Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

Originally Posted by Chris K

Yes it is set right on frequency and the bright dot in the center is the marker. The frequency on the counter is one of the curve apex markers

I saw you replied the dot is the apex. So the center dot is 21.25?

[Chris K]

Here you go.

[Penthode]

I was going to take your word for it. The secondary needs a slight touch up. But thanks! Let's move on...

[Chris K]

Oh I so appreciate your adherence to detail in this. Certainty when It concerns what I'm doing remotely and with poor photography requires lots of diligence not to mention my inexperience.

Here's what I have to start the sound IF adjustments. Peak is slightly off, sweep is 3mc.

[Penthode]

Looks good. Try also keep the x gain up to see more detail.

[Chris K]

Originally Posted by Penthode

Looks good. Try also keep the x gain up to see more detail.

Slight touch up on the primary got everything aligned and symmetrical

[Chris K]

Had the horizontal inverted. Corrected it. No change to the trace but now the markers are on the right sides of the center.

[Penthode]

Looks good!

[Chris K]

You mean...I'm moving on to the Picture IF Trap adjustment???: worried:

[Chris K]

I think that's enough success for one night! Thank you so much my friend for helping me get this far. More to come!

[Penthode]

No problem.

However, before proceeding later, I may make a recommendation to safeguard the generator.

I always worry in the event the output of the 8601a if the clip comes loose should accidentally touch the B plus supply in the set, the 200 plus volts may blow up the output hybrid amplifier of the 8601a. To safeguard the generator, I would suggest inserting in series with the generator a 1500pf or thereabouts capacitor. I made up my own lead with the capacitor permanently in series with heat shrink over the capacitor and connection with a croc clip on the other capacitor lead. Just as a safeguard. There is some protection on the output but not to protect you from a 250volt application.

Just a suggestion.

[Chris K]

So a 1500pF capacitor on the RF signal out line between the generator and the clip that gets attached to the test signal input in the TV correct? This is to block accidental clip contact with a b+ voltage source in the set from feeding back up the RF out line into the 8601. Have I got that right? Just put the cap in series between the end of the signal wire and the alligator clip that attaches to the tv circuit.

[Penthode]

Yes that's it.

[Chris K]

Question that has nothing to do with alignment. When I first started this project, I had concerns about voltages and total amp draw of the TV (1.75A vs the >2.0A commonly seen). I got lots of great advice and basically stopped worrying about it as the consensus was running the TV with all new caps would make it work more efficiently hence the lower amp draw.

Not sure why I was inspired to do this but I was wondering if the filament voltage had anything to do with this and a less than optimally bright picture on the CRT. The filament voltage is 5.7V AC and not the standard 6.3V. I understand this is an isolated secondary winding of the power transformer with no other draws loading it down. I took the voltage read on the filaments of the audio output tube. This is a shot in the dark from someone who has no idea if this could be an issue but the only paper caps I haven't replaced yet are the safety caps on the AC line. They are baked, oil smeared domino type caps and I have always had plans to replace them but could they have anything to do with AC voltages in the power transformer?

[Penthode]

You don't mind me asking. But what are you using for a voltmeter? If it is the Heath IM-18, when was it last calibrated?