Ernesto wrote on 5/2/2020 3:35 PM: Hello, Ernesto-- C401A and C401B are listed as 2X20 uF, p/n 290-036. C430 is listed as (2X20 uF), p/n 290-037 C431A and C431B are listed as 2x 20 uF, p/n

Maybe check the emitter resistors. Any variation in current through these will give a difference in vbe between 'disassociated' emitters that don't have the same emitter current. The one

good to know, thank you for clarifying that

can confirm, the slower plugins are good in the faster frames I too am a big fan of the non storage 5400 scopes

Thanks.  What I was remembering is that there's a different keying from the 5400 frame to the 5000 frame.  Didn't know that some were transplantable.  I'll have to get my 5000 and 5400 frames up

OK, you made me look. I downloaded the SG503 manual, and in the schematics I don't see any problem with Q190 - it's just a dual-emitter RF power transistor.. You should be able to replace it with a

Hi, 5000 plugins do fit and work in the 5400. But not the other way around. Of course the bandwidth is limited by the plugin and no readout. I have some 5000 series plugin such as the 5a14 or the

Hi Ernesto, In my 7A13 the usual problem with the relays is of more concern to me. But I'll have a look at C518. BTW I might also have used a 7A13 in a dual input differential way to compare say E1

Nope.  The 5000 series, TM500, and TM5000 series use 0.156 spacing connectors, the 7000 series uses 0.1 inch spacing connectors. Harvey

Doesn't the 7000 series use the same card edge pitch as the 5000s? The inexpensive JAMMA cables work fine on 5000 gear.

Hi Chuck, Thanks. I'll take care of this right away. Dennis

Hi Albert, You gave me a good example of the use of a 7A13 differential comparator. I put away my 7A13 after it was disabled by the blowout of C518, a tantalum cap on the +15V. You may want to

This and other 'vintage Tec probes - ebay Tektronix probe P6101B 300V /15 MHz X1 Item number: 164183026131 Tnx- Graham

Hi Brad, Another question is why C401, which has identical description as C430 and C431, (2x20uF, 450V, -10%, +50%), has a different part number. Maybe the Tek engineer was also a unique artist,

Dear John, Any chances to still buy a 7000 series (or with somewhat lower priority a 5000 series) extender from you? I would love to fix some modules, but you last post this is already from

Today I repeated measurements but now at 50 kHz and using a 7A13 in the (same) 7854. I set the 7A13 for comparison of one 10X probe with a DC reference -18.5 V (about the average E voltage) and

Hi Shailendra, Nice to talk to a former colleague expert in these interesting and ingenious early data processing machines. I didn't forget the dynamic timer, which you correctly identified as more

In such a case I would assume that the original part was marked or sold that way and so it was the safest way to describe it. What are the markings on the part? Does the parts list give an expected

https://i.ebayimg.com/images/g/MSkAAOSwhOxZ7597/s-l1600.jpg

That 50 kHz ripple will come from the HV oscillator. I was thinking of overload on the DC -12 V heater supply when the 3A72 is inserted. Such would at least reduce the deflections. But I understand