Bob Krassa is very correct in regards to not using WD40 for switch (and potentiometer) cleaning/lube. When used the light volatile carrier eventually evaporates leaving a heavy sticky Cosmoline type

Hi Dennis, Thank you and Michael for all your moderately profuse information transmission, modulation and noise (reduction) in your duties as moderator, bringing moderation and great knowledge to the

Hello All, I finally had time to get back to fixing the TDS3044B with no display.   The problem turned out to be a bad solder joint on a surface mount choke that supplied Vcc to the display.  The

Definitely use a "plastic safe" lubricant. Also one that has proven non-corrosive characteristics. The vast majority of these switches are simply dried out, gentle cleaning and lubrication will

This swithc looks similar to the one in the Sencore PR57 AC Powerite. The basic operation is that pushing the button has to cause the latch bar to move sideways. In these switcches that as done by

Hey guys, newbie here. First of all I want to say thanks for what a great resource this place is! Made my donation two days ago. I have a Tektronix 2245a, which I bought about a year ago. This is

Sent in a donation PayPal from my other email address. I don’t need credit per se. So no worry. Thanks for all the hard work. -- Joe Laffey

Dennis, It is a very bad idea to short out a turn on a transformer. But it is a very good idea to load a turn or two on a transformer... after all, that is the transformer's job. Here is what your

Hi Dennis, I just read your message and sent you my contribution of USD20.00.Thank you for the great job and effort you are doing all the year.This is a fantastic group. Love it !!!Wish you a Happy

" but what about the data stored in the chip? how did you transferred the original NVRAM content? I think it has the number of hours and power cycles and also SPC constants in it, right?" I probably

Thanks, Albert. That's about as definitive as it can get: https://patentimages.storage.googleapis.com/a3/1e/8c/f0878e160074e6/US2009013.pdf Arden

That would not be a logical test, Dennis. The jumper would have to be a resistor to simulate the resistance of the brush. But if you must jumper the turns with a wire do it through a current

Dennis, You can confidently place your trust in three other wise men, Karplus, Tuttle, and Ohm. https://patentimages.storage.googleapis.com/a3/1e/8c/f0878e160074e6/US200901 3.pdf Ed, k1ggi

Hi Dennis, I made a contribution and Paypal came back with this message. It's probably not a problem, I've never seen this kind of message. --Victor

Hi Dennis - I just sent a contribution via PayPal as well with a note that it is for TekScopes on groups.io dues. :-)

Hello all, fine notes on 577 and variacs! The 576 is essential for power electronics design and debugging. This monster is robust, in 25- 30 years, I have never serviced it except to replace blown

Hi, I need a leveling head form my SG5030, but the current pricing on EBay is out of my budget. Does anyone have a scrapped leveling head for the SG5030 they would be willing to donate? Many

Hi Dennis, 21.50 USD is my contribution, on the way through Paypal right now. I delayed one day because of the email address discussion. Best wishes to all in this group and their families. JMI

To refresh memories: https://groups.io/g/TekScopes/topic/7651993 Albert

The 494A is supposed to be an upgrade to the 494. As far as I've investigated, the frequency, time and amplitude specifications are reasonably similar... however the digital, and software/firmware,