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Hi Keith, A waveform is not complete without an indication of DC levels. When Q1416 is all the time in saturation, then the 3 waveforms will look identical, but the base waveform will be at about

Ho John, Congratulations on getting the 575 400V version (575 Mod 122C). You should search through the archives for advice on bringing up older vacuum tube instruments carefully to allow the

Hi Rick, The brilliant designers of the 7000 series made sure all of the slots were "generic". In other words the slot doesn't care whether you put a horizontal or vertical type plugin in it. There is

Lot of old ICs here…some should be relevant to 70s & 80s Tek gear. https://www.ebay.com/itm/302763294559 Pardon the intrusion.

The 49x and 27xx use the same extender kits ...line for line... The 27xx series was basically just updated 49x's some of the boards are even common -DC manuals@... -- Dave

I have been switching to aluminum poly caps which cost more but it their specs look so much better. Lower ESR, Longer life, Higher temp. handling. <mustang_gt_y2k@...> wrote:

I spent some time going over the circuit around Q1416, and made a photo with the various components labeled here: /g/TekScopes/photo/49286/6?p=Name,,,20,1,0,0 in case someone sees

I picked up this 500 MHz SA for cheap, because the CRT display is very dim, although it appears to work otherwise. I was hoping that some internal adjustments would fix it right up, but no. The unit

I believe you are asking for this: /g/TekScopes/files/Caps%20list%20updated%20March%202018.xlsx I did not verify the series information but all are high temp, long life and most are

I use one of John's extenders. Great buy. What I did was buy a plugin I needed as parts. Spent $20 on a 7a26,fixed my broken 7a26 and used the frame for the extender.

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