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

[Chris K]

…and just clip off the connections underneath…easiest and least amount of work

[Chris K]

Probably will get back on this when Bob can get the coils to me. My intention is to replace T-103 without changing the position of the slugs and look at the overall IF response to see if my messing with the other traps has caused the alignment to become a mess. If it can be salvaged by installing a T-103 unchanged from its original tuned state then I’ll leave it at that. If I find the other traps are so misaligned retuning them is going to be very difficult I’ll replace them with the other 2 additional traps with their original tuning and see what the overall IF looks like. Bob has so much going on it may be a bit before he can harvest and get the traps to me so this thread might go on hiatus for a while.

[Penthode]

Originally Posted by Chris K

Probably will get back on this when Bob can get the coils to me. My intention is to replace T-103 without changing the position of the slugs and look at the overall IF response to see if my messing with the other traps has caused the alignment to become a mess. If it can be salvaged by installing a T-103 unchanged from its original tuned state then I’ll leave it at that. If I find the other traps are so misaligned retuning them is going to be very difficult I’ll replace them with the other 2 additional traps with their original tuning and see what the overall IF looks like. Bob has so much going on it may be a bit before he can harvest and get the traps to me so this thread might go on hiatus for a while.

Don't lose confidence! You just have to apply logic and patience. To apply logic, you need to know how it works and what you are doing.

With regards to T-103, you will not be able to leave it as is as circuit variances will affect tuning.

Let us return to the procedure. Since you impatiently began to adjust things before we logically analysed, it means going thru the procedure once again and stopping after the completion of each stage to discuss and not jumping forward prematurely.

In this way you will have a near perfect alignment on this set and you will have gained the knowledge and experience to apply to future alignments.

[Chris K]

Originally Posted by Penthode

Don't lose confidence! You just have to apply logic and patience. To apply logic, you need to know how it works and what you are doing.

With regards to T-103, you will not be able to leave it as is as circuit variances will affect tuning.

Let us return to the procedure. Since you impatiently began to adjust things before we logically analysed, it means going thru the procedure once again and stopping after the completion of each stage to discuss and not jumping forward prematurely.

In this way you will have a near perfect alignment on this set and you will have gained the knowledge and experience to apply to future alignments.

Thanks for that advice. Yes, when I reached the step where the top of T-103 needed to be adjusted by monitoring the voltage on the VTVM, I got very heavy handed (literally, I broke the damn thing!). Part of this was, yet again, another piece of faulty equipment...my VTVM. I wasn't getting anything more than a weak swing of the needle even in the 1.5V range and subsequently, began moving the upper slug all over on T-103. I have since acquired another one that was restored, calibrated and tested. It has much greater sensitivity than the brick I was using.

I think you had mentioned it might be useful to look at the overall response curve to check where tweaks are needed. I guess these adjustments may be so far off now that what you said below isn't an option anymore?


"I should have said on the outset of this adventure, normally the alignment is fairly close. The sound IF is narrower bandwidth and is best gone over more concisely. The traps too need a little adjustment but they should be fairly close.

Because the video IF stagger tuned stages are pretty tuned for a broad response, there was really no need to perform the steps to spot align each stage. All that needed to be done was first sweep the overall video IF and only perform a few touch ups to get the response in the manual. I would only resort to deeper investigation if the response is bad and not easily corrected."

[bandersen]

Are these the right part #s?

[Chris K]

Originally Posted by bandersen

Are these the right part #s?

Yes sir. You got my address and message regarding your time?

[Penthode]

The part no.s do not match the 8T241.

What model were they from?

[bandersen]

I don't recall. I think I just got it as a bare chassis. Sure looks the same as an 8T241 chassis

[Chris K]

They are the same traps in my KCS 28B chassis for the 9TC-240

[Chris K]

This has always been about the alignment of the 9TC-240 (see title). The part numbers match the traps in my set exactly

[Penthode]

They look the same. And the one at the far right looks like T-103.

Also the earlier photo of the chassis looks like the layout of the KCS-28.

I think they will work. At least we will make them work.

[Chris K]

Originally Posted by Penthode

They look the same. And the one at the far right looks like T-103.

Also the earlier photo of the chassis looks like the layout of the KCS-28.

I think they will work. At least we will make them work.

Yes we will...slowly and gently...aligning together...forever!

[bandersen]

Sounds like a twilight zone episode.

[Chris K]

Feels more like “The Outer Limits”

[Chris K]

Not jumping ahead...can't anyway but, at Penthode's suggestion, I made these to facilitate step 16 and shunting the primary windings of the primary coils of the indicated transformers. The resistor is 330 ohms. Should make things a bit cleaner than tacking them in when the time comes.