTC-20 were not gotten to yet). One 6GH8 in the boxes was bad. I replaced a bunch of tubes in the CTC-16 most tested healthy, but failed the grid emission and or short test of my tester....There were some weak ones, the HV rectifier, the audio output, and the 6GH8 that was NOT in the chroma osc. circuit.....Both 6GH8s were replaces since both failed in some way. Your set also now has one of two nuvistors I've had in my stocks for years....I was dumbfounded that I was able to locate one, and that it was the right type.
  
The tubes that are not weak (most of them) likely would be fine to use, but I replaced them with better ones (mostly from my stocks) anyway....You can use the old ones as spares since it was working fine with them in place. I also put two of my good 6GU7s into the spares bucket to make up for the original I ruined.
The new tubes did not significantly change the performance aside from (I think) better color lock, and reception strength.
BTW the spares boxes contained 2-4 tubes that fit the 20, but not the 16. Do you want those or should I pop them in the CTC-20?
Yes Old_coot, you are right, I either miss-typed or jumbled the number in my head. 
I'm going the heck to sleep now. I'm exhausted. |
The unmarked is a Dentron yeah. Internally something is different about them, that they got their own Dentron part number, and refuse to work inside of a television. So as a result they never test quite right. I know it's good because last time I transmitted with the amp on full blast, I was seeing some pretty sweet RF power.
The 6JE6/6LQ6 that's installed in the CTC16 now (Or rather when I delivered it to you) is actually from the CTC20 originally (It's hat looks more like that of a HV Rectifier). I swapped them around. Go ahead and take it out and keep it, and pop my spare RCA back in. That gives you an HO tube for the CTC20 then.
As for the tubes that DON'T belong to the CTC16, those belong to you now. I just popped a pile of tubes out of the CTC20 the final time I decided to mess with the CTC16.
Let's arrange pick up in the next week or two. Mom's car is in the shop currently getting the transmission replaced, so I don't have a warm safe SUV to transport it home in currently. And with it supposed to rain most of this week, the bed of my truck is not a good idea.
And do not buy what the tester says. Jim will chime in and agree, HV Rectifiers never test correctly. They almost always test as bad. Same thing for the Focus 1V2 tube, they test almost bad. You have to remember, the tube usually has 25kW pumping though it, so the tester can't even scratch the surface. Jim and I tested almost 10 of those tubes and they all tested pretty much the same. "Bad"