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Why don't you save yourself the trouble and buy a new one for $12? http://www.qservice.tv/VPASP/shopexd.asp?id=3460&bc=no Malcolm TekScopes@...> wrote:

Hi again Dennis ..I had a close look at your trace and from what I can tell a 0.3dB Peak to peak is quite possible from just before 750Mhz to around 820 Mhz. The aberration I see in David's head is

Hi Dennis: Yes...well you can see from the graphs something is amiss for sure in David's head. That 0.5dB dip jumps out at you. Tricky thing with that, without doing these flatness tests I could have

On Tue, 22 Mar 2016, snapdiode@... [TekScopes] wrote: Ammonium bifluoride + _ANY_ relatively strong acid => HF + ammonium salt of that acid. It is simply more convenient and safer to store HF in

It's about $20 with shipping on Amazon. Or even better: $6 with shipping on ebay: http://www.ebay.com/itm/331791757690

I just found this in the manual: Insufficient Horizontal Deflection If the horizontal trace starts at the left side of the graticule, but does not extend to the right side, the Hold-Off circuit is

Hi Ancel, In the test I performed there was no anomaly in David Partridge's replacement head as compared to George Steen's original head when I compared them including at 800MHz. There was a very

Sounds good but at 45$ for 47mL it's eating into my scotch budget...

Try Devcon Plastic Welder II. It's a methacrylate structural adhesive. It does not require any etching or special cleaning. Link:

Here's the link again for convenience to the PICS and the EXCEL sheet. https://www.dropbox.com/sh/jtl5xnxaw6yqstn/AADPDb4MVoZ8lbUESyORTWR6a?dl=0

I started a new thread as I did some changes to the PCB layout and changed a component value to optimize the results. Version 1.1 head! Also, the Rigol DSA interpolation of the the error correction

Going back to read the theory section was helpful. Improper neutralization can apparently cause this exact problem which is a side effect of bootstrapping the amplifying input stage to increase common

According to the MSDS, etching cream is actually ammonium bifluoride and some other weird chemicals. This has a "severe effect" on Nylon and Delrin. http://www.edhoy.com/pdf/5303_53003_53004_msds.pdf

@Albert: I ran the sawtooth signal through both Timebase A and B. There is still nothing on Timebase A. On Timebase B, it shows up nice and clear (albeit still on half the screen). However, when I

Hi Mitch, It is not clear which message you are responding to about melting points - Snapdiodes or mine. Teflon won't melt with any soldering iron I have ever had in my 45 year electronics career. I

I'm sure Chuck Harris will be posting any minute, but that's the last thing I'd use. The active ingredient is HF, which will etch glass and your fingers, but not most plastics.

That would depend on how "Butch" the soldering iron is... ;-) Mitch N4MF

It melts quite nicely at a temperature that Nylon melts at. I wonder who told me it was Delrin. Anyhow, I'll try glass etching cream, there's a local store that has it in little bottles. The idea is

Hi Snapdiode, There actually is a glue or adhesive (I'm not sure what the difference is in the terms) for Teflon. I have a roll of Teflon tape with glue on one side of it that I can stick down on a

Hi All, Just wanted to share my victory repairing my 2225. Using a bamboo skewer, I was able to locate a spot that induced the failure at will, when I pressed on the printed circuit board. It ended up