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Albert, I am not sure if this is related but I seem to get a short between Ground and the positive terminals of C790-791-792 ( All have been replaced now) of the regulated heater supply (Upper Left

Albert, I checked the voltages and here is what I measured after a 10 minute warm up; Tube Pin Voltage V609 7 -107.4 V624 6 +1.5 7 -107.6 2 -104.0 V634 6 -38.0 7 and 2 -87.0 1 -87.1 4 -2.4 V627 9

Hi John, Yes Thanks this is the kind of help I need , Yes did check the secondaries voltage wise but not under load,? ?I'm rather busy lately and I have to confess I have not done the math to

Checking these voltages now. Thanks Albert

Hi Steve , Can you tell me more, were the banana plugs over tightened? , or its it a manufacturer defect, have you repaired it ,if so how, please tell us more!? Many ThanksDaven9ooq

Thanks for the comment I Think we established the PS280 was not made by Tektronix although it carries their? name, and was out sourced toGoodwill industries. I really could use some help

Dave thanks for the information on the catalogs. I was not aware of the wifi site. I will have a look. Thanks again Richard W4MCD

Hi all, Well, I bought this book thinking I could study it to learn more about curve tracing (I have a 575), only to find that it is WAY ABOVE MY PAY GRADE! I would like to get this into the hands of

Stand on a rubber mat and keep one hand in your pocket. Know where the other hand is at all times. Avoid live testing if possible, clip the leads on before powering. Use a shorting stick. Tag switches

And, come to think of it, latex gloves probably generate electrostatic discharge.? Sensitive components like CMOS logic could be damaged.? I would avoid any kind of gloves while working on

You imagine that you are protecting yourself, but your protection efforts remind me of the comic routines where some hapless character gets dressed in a hazardous waste suit, complete with a hockey

https://www.ebay.com/itm/L2-56-Semiconductor-device-analyzer-circuits-parameters-meter-an-g-HP-Agilent-/232061133679 -----Mensaje original----- De: [email protected] [mailto:[email protected]] En

Hi, If your 561 HV transformer is acting badly, try heating it with a lamp reflector for a day or so to get the moisture out of it. A college instructor whose lab has a number of 561’s did this each

Be warned, IIRC the linkage that connects between the front panel knobs and the spindles on the HV box must be electrically insulating. You so don't want 1kV on the front panel knobs! David

I've just checked my spares unit, and it is also missing the dual knobs! Craig

Thank you Roger. I will try these out over the next couple nights and report back. Much appreciated. Dave

Does anyone have the winding data for the 561 HV transformer? The manual shows it to be Tektronix part 120-225. thanks

Rick, I cannot help with the first item. Speaking to the second item. The offset pot is held by a plastic cup which is affixed behind the knobs of the pot. This plastic part is not available, except

hi, Does anyone know about the following mechanical bits on 576 CT front panel ? a) Max Peak Volt / Series Resistor linkage mechanism: I am missing the dual knobs for this & the mechanical (coaxial ?)

Hi Randolph, You checked all the tubes, but also the voltage reference tube V609? Should measure about 85 V. The grid voltages of V 624 should be approximately equal, well within 1 V or so. The