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Hello Dennis, You said: "Tek engineers know this and design for it." If that is so, how come that there are massive failures of tantalums in 465, 7854 and other scopes.

In the auction the seller does his job trying to sell his merchandise. If the data in NVRAM are lost you can always resort to a friend with the proper tools for the calibration of the instrument (the

Some oscilloscopes like the 2232 and I would guess the 2224 and 2221A do not store any calibration information in their NVRAM but do store the oscilloscope's configuration there. If the backup

Richard, Following up on Bob's comments, check if the scope has been modified to silicon diodes, or does it still have the original selenium plate rectifiers? There was a mod kit to convert the

I saw the auction but his statements are contradictory. He does have a list of scopes that he claims do not keep calibration information in the NVRAMs and he says there is no need to save the contents

Thanks for the reply,Im checking the Caps. and Rectifires this week. I would like to put new ones in. Does it matter if the uf and the voltage is a bit over rated? If the low voltage side seems

Here is another choice, http://www.fairchildsemi.com/ds/KS/KSA992.pdf? Vcbo =-120V, Ccbo ~ 2-3 pF, Ft ~ 100MHz. (Mouser 7 cents each!) -?George ________________________________ To:

Both of the ones I listed are available from Mouser. The 2N5401 and 2N6520 both have a Cob of 6.0pF maximum at 10 and 20 volts respectively but Cobo falls with Vcb so at 60 volts it will

You all may be interested to know that an Ebay seller of "Tektronix battery modules" has a list of models which (according to Tek, he says) do not store cal constants in either the NVRAM or the

It was at the Ft. Meade base in Maryland. Peter

I may have missed it... but did you check all of the low voltages, and the ripple on each of them? tom jobe...

Looking on eBay now. 2N5401 is 6pF max instead of typical. NTE2634 looks good although it's a TO-126 package. Only 2pF! $1.38 free shipping. NTE2502 maybe too. Dave Wise

And we need to see the beginning of the sweep (i.e., the trigger point). Right now, I'm thinking it's off screen. Move the trace horizontally to the right so the sweeps starts about a half a

Is the scope's 10X Magnifier on? I cannot tell from the video. That would make the gitter of the sound card look 10 times worse than it really is.

I have a working 5103N populated with three plugins for sale, in southern California. No manual or probes. Anyone interested? It need some cosmetic TLC but functionally seems fine. Bright, clear

MPSA92 is the only through-hole hit at Mouser, but I think Cob is too high. A couple of SMT parts are 4pF vs 6. FJX99T, 2SA1312, and 2SA1136. Dave Wise

Thanks Larry! It is amazing what we can learn by following the discussions on Tekscopes. I had no idea that this many transistors were available for higher voltage applications. It will be fun to see

6pF typical vs 4.5 for 2N3906 vs 2.5 for 2N2207 . Dave Wise

Comp PNP should be MPSA92 / 93 -ls- "Tom Jobe" <tomjobe@...> wrote:

Hi George, Those NPN transistors are a nice find! Thank you for the link to the datasheet. Is there a PNP version? I think that is what they are looking for. tom jobe...