Motorola ts907 low hv

[Yamamaya42]

If bad, it would have to be made up on a small pcb, It's been done before.
https://retrovoltage.com/2014/10/09/...tric-circuits/

[timmy]

So this agc network would this be a cause for the voltage being pulled down via the 6hs8 tube ?

[Yamamaya42]

No, if not working the way it should, the AGC voltage/pulses would be all wrong, and tuning and IF would be all messed up and you would not be able to tune in anything.

[timmy]

Ok but when I get the tube I’ll try it but overall I still have the voltage dropping so if the tube don’t work out I’m still looking for a cause for the voltage dropping.

[zeno]

Timmy
Could you sum up what is wrong with the TV NOW without going
through the previous repairs.
In other words plug it in & see what happens like you never seen the set before.
I have lost track......

Prev screen shot looked good. But long distance troubleshooting is a challenge !
Many of us could take the TV like shown in the screen shot & vastly improve it
in seconds. That would maybe weed out problems.
Also remember NEVER trust a tube checker. The best checker is a known
good NOS brand name tube. We had an advantage here. I could turn
around & pull a tube from the shelf. It was abt 8' long & 5' high with sleeves of common tubes, more old numbers on shelves in the crapper.

73 Zeno
LFOD !

[timmy]

Originally Posted by zeno

Timmy
Could you sum up what is wrong with the TV NOW without going
through the previous repairs.
In other words plug it in & see what happens like you never seen the set before.
I have lost track......

Prev screen shot looked good. But long distance troubleshooting is a challenge !
Many of us could take the TV like shown in the screen shot & vastly improve it
in seconds. That would maybe weed out problems.
Also remember NEVER trust a tube checker. The best checker is a known
good NOS brand name tube. We had an advantage here. I could turn
around & pull a tube from the shelf. It was abt 8' long & 5' high with sleeves of common tubes, more old numbers on shelves in the crapper.

73 Zeno
LFOD !

ok first the pic with the face was to rule out the video amp and output by injecting video. Turn it on b+ good few seconds later b+ drops and in doing so the horizontal oscillator won’t run because b+ is being pulled down to far so in using the sets IF cannot get an image weather or not the voltage being draw down has to do with that I don’t know maybe there is an IF problem as well. I have a tube coming maybe this is the problem I don’t know until I get it to try.

[timmy]

Got the 6hs8 no different but I did pull the 6cg7 AGC and vertical multi voltage stayed up I got a new 6cg7 made no difference so the one vertical half is working because I have a full screen so that may leave it to an AGC problem still bearly any sound scratchy static sound and with the 6cg7 in I can here a buzzing from somewhere. If k3 is bad or the cap inside is shorted I can make it up but it shows a line under the 94k resistor which is the .002 cap but it also shows a ground in the center of the line so where does the ground come from. I don’t remember seeing a cap with 3 legs. Does this mean 2 caps one on each side of the 94k resistor both to ground.

[timmy]

Does anyone know what this T line means 2 .002 caps one on each end of the 94k resistor

[Yamamaya42]

Originally Posted by timmy

Does anyone know what this T line means 2 .002 caps one on each end of the 94k resistor

That is another couplet, like K1. K3 is a combo part, 2 resistors 1 cap in 1 package.

[timmy]

But the T does it represent 2 caps one on each side of the 94k

[Tim]

It intends to show .002 distributed across the resistor. When making a replacement put a .001 to ground on each end of the resistor so the total is .002

Is there another resistor that is covered by the black splotch?

[timmy]

Originally Posted by Tim

It intends to show .002 distributed across the resistor. When making a replacement put a .001 to ground on each end of the resistor so the total is .002

Is there another resistor that is covered by the black splotch?

No there is not only one for this area.

[dtvmcdonald]

Originally Posted by Tim

It intends to show .002 distributed across the resistor. When making a replacement put a .001 to ground on each end of the resistor so the total is .002

Is there another resistor that is covered by the black splotch?

A more common interpretation of the separate component intent of that figure
is two resistors of half the listed value in series with the listed cap value attached between their center to ground. That of course assumes that the big black dot is meaningless.

You really need to get or borrow a scope to sort out messy problems like these.

[Yamamaya42]

Originally Posted by dtvmcdonald

A more common interpretation of the separate component intent of that figure
is two resistors of half the listed value in series with the listed cap value attached between their center to ground. That of course assumes that the big black dot is meaningless.

You really need to get or borrow a scope to sort out messy problems like these.

and a better DVM.

[Yamamaya42]

remove V1,V2,V3 ,V7,V8.

feed video back to test point B like you did before and see how long it can run like that.