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Work still in progress. Yesterday I put a normal metal film resistor in parallel with the other two (R65/R68). Measured total resistance now is 1,33 ohm. OK. Behavior is almost unchanged. With +15 V

It isn't that they were selected, the 2N3055 devices at the time were all homotaxial and had low beta compared to more modern versions. Even with this in play some HV circuits were cranky and wouldn't

I'm against it. We've got the curated (and excellent) Tekwiki. Marketing campaigns don't belong on any of the wikis.

Hi Bert OK it means in my case t906. Do you have the schematic for 2230 so that we can confirm the transformer. Thanks.

No, I mean the HV supply, the one that runs off the input AC and supplies the +40V. Shorted turns make it draw too much current.

Hi Bert Thanks for your concern and suggestion. But it operates normally with external power supply (in my case I used 38v dc across tp950 and tp940). Saroj

<http://w140.com/tekwiki/wiki/Main_Page> nonIonizing EMF wrote:

Would be nice if more Tektronix related information was on Wikipedia. Thinking I can make a Tekwiki wiki on Wikipedia and maybe add on the Tektronix Wikipedia Wiki also. Looks like the following

First, let me say that I have several 223x family scopes and had very few problems with them. I did hav

Ok, but by who? You? Colin.

as the subject says, taken.

Assembly: CRT Circuit (8) New el. caps. Transistors checked with multimeter (don’t own a working curve tracer until the said 7603 is repaired. So stupid!). Read that TO-3 are factory selected and

I am interested in the scope. I have a Fedex account, so if you can drop it off at one of their locations I can take care of the shipping costs from my end. I have a specific use for the scope and it

I don't need it, but I figure I'll rescue it later today as I'll be in that neighborhood. He wants $25. You can have it for that plus whatever actual shipping is to you. I'll box it up and weigh it as

Hi Bruce, Don't get discouraged by your initial problems and spectacular fireworks. Do you have phone with an camera? Sometimes the more experienced techs can spot what is wrong from pictures. It

Steve, I guess in all the years I have never seen a semiconductor mounted via a conductive pad when connection to the thermal surface is required or desired. Usually the device is directly mounted to

Hi Chuck, I have written lots of my own monitor test routines to gather information on the ports, stack contents, set breakpoints, memory organization, etc. These are the clever tricks of the trade

Hi Nigel, The on-screen readout relies on very small currents to properly decode what letters, digits, symbols, and multiplication factors to use. It is not unusual that the switch contacts that

Hi Leo No worry. It happens. Sure I will check the component. I confirmed that the scope is still working with external supply. But before going further I want share with you my experience during the

Hi Max, I think the extra 3.9 ohm helps a tiny bit (makes the snap-off current to the TD somewhat stronger) but in my opinion its not the problem. Since at 15.5 V I suspected a wrong state of Q86/Q88