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I've just bought (but not yet collected) a 575, I think the 400V option. I suspect it's been stored several years unused. This will be my first piece of Tek valve kit (apart from a 130). Is there an

I recently purchased a set of extenders for the 49x series from Norway Labs in OR. Link: http://www.norwaylabs.com/ $110 for a set of three + shipping. Not sure if these work for the 27xx series. One

A muti-meter reads in RMS volts, which will always be lower than a scope measurement, which is Peak-Peak. However, if you rotate the Vert Variable knob fully CCW, it will give a close approximation to

Yeah I didn't notice that feedback from this discriminator, which in any case I don't understand how it works. The waveform shown in the schematics looks shaped to me. Whatever is doing this shaping

Thank you for this information guys. I was also reading in the user manual that it's designed to a milspec that certifies it to run in a wider temperature range (coldest to hottest)... not that that

The OS-245 has no fan, I don't know if that is the same for the 7603? One detail that is different is that the OS245 has a CTR with a border around it outside the grid, they call it overscan area or

David The PC Board extenders for the 27XX ( and 49x series as well) are Tektronix part numbers 670-5562-00 and 670-5563. If you google either of those numbers it will lead you to a company in Downers

The OS-245 has a militarized gray cabinet with excellent louvers. It is the same as a 7603N (i.e., no readout). I have one (but, like many things, don't need it).

If you need plugin extenders, supply them for 7k scopes: https://www.ecosensory.com/tek/tek_7K_flex_sales_blurb.txt -- John Griessen -- building lab gear for biologists Ecosensory Austin TX

The 549 works perfectly. I have checked linearity of the time matk generator & it is spot on. You may well be correct in that the 50+ year old varactor diode has changed some of its charastics. I

Not sure it is as sophisticated as you think! everything done as you suggest, and will look as you also suggest @ D164 waveform. In some way the tail end of the dispersion linearity falls away - will

After reading Harvey's and Albert's recent posts, I went back to the first posts and realize only now that it isn't clear that the oscillator runs at all. I thought it did... but only generating a

Hi Keith, In your very first message you mentioned amplitude about 1.5 V pp at Q1418-collector. The pp amplitude at the base winding will be half or one third or so of that at the collector winding.

If you can get boards made and locate the relevant connectors, I can send you gerbers for the 7854 extenders. Dave

Timothy, What's with the multiple copies of your messages - it's tedious seeing seven copies of the same post! Do remember that most of us receive the posts by email so if you make a post using the

Hi Keith, In my opinion the voltages around Q1404 (E 3.24, B 3.88, C 3.25.) are more or less "normal" when there is no HV voltage. Q1404 is driven far into saturation (trying hard... as Raymond said).

Ancel, I searched the files section from March and I cannot find anything related to the 2465B caps. Can you send me the link or point me in the right direction. Thank you

Menahem, Thank you for taking the time to write that reply. I am a novice circuit designer and I am just beginning to learn the importance of things like ESR in a circuit and your post is the guidance

I've never heard of that, but I suspect that it's much too much of a job, never had a mechanical 7A13, went for the digital ones. OK, the 7CT1N can be used in either the vertical or horizontal slot.

Thanks for that effort, but I'm not going to agree with some of your choices. I have sold hundreds of these kits to 24xx owners all over the world, and have paid close attention to the comments of my