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Fairly sure my 7603 has a separate SA graticle, since I'm currently using the standard graticle instead.

I made use of Mouser’s search function and looked at all TO-220 NPN that were 300V+ and 2A-10A. The widest Safe Operating Area is the BUJ303, and it’s better than the Mospec/Harris/Boca 2N4240

I tried my 7B50A this morning and it exhibits the same behavior so I'm wondering if there's not really a problem with the 7B80 and that's just how they worked. I saw a video from Zenn where he was

No, TO-3 matches to the now-obsolete TO-218. Dave Wise Sent: Monday, March 14, 2022 6:26 AM To: [email protected] Subject: Re: [TekScopes] Type 106 Saga (Again) I thought it was a match to a

A quick reply to all, as am in the middle of a jo, but... ...there is a 75v zener (VR1718) which I noticed this morning that has failed, so I'm gonna change that first before anything. This is also

Dave, The 7L5 manual shows "Graticule Spectrum Analyzer" as a standard accessory, part #337-1159-02. John

James, Well done for discovering the error but you need to get the +65V fixed before something else gets too hot. You need to (quickly ?) measure the voltage at each point along the chain from (pin

James, Great to read you found your problem. I read the posts to see if I could help further. The others were masterful in helping! Stellar gentlemen who well deserve respect. I agree with Ozan about

This explains why center tap wasn't behaving like center tap. These voltages are still wrong and if the scope is powered like this it will cause more damage. Most of them are wrong because +65V is

I thought it was a match to a TO-3.

When you touch the probe tip to the contact, the tip jumps from zero to whatever the contact is at. Your DVM sees this as a large AC voltage, which it is. As time passes, the only AC the probe sees is

Thank you for your reply Mark, I have disassembled the entire 177 and checked all the wafers one by one but could not find anything wrong. The 177 was not meant to be taken apart for cleaning, I can

I have found the problem. As mentioned at the beginning of this thread, the scope had been working after the initial repair, and it was only after upgrading the two bridge rectifiers that the

You probably do want to up the wattage on that bulb. I've got a board with 5 bulb holders on wired as a dim-bulb tester, so I can play tunes (up to 5 * 200W bulbs if I can find any). D.

You haven't found the external 7603 specan grat because it's internal to the CRT.? I don't think they made an external version, but I could be wrong.? My 7603/7L5 was designed as a dedicated

Thanks for letting us know - any clue how that happened?

Anybody have an option 25 tracking generator for my 7L5 they want to part with? How about the spectrum analyzer graticule for a 7603? Yes, I've checked with Sphere and always keep an eye out at at

Hi James, This is your project so it should run on your time, no problem continuing later. My comments are below for next time you are on the scope: Perhaps the wires are mislabeled. Your 24VAC test

Any particular reference in mind that would be quite robust?

These were exactly the points which were measured across I do have a 24v transformer but that shall have to wait until tomorrow now as it's late here. supply? Actually, I already knew that