To close this: (a) Thanks Dennis (b) the heatshrink plus some other support for the solder joint is absolutely essential for the soldered-pin-only solution, otherwise the joint is just to weak and

I plan to replace some electrolytic and tantalum capacitors on the main board of the 577. I notice there are 2 electrolytic capacitors C391 C393, 15uF 100V, would this film capacitor work

Has anyone measured the low frequency (like 1 kHz) primary inductance of a normal, OK 576 HV transformer? I looked at the data sheets (at tekwiki) on the part, and none appear to show any inductance

Albert, I re-read your post about the V609 voltage reference tube and it occurred to me that I could not test the 5651 tube with my tube tester so I just put it back in. However, I had another one

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

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

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: TekScopes@groups.io [mailto:TekScopes@groups.io]

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

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