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Hi Dennis: We have 2 7104s... and occasionally I see one for sale, and the picture of it usually shows it operating with the amber "limited viewing time" indicator illuminated. I'd only pay the prices

You should be fine. 20% above 200 volts would be 240 volts. BTW, the schematic shows the value C744 as 170 micro farad. George KD6NEW

I would stick with what you have, maybe it's time to do a little service on it, sometimes you need a dual supply or even 3voltages it's rare though. I should have done more resurch on this before I

The condensers you mention were a worldwide scourge. Many millions of them were made when an angry employee stole the electrolyte formula from one company and took it to another. The problem was the

The dim traces on the vertical part of a square wave is normal. This is due to the speed which they are "drawn" on the CRT face. The faster the rise time of the trace, the dimmer the trace will be.

Hi Siggi, While the models I mention do have aluminum SMT electrolytics on the front panel, I have not seen any that were leaking. I suspect that the leaking caps on the older models were a quality

The General Radio part of the IEC site has many old GR catalogs. They will help identify the connectors used and those available as parts. GR used a couple of variations of binding posts, mostly

I've carried the 500s and 7000s, for long distances occasionally 1Km plus, and frequently carried them a couple of hundred meters.. and lots of times carried them 10 to 20 meters, from lab to lab,

unless it is cold worked (like stamping it?)... and then it develops a magnetic response. The strength of which [compared to stainless numbers that are magnetic]… I guess... depends on the amount of

I found a 1001A that I though had a BNC output connector; but, it was an 874 to BNC adapter, inserted into the front panel 874. I have some GR units, mostly older than 1950, mostly audio, 600 ohm

I'm slowly going through my 2235A scope, replacing the Schaffner line filter and the RIFA capacitors on the Pre Regulator board. The RIFA caps were visibly crazed, so I'm glad I'm replacing them

I have a Tektronix 577 curve tracer and I am recapping the power supply board that is located at the rear of the instrument. I am looking at replacing C744 which is a 250V 1700uF capacitor. I found a

While it probably isn't "news" IET Labs still sells GR874 connectors along with other GR equipment that they still manufacture. https://www.ietlabs.com/

I have no knowledge of the particular component, I use a chemistry hot plate that I have roughly calibrated for pre heating, just dandy for certain surface boards where one leg of the component is

My 754D once had a problem with random reboots. Turned out that a couple of the conductors in the ribbon cables between the boards had burned out. It was fine after replacing the cable, maybe your

I usually use a Dremel tool with a cutting wheel. The filter takes a lot of vibration, unfortunately, and a respirator is needed unless you want to breathe a lot of lead particles. But it does get the

Sent from Mail for Windows 10 Hi the schematic from the TekWiki shows reference to PS28—512-1 my main board showsGPC-848A-1 B the schematic is component wise fairly accurate but all the jumpers and

wrote: Hey Jochen, you are absolutely right, I just went to look at my 485. My apologies for the (my) confusion. It does have the Siemens brushless motor though :). I was thinking of the 2465, which

One reason for positive pressure cooling is that it reduces dust. Air is draw in through the filter which removes the dust (one hopes) and blows it through out the chassis. However, positive pressure

fan. It draws the air in through the enclosure and expels it at the back of the scope. Quite the opposite: The fan will draw in air at the back of the 485, and you can feel the warm air coming out of