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Hi Don, That's definitely my "do next" item, though the 2N2907 looks like a reasonable substitute for the original BCY70 The following is an extract from an email I received from an Ametek

Brushing with a soft paint brush while vacuuming works well. Don Black.

Perhaps the odd replacement transistor is upsetting the channel balance so the common mode bias change is resulting in a signal output. Try replacing it with the correct transistor now you have it and

Make sure the prop wash is CFC free ;) Don Black.

Hi to all, Till now it seems that knowbody in this group has any information about this device, which is used to verify the performance on the 067-0587-xx Signal Standardizers. Therefore again this

You have a quality instrument in front of you, not a yugo. I can assure you it will not "fall apart in multiple ways". All it needs is some minimum attention, given the life of the instrument it is

The first thing you always should do is checking ll the powersupply rails for voltage and ripple current. This is also always the first chapter of the calibration proces. You probably have some

Very usable. They are great scopes. Fred

Hi- Are the 465B's worth repairing for general use or is it more a labor of love to preserve these machines? I have a Tek 465B (SN 111031) that I use casually. Originally I think it was from UK

Hi - Did you ever resolve the unstable intensity problem? I have the same problem in my 465B. The intensity will toggle from normal to super-bright randomly.

Well, he could most likely part out the good hybrids, attenuaters, power supply & fan, the A5 board, HV power supply, and the CRT for enough to buy a working 2465 and lunch. Especially in Italy. Or

I question whether replacing U800 on a 2445 is worth the labor and the cost of the device. I suppose if it's a beloved family heirloom would make it about the only reason to keep it working.

Hi, Let me add some comments from an experienced Tek scope (including a 555 scoposaurus) restorer to the excellent advice you have had so far: I gather you are not experienced with vacuum tube

Hi Patrick, Seeing the waveform on the input along with the DC component of 60 mV on pin 18 leads me to believe the chip is bad. I didn't want him to go through changing the chip unless I was sure

Hi Rens, I can’t say for sure there is no 7B53 but I suspect the one you saw was a 7B53 Option 6. Option 6 was used for a while on various plugins to delete the on-screen readout and save a few

I believe the outcome is the OP found a good horizontal sweep signal being fed to the input of U800 (pin 18). Since the output (pins 4 & 9) is not correct, it is reasonable to assume that U800 has

I think a summary at the end would be much more helpful than following all the blind alleys.

Howdy and welcome. You have found a great place to assist you with: "~~~ my troubleshooting/tracing/etc. is beginner level. Any help would be appreciated." The following link contains a couple of

How could the discussion of this Tektronix 2445 repair be considered "clutter" to a Tektronix Scope Group? No way, the discussion of this repair is a fantastic source of information and there isn?t

Thanks everyone: I'll try to respond to everyone who has responded to me so far: Yes, I've been searching the archives but getting a lot of generic results. I may just be using too many generic