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Hi Neilsen? Could you upload some photo on those bad diodes to give some ideas how they look like? Sent from Yahoo Mail on Android

Hi Nelsen I revisit those close up photo I toke. Can see M and 9042 or 9039 labels that's all. Can't find any label with xs or xz, I assume my unit not using those problematic diodes Sent from Yahoo

TekScopes@...> wrote: ?Really? I thought it was only school kids that wasted people's time like that.? [Non-text portions of this message have been removed]

On Sat, 2 Apr 2016 01:04:50 +0100, you wrote: >On 01/04/2016 23:13, David davidwhess@... [TekScopes] wrote: >> Since any significant problems in the 7A13 will cause gross >> distortion, pulse

Some interesting stuff coming out here, as usual. Here's some preliminary results with the relay adapters in place - http://mgcsoft.com/tek/7834-7a13-20mv.png

Take a look at the schematics for the 7000 series standardizers, the PG506, and the Type 106 square wave generator. I can host the documentation to the NBS design if you would like to see it as well.

TekScopes@...> wrote: Hey David, would you happen to be able to point to a schematic of such a thing? Siggi

There is a way to improve the flatness of the pulse commonly used in reference level pulse generators; drive a 50 ohm termination through a series diode which disconnects the logic output from the

TekScopes@...> wrote: My 485 has all original caps, no problems there that I could see. It had some problems with them newfangled op-amps, and a precision 100K resistor went all weird

Using a clean pulse works great for tracking down the bad relays and any other problems in a 7A13. Since it is only 100 MHz, the bandwidth requirements on the pulse are relatively low. Since any

Battery here: http://www.amazon.com/Alkaline-Battery-20F20-BLR123-ER413/dp/B00E7XDASU/ For $13 it's not worth doing the 3 9v mod. John To: TekScopes@... From: TekScopes@...

Without the schematic to the TM506A, I cannot say what Tektronix was trying to do; the TM506 schematic shows nothing like that.

I have a couple of the old Tripplett meters like this. That 30v battery is hard to find, if at all. But I wired three 9volt batteries in series and tucked them in there. There is space for them. Just

Making measurements like this in proximity to a switching power supply can be very tricky. Leaking magnetic flux crossing between the probe's signal and ground connections will show up as part of the

Sorry guys - April Fool's - I made up the whole story. The only truth to it was that I had never heard of a 7J20, or at least was unaware of what it is. I did look it up though - looks like a very

I have 2 Triplett meters, a modern telecom one model a telecom specific Local Loop Tester Model 4, and a really old one, a 666R. That high voltage the model 4 has is used to apply 45-47 volts to a

I have two 475s that I acquired about ten years ago, and still going strong. I've never even opened them up. Ed

Ting, With all the component replacement I did on the secondary sided rails, I was not too concerned with the P-P. I did measure and record them both before and after replacement, but I did't know

Interesting. My new variant will have a external input and a internal RC schmitt trigger relaxation oscillator. The external inputs will be unterminated, 50ohm to ground, 120/82 ohms to Vcc/Gnd for 50

Another old 475 with original caps, eh? Maybe the design is particularly robust, or they got a really good batch of caps that year! ;-)