Motorola ts907 low hv

[Yamamaya42]

https://www.rfcafe.com/references/po...rch-1967-4.jpg


best i can find on short notice

[timmy]

Hmm interesting well I’ll look at that and see what I come up with and at the same time I hope there’s no bad resistors in the tuner itself.

[Yamamaya42]

That is always possible, but due to it's nature, the tuner is a bit more forgiving with resistors drifting than other areas of the set due to the fine tuning, and the ability to adjust each core.

[timmy]

I pulled the cover and they actually look clean but when I touch the contacts they feel gummy or sticky maybe this is some sort of tuner lube. Maybe I’ll just clean the one that’s marked 3. Maybe alcohol is good to get the sticky stuff off.

[Yamamaya42]

Most likely an old cleaner lube that has broken down, I'd clean both 3&4.

[Yamamaya42]

If its really bad...

https://www.radioshack.com/products/...-and-lubricant


but its almost impossible to get now.


I have 1/2 can left.

[Yamamaya42]

LOL!!!

Some maniac is trying to sell a can of it on evil-bay for $150!
CRAZY!

I got it for $10 last year! :O

[timmy]

Lol 150 bucks lots of sick people on eBay. And I have a half can of the same stuff from RadioShack but I just put the cover back on it was a real headache.

[Yamamaya42]

here is a thread about it.
http://www.videokarma.org/showthread.php?t=65178

And yes, the cover is easy to get off, a PAIN to get on, same on all sets.
The engineers must have been laughing a LOT about that!

[timmy]

Yup got to bend the tabs alittle bit and finesse it. I’ll have to put everything together and see what happens because I had the horizontal coil way out to get hv and since changing the damper and readjusted the hv and made sure I had -45v on the tubes so if the frequency is way off the can create a problem getting an image.thing is I didn’t try it with an antenna after changing the damper I only put the video in and got the image so I’ll try it together.

[Yamamaya42]

AGC & NOISE GATE adjustments may be giving you trouble, to start with, be sure they are set at their center of adjustment.

For both of them, the more CW the pot is set, the more sensitive the tuning, the more CCW, the less it is.

[timmy]

Yes I had both already at mid point. That horizontal coil was so far one way the slug was out of the coil by an 1/8 but now it’s up inside close to half with good hv where I couldn’t get good hv unless the coil was out all this because the damper was bad so with an antenna maybe this will do it lol �� I’m almost burned out.

[timmy]

Ok I’m completely baffled plugged it in sound came right up all of a sudden I just about had a picture but was all distorted it come in and out I pulled the plug tried other tubes no different at all turned on again the sound was all but almost gone and the voltage started dropping again to the point of almost red plating the hot again. The sound sounded like something was interfering or shorting. There has to be a disc shorting to possibly ground to pull the voltage down like this as the picture flickered so did the sound.

[Yamamaya42]

Don't be focused on sound AND video at this point, that can come later, you have shown that things work OK from the detector forward with the video input yesterday.
For now, I suggest you remove V7, V8 ,V9 completely, and work on getting a clean input from the tuner to the screen.
Then once you have reached that point, put the sound tubes back in and then focus on getting sound.

Best approach it to get it up and stable section by section.

[timmy]

Ok voltage steady with those tubes out but the 6dt6 looks alittle white in side soi have another but still can’t get a pic it kind of flickers from almost a pic to snowy lines.