Thanks to Bob from the Tektronix Museum (https://vintagetek.org) I have now a scanned copy of the manual. Finally :) The donation charge was very reasonable. Many thanks!

I had given up hope already, then unexpectedly a gentleman from Glasgow offered my a partially working 5030. He told me it was working when he stored it, quite long ago, but now there is only some mes

I use two TM506. These fans are loud, but very much air flow. I have put a 40°C "Normally Off" Thermo switch in series, attached it to the cooling plate near by the fan. As long a I do not fully load

I use the AM503 in a TM506 with as scope, oscillator and DMM inside, and it's just my standard test tool on the bench, and I love it. It's large size, but replacing that with loose instruments gives m

@Eric Schumacher. Was that baked when the whole tube was ready, or did you bake the empty envelope first? Do you remember the temperature? I suppose the silicone changes into some kind of mildly condu

this fault condition of electrostatic charge on the glass rods, is decribed in the manual which TV7 posted. A very small amount of gas, means the beam ionises the gas, and the ions go to where they se

I see what you mean. Yes 20ps is really fast. I am sure that is usefull for some cases. The 33120A can never do that. I checked what the 33120A could do with my SC504 scope, which is 80mHz. The 33120A

I used an Agilent 33120A arbitrary waveform generator instead if a time mark generator. It costs less, and you can use it for many other things too. I don't know of there are any important differences

For amplifying electrical signals, probably the best is a magnetic amplifier. In one of the Tektronix scopes a saturable choke is used to stabilize the AC voltage from the mains. But all of that is lo

Jim, that sounds worth a try. If by any chance someone has a 5A22N for sale, please let me know.

Sorry, I called it HP130A, but it HP 130C. https://www.hpmemoryproject.org/timeline/bob_devries/hp130c_01.htm.

I know 7A22 exists, but I have at this moment the 5000 series mainframe. And I do have to say the 50uV range of the 5A21N with 5000 Series is dissapointing, because it doesn't work well unless the ban

Hallo Walter, I have been looking for an R5030 or 5031, just to get the 10uV sensitivity. I got the taste of this, from my HP130A oscilloscope, which can do 200uV differential, but absolutely humfree

Dave, for analysing electronic parts you need a device to analyse them, called a curve tracer. And for testing, a tube tester. The Roetest is one of the very few new products which work at full plate

I may do so with transistors as well....

Hello Martin, Such excellent work you are doing! To explain this curious effect you observe, I am just guessing, but perhaps it is like this: The AC signal on G1 gives quite some AC current on the ano

Martin, you connected the stepped grid voltage from the 576, to the G1 terminal of the U61. How have you disconnected this signal from the tester electronics? I understand how you did it with the anod

Hello Martin, hum and distortion components add to the output signal, but this is not the amplified input signal. That causes the somewhat lower result with a tone + bandwidth filter. You could add a

Martin, loss of Gm indicates the use condition better than loss of plate current. There is no such thing as data sheet value for plate current at a given grid voltage. The number they print, is only a

Some tube testers work so crazy, you can only calibrate them with a tube of known data. This was called a standardized valve by the AVO company. It can be any tube, and does not have to be a Bogey tub