View Full Version : Packard Bell 17VT1


Winky Dink
06-26-2017, 11:37 AM
Subject: CRT Testing

I would never have thought of acquiring this set, but a friend (Iíll call him Philo) rescued it from someone who was putting it out with the garbage. He plugged it in and the screen lit up, so he shipped it to me. For free, Iíll try to put the set in working order. Philo will get a kick out of that.

Iíve pulled the chassis, and all the parts are there. The only shipping damage is one broken tube and a broken escutcheon, both easily repaired or replaced. And the yoke is loose on the CRT neck.

My next step will be to check continuities to ensure other significant components arenít dead. Iíve tested the tubes, including the CRT.

Iíd like an experienced person to assess my test results on the 17AVP4. With a Beltron 8080A, 6.3 heater volts:

No shorts.
Ten seconds to reach 0.45mA.
After four minutes, it reaches 0.55mA or maybe 0.65mA.
Interrupt: Current immediately decreases, reaching almost zero in seven seconds.

https://c1.staticflickr.com/5/4213/34739933323_7e48a1377d_z.jpg

So, before I spend any time on this set, what can I expect from the CRT?

Thanks all,
Henry

bandersen
06-26-2017, 12:35 PM
How long did you have thee CRT running on the tester ? I like to leave them run 30 minutes to a couple hours to "wake" them up. Often emissions, cutoff and life test will improve.

Winky Dink
06-26-2017, 03:24 PM
Thanks. I only ran it five or ten minutes. I'll run it for a couple of hours this afternoon and see what I get.

Winky Dink
06-26-2017, 06:09 PM
I checked the heater voltage from the 8080A. It was probably 6.7 volts for the previous test. I adjusted it to 6.3 volts and ran it for 90 minutes. This time it took about 2 minutes to peak at barely over 0.2 mA, then slowly decreased to 0.15 mA where it stayed for the entire test period--then dropped to less than 0.05 mA in a few seconds.

Entirely hopeless? Even if it's hopeless I'm going to play with the restorer just to see if the meter and indicator lights work.

maxhifi
06-26-2017, 06:18 PM
After you let it "cook" for a while, if it's still really weak, you can also try running it at, say, 8V for 10 minutes, then put it back down to 6.3 and test it again. Has worked for me. Only time I tried "restore" was on a Trinitron, and it made it much worse, rather than better.

Winky Dink
07-11-2017, 08:31 PM
I left the instrument on for several hours and tried increasing the voltage for 10 minutes, but had little change in subsequent test results. Then I ran the restoration procedure one time. After that the test meter rose promptly to .85mA, the minimum "good" result. When the voltage is cut, it only held that current for two or three seconds. I repeated the test two days later with the same outcome. So, I'll proceed with the electronic restoration and hope for the best.

StellarTV
07-12-2017, 12:40 PM
Since you've got the Beltron, run a clean cycle on the tube. Won't hurt a thing and it's very likely to bring that tube right back, even without running a full restore cycle on it. I just can't say enough about Beltrons. :banana:

Winky Dink
07-12-2017, 05:32 PM
After reviewing my personal notes and retrieving deleted email, I now recall that I ran a cleaning cycle first without even a flicker of the lights, then did one restore cycle. That's my story and I'm sticking to it!

Electronic M
07-12-2017, 09:06 PM
I ran a cleaning cycle first without even a flicker of the lights...

That is normal. Do you have any idea how many tubes you'd need to clean at once to make all the lights in your house flicker? :D

Winky Dink
07-13-2017, 03:54 PM
If you knew me better, you’d realize that I might take down the entire power grid by changing the batteries in a flashlight. (Just ask my wife what happened the first time I tried to fix a toilet.)