14rp4 substitute

[old_coot88]

The + mark on a selenium is simply saying "the B plus comes out of here."

[timmy]

Ok, I'm confused, it looks like I have the diodes right but I'm not getting 255 v from c2 and c3a both are 300 v rated caps at one point it was there then gone. Strange as it sounds, both caps are grounded to chassis which is one side of the ac in the other ends go to the terminals I broke off the old cap never removing any wires this is why I thought I had the diodes wrong. I reversed them and burn the ac input resistor so I put a new one in after putting the diodes back so I'm thinking is it possible to have one diode reveresed, then how to figure out which one but it seems if I change one it will short against the other.

[jr_tech]

Do the diodes check ok? how about the input cap(c1) ? These components may have been damaged when you burned out the input resistor.

jr

[Tom9589]

I'll see if I can describe the proper connections verbally......

Connect the unbanded end of M1 to the chassis ground. Connect the banded end of M1 to the junction of the + end of C1 and the unbanded end of M2. Connect the banded end of M2 to the junction of the + end of C2 and L10.

Be sure to check the caps before you energize the circuit.

I know the manufacturers of the selenium rectifiers meant well, but their "+" designation is just counter to standard schematic documentation.

[timmy]

Ok now I feel like a fool I was using the base of the chassis for ground but didn't realize it's got plastic insulators so I have voltages now all along. Still don't have a raster so time to check voltages at the crt and also put the magnet on the neck where it was when I took it apart and brightness up max.

[timmy]

Originally Posted by Tom9589

I'll see if I can describe the proper connections verbally......

Connect the unbanded end of M1 to the chassis ground. Connect the banded end of M1 to the junction of the + end of C1 and the unbanded end of M2. Connect the banded end of M2 to the junction of the + end of C2 and L10.

Be sure to check the caps before you energize the circuit.

I know the manufacturers of the selenium rectifiers meant well, but their "+" designation is just counter to standard schematic documentation.

Ok thanks and yes that's how I have it hooked up, so ok I got that right.

[timmy]

The SAMs shows 410 v on pin 6and 10 and 30 v on pin 11 but I'm getting around 460 v and 40 v on these pins but I changed the 10 ohm resistor on the ac input to a 22 ohm so I may have to raise that resistor higher but even those voltages being high I thought I should still get a raster and I even tried a 12lp4 to rule out a problem with the right tube and got nothing. Also used the ion trap in all positions, nothing. Video output tube pin 9 should be 155 v but I'm getting 204 v and pin 8 130 v I'm getting 140 v .

[jr_tech]

Is the High voltage rectifier ok?

jr

[timmy]

Originally Posted by jr_tech

Is the High voltage rectifier ok?

jr

Getting almost 9 kv at the anode.

[jr_tech]

Did you try reversing the ion trap magnet so the other end points to the front of the set?

jr

[timmy]

This trap is the same no end is any different then the other. Would this make any difference?

[jr_tech]

Yes...I always mark an arrow on the trap pointing to the front before it is removed so I can put it back correctly.

jr

[Electronic M]

Single magnet traps may work better with one end facing the screen VS the other (I've seen this effect in action)...It's worth trying.

[timmy]

Should these magnets be weak are should they really stilck meaning strong.This one bearly holds a paper clip.

[timmy]

Ok you guys can laugh, big screw up I had been turning the wrong pot for brightness and now that I got the right one turned it up and was greeted with a perfect pic also found the sweet spot for the ion trap.