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There is an extremely effective do-it-yourself solution to the high prices on eBay for GHz probes like the P6056 and P6057. Douglas C. Smith describes how to make your own out of readily available (at

No worries, thanks! I'll have to get it on the bench again, but I have a question. When you say "pot's own setscrew" is this the one that is in the broken plastic bit or is there another one I'm

The old adage "if it ain't broke don't fix it" applies here. I wouldn't go recapping it or rebuilding the scope unless it was absolutely necessary. The only problem I had with my 556 was the dreaded

Hi Bill. As owner of some 556 scopes I have had some experiences during their restoration. They are pretty well engineered and I would say ultra reliable. The only area I would caution about is the

I made a deal to buy up the Tek spares stock of a closed service center in europe last month, in order to get some hard to find 155 and early 156 parts. I have gone through them, and will be posting

Cool Tom. Thanks for that, though I'm still only understanding about half (generous) of what you're saying. It will contribute as I continue to study though. The insights to the purpose of the

I would do that, except for one small problem.? I'm using EAGLE 7.x with a hobby style license.? I am specifically prohibited from selling the boards.? Now, if I could guarantee that nobody would

Right side of the scope, A8 board. There are 4 right in the middle of the board. You should probably be able to see the silk-screen notes for (top to bottom): B FIRE, B ARM, A FIRE, A ARM along with

Hi Harvey, If you're not considering selling them, have you considered to just make the gerber files available online (let's say github)? A lot of people now regularly buy PCBs from JLCPCB or pcbway.

I've got a 465 and I didn't know there were any tunnel diodes in it. Where should I go looking for it?

Hi Dave, That network provides temperature compensation of bandwidth. A peaking capacitor (a trimmer) already exists across the emitter degeneration to boost bandwidth. The varactor in parallel

That should have been 1 mA. Raymond

On Sat, Apr 3, 2021 at 09:22 PM, Dave Peterson wrote: > > It looks like +55v only goes to the bias supply of the CH1/CH2 first stage > amplifier. It is immediately stepped down to about +5v by an

CR39 is a 1mA current regulator, or constant current diode. It is a high impedance device and will not function at (15 - 4.2 = 10.8v). It supplies bias to CR34, a vari-cap that is part of the

Can someone here explain the purpose of the +55v source to this circuit? I'm am trying to see if I can power the vertical assembly on a bench. I have a very dysfunctional vertical assembly, and would

Congratulations Jared. Important quality aspect is lack of noise in the most sensitive DC ranges. Well, being not that good in color distinction I asked my wife for assistance., I'm glad we didn't

Both effects are present in my opinion, shift between alternate sweeps and chop noise. I added a picture "A17 noise" that might convince you. The noise frequency corresponds tp the chop rate (judged

For those with a 2465A (or maybe B) version; I just received a 2465. Very clean and good looking inside; probably heavy usage, though, considering the status of the blower: noisy. Another thing I

OMG, I am a happy panda! I connected the wires as below and it works! Not bad for a $160 gamble on this probe. :) Luckily my coax (The clear-ish wires) weren't broken so I didn't have to worry about

Wow, thanks for that! There's no way I would have got it correct..... I saw your picture at TekWiki and mine matches there, so I'll rewire my Amphenol plug to match yours and see what happens. Many