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Look up CG551AP on Tekwiki, 'programmable calibration generator'. It refers to the two heads and has a link to a manual, less schematics. Roger

Not certain what these probes are: Tektronix Comparator 015-0310-01 & Pulse Head 015-0311-01 for CG 551 AP ? Have not yet located .pdf's yet. Came in a box with other purchased items. What is the CG

Hi Stan, Always allow a safety margin. I would specify 50V caps in this case as long as there is room. There are many reasons why you need to error on the side of caution. Several of the most

More unambiguous: the blocking oscillator frequency was 200 kHz, giving 5 us slots for each channel. The multivibrator repetition frequency was 100 kHz.

I tried a BC557B for Q260 (checked for Vceo >> 40 V). Does the job, both in ALT mode and in CHOP mode. The chop frequency was 100 kHz now as I could see when I set the 3B3 for 5 us/div and triggered

Thanks for the topic, I have a 7CT1N that's not working right! I have not got to dug into it yet to find the problem. After reading this, I checked those cap and resistors. Two 100uf 25V caps! Need to

looking around, the 155-0078-xx is not that hard to find now. sphere has some, and a few on ebay (poland, uk). even some NOS. they can be pricey but i would not call it unobtainable. if you find you

In ALT mode both base and emitter of Q260 are tied to -12.2 V through resistors. For Q 260 to enter in conduction it is required a voltage swing (on emitter) of 0.2/0.3 V (germanium) minimum. Using a

(BTW you mean the sync signal, not the blanking signal.) In the 2B67 the Sync levels at pin 4 are +110 V and +125 V. Suppose you used a 2B67 in the left slot and a 3B1 in the right slot while pins 4

A heavier oil will resist being thrown off but one thing I have noticed recently on some old fan bearings is that thoroughly cleaning the old worn bearings with a solvent before adding new oil helps a

This brings up a good point. Also keep an eye out for sales of 500 series oscilloscopes which include the 1A4 vertical amplifier plug-in. There is a lot of old aerospace equipment hanging around the

Zetex wrote an application note showing series and parallel connections for avalanche transistor pulsers for higher current and voltage.

The only thing making this difficult to do is the physical form factor. Shorting one input turns it into a single ended probe equivalent to a 100 MHz active single ended probe albeit with greater

That makes sense. Tekwiki even has links to quite a bit of documentation on these plug-ins.

OK, an H-K short would not do what you have, pins 1, 2, 3 and 4 are at nearly the same potential so that isn't likely to be it. The next grid is at a quite different potential but with the CRT

The incorporation of F240 and F241 was only implemented after 575 serial numbers 8030. I did not have them installed in my 575 when I bought it and it cost me a bundle to get the scope operational

There was no problem, except tektronix installed 25V caps on a 35V line. It is recommended they be changed... In 1985. So I changed them in 2018. From Tekwiki http://w140.com/tekwiki/wiki/7CT1N "C30

The diode bridge protection circuit is used in the 11A71, and also inside the M377 chip, which is used in the 11A32, 11A33, 11A34, and 11A52.

CORRECTION : At all ranges on channel 2 except 100 mV/div.

If nothing else I found out a few things. First of all for some reason they use the shield of the coax cable for the blanking signal. The reason for that is a mystery. Why they reverse the connection