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A note for the archive. Telonic Berkley, makers of the RF Attenuators often fitted to the 7L12/13/14 SA still exist. For anyone with a (partially) duff attenuator they can supply replacement chip

Tarnex is the best I have found if you want to be quick and consistent. I think the amount of metal loss is trivial. Rinse and neutralization are key. Most all of the ‘wives tale’ methods of

http://sfbay.craigslist.org/eby/ele/3637029844.html Just saw it... FYI, Dave

Thanks for the advice. All four channels looked reasonable and I didn't notice any non-linearity, but I only spent a few minutes with the scope. I'll get methodical next. I did notice some crosstalk

Does anyone knows a source for the service and user manual of this instrument (Datatek video sweep generator model D631)??? Thanks in advance, Max

I would start looking on schematic 6 since the vertical drift affects everything. If it is a failure in U600 or U400 then there is not much to be done but there are other possible. The channel switch

Have you made any progress on this issue? I just received a 2465b today and it does the same thing after warming up for a while. Good luck! -Scott

If you can get to all of it, a pencil eraser actually works pretty well. It would be tougher to get around the base, though.

I just received a 2465b and it seemed fine on my initial check. However, after leaving it on for several minutes, the readout and display started to drift up and down. At times, the top of the readout

Good point! ?I wasn't really thinking. ?They likely are mostly silver since they tarnished black. ?Nickel will probably go greenish (or perhaps that's from the copper underneath that oxidize on a

Hi Dan. On all the TE I have, the connectors appear to be Silver plated. You could (!) carefully clean them with "Tarnex" liquid. Then clean off that stuff with Windex, etc. Most of the time, I simply

Hi folks, ? I am sure this has been asked before, so please point me to the correct links if so. ?A quick search of the archives didn't find anything easily. ? How does one clean the nickel-plated

Very nice!

Thanks for that Mark. Another tool in the box. Dave Sent from my iPhone

On page xx of the preface: http://w140.com/logichandbookmar67_tek567.jpg

I have these almost since they were new and now need to find a good home for them both. The tubes are good nice sharp traces, but the 585 needs a HV cap replaced, and the 535 is slow to warm up..I

I would be happy just for some power good L.E.D,S and maybe test points for the transistors. Regards Dave

I tried responding and got a message from yahoo.com saying account disabled or discontinued.

Hi Chris, You are almost there. Pl read page 3-45 which explains how the circuit operates. Put the large 87 volts schematic in front of you. Look at resistor R1228 and R1227. Check that they are

Ok, I replaced Q1221, Q1222 and Q1223. I also verified R1212 while I had it out. Still no go - I tested all 3 transistors with my DMM and they all look like they're good. Where do I go from here?