My Brand New CTC-7!

[SwizzyMan]

Originally Posted by DaveWM

if you seem to lack vert height, check for a 1 meg resistor on the vert height control pot. this should go from there to the boost supply.

look for a 1.8 meg resistor on the vert PCB, both this and the 1.0 meg can be checked in circuit (they are isolated by caps or tubes).

I don't recall but see if there is a paper cap .047 off the 10k resistor from the BB term of the fly (should be on the bottom of the chassis). check that resistor and replace that cap if its a paper. If its a disk its prob ok.

The .047 is coming off the vert height pot and is a browndrop

[DaveWM]

check the 1.0meg and the 1.8meg read back values. If it was mine I would prob replace the .047 cap (boost filter) just to protect the flyback. I would use a 1kv while as was at it.

[SwizzyMan]

Getting about 1.48 megs on the 1 meg resistor

[DaveWM]

what is the HV?what about the 1.8 meg? and the 10k from the BB to the 1 meg.

[SwizzyMan]

1.8 meg is fluctuating from 1.7 to 1.9 to 1.8

[Zenith26kc20]

Way too high! Whenever I replace vertical section resistors I use larger wattage if they will fit and look right. If it is a 1/2 watt I use 1 watt. Vertical parts take a pounding from the waveforms and break down the resistors. RCA ran the vertical hot on the side chassis sets.

[DaveWM]

you might have to take the 10k out of circuit to test. Not sure I understand the flux reading on the 1.8 should be steady. the 1.0 being high may be a prob but you should have enough height adj to compensate if that is the only thing off.

before replacing a bunch of parts you should take voltage readings and try new tubes.

[DaveWM]

oh and number one thing to check would be the B+. Maker sure you are getting the correct line voltage in and the correct B+ coming out. If the set uses 5U4's try a fresh one or two of those.

[SwizzyMan]

Originally Posted by DaveWM

you might have to take the 10k out of circuit to test. Not sure I understand the flux reading on the 1.8 should be steady. the 1.0 being high may be a prob but you should have enough height adj to compensate if that is the only thing off.

before replacing a bunch of parts you should take voltage readings and try new tubes.

10k is reading 14k

[SwizzyMan]

Originally Posted by DaveWM

oh and number one thing to check would be the B+. Maker sure you are getting the correct line voltage in and the correct B+ coming out. If the set uses 5U4's try a fresh one or two of those.

This one doesnt use 5u4's but there is a bumblebee right at the ac interlock

[DaveWM]

hard to say since I don't know what you are doing with the pots. It "could" be the issue (lack of vert) but I have seen much larger drifting and still be ok. if you had been off like 10x then for sure.

check the tube voltages, try tube subbing and get back to me on the B+ voltages.

[DaveWM]

Originally Posted by SwizzyMan

This one doesnt use 5u4's but there is a bumblebee right at the ac interlock

cut out the bumble bee if its still in the circuit, if its across the line you dont have to worry about replacing it right now.

[SwizzyMan]

One of the filter caps now starts to get warm... But it is next to a cluster of tubes so maybe the heat from the tubes might make it warm?

[SwizzyMan]

B+ is 204v out of 270V

[DaveWM]

should be close to 400v right at the fuse.

you are using the correct fuses right?