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I as well can attest that the feet turned out great. I bought and put them in service on a 7834 and TM-503 both of which benefited greatly as I like this cord wrap design far and above the originals

The real question is why DON'T you see the 7A26 noise? IF (and that's a big if!) the input impedance of an amplifier were purely resistive then the thermal noise contributed by the resistor (Vn)is

Hiya Tom ! Wish you a wonderful New Year ! I have now 7 Teks working flawlessly, plus a dozen of plug-ins for my 7904's. (I have some Philips too...). The only which will be out of rescue is a 2213

I have done some work on the 2213/2215 (with prereg board), 224X A and non-A, 2232 and now a 2235A. All these scopes use the saturable transformer, if I am right, and, for example, the 2213 use the

Gang, Here are some pictures of the 3D printed feet Tim created; http://groups.yahoo.com/group/TekScopes/photos/album/1580745225/pic/list I am very happy with the results. Goerge

Hi Priya I have followed every discussion of 22xx and 224x scopes on Tekscopes for years, and I do not remember much talk about base resistor problems. But I do think you might be on to something

That's right. On the 2246, the pre-regulator 44 VDC needs the inverter circuit to be functioning correctly to get to a stable 44 VDC because of the Q2008 feedback from the inverter FET Q2214 Drain

I would add -- Tim was kind enough to send me one of his prototypes so I could use it to make a mold, and compare my castings from his prototype vs. an original foot that Tom Jobe sent me. I owe both

I bought some and they work great. I plan on posting some pictures, but have not got around to it. Tim's Email address is; lemonscentedmoisttowelette@... George

I'm interested also…. 6 connectors???…. to make 3 extenders…. solid pcb inside the scope, then wire outside i think…. shielded microstrip inside to smb panel mouts, then smb coax to socket…

Yes that's right. Inductor L2206 limits dI/dt and helps to collapse the voltage across T2205. I have just a few different 7000 'scope types. You may well be right there. The surprise for me was that

On the 2230 which uses the same basic design, the preregulator output is fixed. On the 2246, it looks like Q2208 adjusts the preregulator output to keep the same voltage across the switching

I saw him offering those on ebay along with the handle endcaps. they look very nice. Search for tektronix feet and it should come up. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. |

wrote: Isn't the 2246 inverter design just another variation of the saturable core oscillator with T2205 designed to saturate before T2204? I see the same configuration in the "good" 22xx series (2230

You are right. At first sight I thought that the 44 V would be regulated independently always to that value, but it's not. This also destroys my argument that the sum of saturation voltage and FET

I think if the designer was concerned about the switching time, then they would have used some sort of active saturation control like a Baker clamp. I would be tempted to

No, there's no 608C manual there, only a Service Note. I have a photocopy of a 608C manual; if you still need it, contact me off-list and I'll scan it as time permits. Dave Wise

Hi Dave, The 150ps versus 200ps difference is in my view only the result of the better RF-environment of the new relais(design) in the 015-0611-00 Pulse Head. I have both BNC Pulse Heads (311-01 and

There is something strange about those switching transistors. I just looked in more detail in the 2232 manual. There the base resistors are 33 Ohm (!) but still 0.2 W (!). Same transistors,

<daviddigiacomo@...> wrote: The difference in noise between the 7A19 and 7A29 should be there (maybe about 30%) but it will not amount