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Thank you, Raymond and Siggi, for taking the time to answer to this post. Unfortunately the motor of the blower is beyond repair (back side bushing is completely broken), therefore the whole stuff

Just to clarify, because it seems I might have mislead Stephen to think I was suggesting something needed to be done: I was mystified as to how the "mesh" was being driven at all because I missed that

I don’t know that yet... But I’ll report back when I’ll get to it. I’m working on another restauration project at the moment.

Of course I was! ?

Raymond, Yes, I read that. But I thought maybe it could eventually be modified. Which I was not gonna even try to do, even if it was possible. I’ll just try to make it work the way it is. After all,

Not sure if you were joking. I was dead serious and Tek assumed people working on the 'scope weren't color blind. Have a look at the colors on the other wires going to the CRT. Raymond

You can't do without any voltage on pin 12. See Satbeginner's message. A bias voltage of about 150V is needed or all electrons will just land on the grid and die/charge it. IOW: If the image is fine

Thank you Michael! ?

Because the designer was colorblind?? ??♂?

Stephen, Here is a link to an excellent article on the Vintage TEK site. This is by Peter Keller and explains the mesh and its function.

Time to give away another secret: The wire actually is white, with a brown and a red stripe. Guess why? Raymond

BTW, you’re talking about “mesh” this, and “mesh” that... I don’t even know what that is. Could someone please enlighten me? What does it mean?

So I guess this one is a pretty early model then. In my other thread, I was asking about “missing parts”, referring to those that had been obviously scavenged, not to those that had never been

And the wire is the red striped one in Stephens picture that runs in front of the R1431 resistor over to the bundle, and then up to the CRT. I see now what they did, and I was distracted by the

Eureka! There it is, right in front of me. Dave

That's what I was looking for. Yeah, exactly, the early service manual doesn't include those components, and those are the components that are supposed to drive pin 12 of the CRT. Your picture shows

Hi all, A while back I transplanted a 465 CRT to a 2235, and in that one too I needed to add the Pin12 wire and components to provide the appr. 110VDC. Like Raymond said, just one resistor, diode and

Thanks to all that offered advice on my freezing TEK 2430. I've replaced the RIFA safety caps and all of the less than 50v electrolytics in the low voltage supply. I'm at the 4 hour mark and

Sure it does. We're talking about VR1434 and C1434 in the CRT schematic. Figure 7-17 shows them just to the right of the space between the long ceramic combined resistor R1431 and C1404, right above

C1427, R1427?? I don’t see them on the pictures you posted.... ??♂? Look at the one I’m posting right now