开云体育

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

I noticed on the TekWiki page for the 7B80 that the 7B50A uses the same custom trigger chip. I then looked at the schematic for the 7B50A and it appears the trigger board is identical to the one used

You may be able to select a TO-220 part. The TO-220 package was designed to match the lead and mount-point spacings of TO-66. Dave Wise Sent: Sunday, March 13, 2022 3:46 PM To:

This says what you think as center point is actually one of the ends. Point marked as [9] is center tap and should go to mid point of C1722/C1723. Two ends are [7] and [3]. Measurements should be [9]

What AC voltage do you measure at the two transformer taps of CR1721? One lead of the voltmeter is at center tap, and two measurements to each side of the secondary. No need to disconnect

Hi Ozan, actually you might have made a good point, as the scope has been connected through a dimbulb tester due to R1726 starting to smoke whilst connected directly on to the mains, which measures

----- There is also another adjustment LO/MED/HI. Which setting is used and what voltage do you (carefully) measure at your power outlet with a high quality AC voltmeter? What AC voltage do you

Unfortunately not. You did get me to check though... :) James