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1. The 7934 CRT in non-storage mode is definitely not as bright as a 7904 CRT. 2. *Which* storage mode? They operate very differently. 3. Do you have the operator's manual? If so, read it

I'm looking for advice on current probes.I need a probe (or two?) ?that's compatible with standard Tek scope inputs (7k, 24xx, etc...).It should be AC and DC capable and capable of going from a few

Hello All, I am noticing that as my 7904 is warming, the trace dims. It does this about 3-5 mins after power up and does so all at once. In other words, it is not gradual dimming. I need to

I sent you an email to the email address that you used to register on this group. Thanks, Dave

On my 7834s, I found that doing the z-axis and storage calibrations made a significant improvement in the storage CRT performance. While burn in is visible in storage mode, it does not seem to have

On my 7834s I thought the CRT image was pretty good until I got my 7904 and 7854 but I was used to 100 MHz oscilloscopes like the 22xx series.

The 7934 is only closely related to the 7904A. They use mostly the same major integrated circuits including the channel switches and vertical CRT amplifiers. The 7904 is closely related to the 7834,

Here's what I reported about my experience with a 7613 a while back, from message #95110: "I also managed to get the controls loosened up enough to function. Unfortunately though, it looks like

[TekScopes] wrote:

P { margin-bottom: 0.21cm; }I recently was given a 7934 minusplugins as 'spares or repair' and was surprised to find that innon-storage mode everything that I have tried so far works perfectlyand the

Hi Michael, Thanks for the recommendation on Bourns. I ordered enough to replace all of them in the scope since I have found three bad. I suspect the 50 ohm ones in the .2 mv circuit were killed by

n4bos@... [TekScopes] wrote: The oil is to keep moisture out. My preference is genuine Bourns parts.

UPDATE: Well, the scope is MOSTLY fixed.... Turned out the reason I didn't have sweep was R740, (A Sweep Gain) pot was OPEN. I replaced it with another 1K pot and the sweep was back. Then I set

Meh, in any case, if you get the dreaded trace deflected off the CRT and you can't get it back with the controls, the input dual FET might be bad. If it is, apparently 2x 2N3819 TO-92s glued together

Thanks for the information everyone. I'm fairly new to this group and it is amazing the level of knowledge here, I have a lot to learn. I picked up a couple Tektronix P6047 probes to match the 454

I was recently helping a friend troubleshoot a Tek PS280 that he had bought on e-bay. In the process I found a fault which is design related and may be more common. The symptoms were that the

I have replied to similar messages in the past. Peter’s reply is right on. To get the best performance, higher bandwidth scopes with 1 Mohm inputs need the probe to be designed to counteract the

Hi Tom, At this point, I have trigger but the actual sweep seems to be a bit flaky. I had a nice trace for a while but now I have just the trigger as seen by just flashing dots on the screen. Now I

Hi Steve, Congratulations on a successful step in your 2215A repair! I do not have enough knowledge to properly comment on the transistor question, but my guess is that the choice of transistor is

Bump... Did you repair the 1A4? I have to repair mine now... I need some success stories.