ctc12 clone beam current

[timmy]

the terminal guide for the focus coil looking in from the rear is this how to determine the 1234 terminals or is it the as if looking from the front in. the sams dont say and i could have the numbers backwards, if its the other way rather then looking in to the rear.

[Username1]

Each tie point on the fly has a clearly marked indicator as to what it is...?
Anyone have one of these on the bench and can put up a picture of it for
reference...? Does the Sams have resistance checks between each pin set
to check against a resistance number...?

Is there a way to check to be sure these three points are guarantied
wired correctly.....?

For coils:
They usually mark it on the schematic, for default I go to tube view, clockwise
looking from above and one pin is usually got an identifier, it's pin 1.
Resistance checks are a good backup for things that are not clear.
Even if you have to go and test another coil somewhere else in the set...

Thordason usually packs a install note with their transformers, and in some
cases Sam's notes replacement part oddities, like a tie point not internal
on a replacement fly.

Whatever you do, don't swap any wires until we have a really really reasonable
bit of evidence that something may be wrong with the way it's in there......
If this thing explodes I want it to be because we decided to dynamite it
on purpose from a safe distance and film it for youtube....

Anyone got picts of focus coil & flyback wiring we can check out as reference...?
Any replacement notes, etc. Ideas, dynamite, demo caps remote det. ???
.

[timmy]

ok i have the paper from the focus coil i got from moyers and the number 4 terminal has no connection and on the coil it has 3 wires tied together the only ones used are 1 2 3 the 4th one is just a tie point for the coils so i have that wired correctly.

[timmy]

well the terminal coming off the damper that says dont measure would be the hv end of that tube and the schematic shows the centering is tied to that damper terminal and my hv probe just bearly moves and if it were 1kv the needle would move half of the room to the 2kv mark but its not. i would have expected it to move enough to see.

[Electronic M]

The do not measure end of the damper tube (cathode) has HV AC pulses on it, and the HV probe will only measure DC....Unless it is an HV oscilloscope probe.

You will not get any meaningful readings from the damper cathode so don't bother measuring there...You are more likely to damage your equipment measuring that point then get meaningful data.

[timmy]

ok in the other post you asked about the crt pins 3- 6 - 7 you said 315 -200 - 600 i just check those and they are 3- 583v 6- 194v 7- 584v now i also checked pins 3 - 11- 7- all 3 of these came up 584v and this is with the drives counter if i raise the 3 drives they all are 760v . 584v seems to be alot with the drives completely down all the way. this test was with the crt plug off.

[timmy]

when i first got this set i spoke to a tv tech from way back in the 60s and is still repairing tvs and i told him about the hv and also the 3 color lines across the screen and that i could not get rid of them. well he was hell bent on telling me the crt was bad, no matter what he wanted to hear nothing else , the crt was bad period. how or why he was so sure and persistant that the crt was bad i dont know. i even told him it tested very good he tells me " it dont matter the crt is bad"

[Username1]

They should be with the crt plug on, but you did that measurement a few posts back...
I just thought it was high at what should be cutoff, just wondering out loud. Sorry.

.

[Username1]

I think the point BB on the flyback is the B+ Boost, this runs all the way up to
the picture tube screen adjustment pots through that resistor... R108 10K
Can you check that one, and be sure it's ok....?
Also can you verify that if the flyback has "BB" stamped on it, that there is a direct
connection to parts like C 113, and those 1.5 meg ohm resistors for the
shunt voltage reg. divider circuit...

.

[timmy]

Originally Posted by Username1

I think the point BB on the flyback is the B+ Boost, this runs all the way up to
the picture tube screen adjustment pots through that resistor... R108 10K
Can you check that one, and be sure it's ok....?
Also can you verify that if the flyback has "BB" stamped on it, that there is a direct
connection to parts like C 113, and those 1.5 meg ohm resistors for the
shunt voltage reg. divider circuit...

.

there is no BB on the flyback and there is no BB shown on my schematic.

if you are useing an rca schematic the locations are different numbers so the 10k that you speak of i think it comes right off the flyback on a 720v boost source and runs to the focus coil then to the linearity coil then to one of the 1.5 meg resistors at the hv regulator then to the yoke.

[Electronic M]

I'm confident the junction of R108 and C109 is the boost...It even says "B+ Boost" right above that next to the '6BK4' label... C109 clearly filters the boost line.

[Username1]

Ok, so lets get a number, and compare that to what someone else gets at the same
point and see what's going on......

.

[timmy]

ok i know where to get that from being this info is coming from an rca schematic and the sams i have is numbered different but thats ok ill use the hv probe there. my sams also shows 720v and 390v is this the 390 boosted up to 720v or is this 390v plus 720v ?

[timmy]

i dont know if it matters but if this boosted voltage feeds the RGB drives that i checked befor at min setting i can tell you that each one turned up max is 760 volts. testing numbers 3-11-7 pins on the crt socket unplugged is what i got.

[Username1]

I'm thinking it's 720V because of what is going on with the screen controls....
Just not sure of what exactly is needs to be... They are suppose to add to the
B+....

Now did you get a good reading on the focus voltage...? Your meter
doesn't load it too much....

.