Ah, thank you, I'll look in to replacing it with a FET and will see what I have in stock. I presume I'll have to do some modifications to keep the heater chain current right: it looks like that intera

I've had a look in my 1S1 and the tunnel diodes seem to be a mix of tiny beads like the ones in the OP's photo, and the gold "top-hat" style package I've always associated with Tek tunnel diodes. One

I've recently bought a P6032 with most of its accessories (the probe-to-BNC and probe-to-GR adapters are missing) from a seller in Germany. I know he has another P6032 set for sale right now, with man

Is this anything like the procedure for the A6302 current probe? I've got a couple of those here and seem to remember that there is an adjustment for the offset voltage of the hall effect sensor. In e

I don't know about the diode, but I'm following this thread with interest. I also have a 1S1 in good physical shape, but it's Heerenveen-manufactured serial number 700183. It also has the trace perman

This. It does sound like external interference may be the problem. For a while I had an office from whose window the tower of the infamous "Palace of Culture and Science" building in Warsaw was visibl

As well as the modified mains voltage switch arrangements, I note that it's had a different mains connector fitted. These mods are presumably part of its military history - looks like it's served time

I'm looking forward to starting to use the 127, so I guess I'd better order some rectifiers. I have experienced a selenium rectifier expiring before, and it's not something I want to repeat... Chris

I've just taken delivery of a very tidy example of the Tek 127 Preamplifier Power Supply. I've often wished that my 535A had more horizontal bays, and now it can have them. I note that it has selenium

The Tek 7912AD here on my desk uses a coax delay line. It really is just two pieces of coax (one blue, one blue with a black stripe, if I remember correctly) coiled up at one side of the instrument. I

yahoo.com@groups.io> wrote: I have a confession to make. I am "that guy". The one who commits sacrilege by using cheap Chinese SMA connectors and cables with his 20GHz wonder-scope. And they're just f

I'm a big fan of my CSA803A (which is best thought of as an 11803A). Even though it's really old, it does things that would need crazy amounts of money to achieve with modern gear. I can look at the i

I have a small collection of these probes in various states of disrepair. My one "known good" one is an A6303. I find it really handy when working on power supplies and motor drivers - the fast respon

Also, on my 7L12, the MHz dial is really very approximate: it's usually within about 20MHz of the correct value, drifting somewhat as it warms up. Mine might be broken, of course, but it's always been

Tek fans, I'm afraid I haven't been active on the list for a while because emails started bouncing for some reason and groups.io cut me off. I think I've fixed that now, though, so can join in again.

I cheated and removed the o-rings in the end. I have no requirement for environmental sealing for this connector, and nothing around it is sealed, so I decided they were just going to make assembly mo

Thank you, Albert, that was exactly what I needed. I'd removed the outer nut which secures the cable strain relief sleeve, and then the aluminium sleeve with the flats which seemed to be part of the c

I'm wrestling with an A6303 current probe which has a broken wire inside the plug, but I can't figure out how to get the plug apart. I've managed to remove the cord grip at the rear (breaking several

Rajesh and Nicolas, thank you for the responses. I've just discovered that the problem may actually be a phantom one: the signal I was measuring was derived from an Atmel XMega microcontroller running

Tek fans, My much-loved 535A has been getting a lot of use over the last few weeks. It lives in my home lab which is where I'm now working due to the coronavirus situation. Generally it's been a delig