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Wow! I had one of those in a box of tubes that was given to me a few decades ago, and I couldn't figure out what it was. That was before there was much of a WWW or Google, so the searching I could do

The 7704A CRT is the same as the 7904 CRT, but the 7904 requires a custom matched set of terminations. A NOS 7904 CRT comes with them. This all assumes my memory is up to snuff.

I had an old Marantz that had the exact same issue. The Glue decomposed and attacked the PCB.

Jerome, The bouncing is completely normal. As the unkown capacitance approeches zero, the beat frequency decreases to a value where the meter indication is not smooth and the meter needle bounces up

300MHz is likely the equivalent time bandwidth for repetitive signals, whereas the figure below is for single shot David

Hi, That is the analog bandwidth, you can display repetitive signals in sampling mode. In my practice, I was able to display and trigger up to 700MHz, obviously with much reduced amplitude. So the

That brown stuff was probably white to start. I remember there was a rash of problems across a lot of gear from some type of hard white adhesive that would 'cook' and age with time and heat and

As you might have guessed, it is rare to find one that is truly NOS, and even rarer to find such a beast at a cost that doesn't have to be expressed in dBdollars to avoid sticker shock. To increase

The 2440 does 500Msamples/s on each channel simultaneously, so 2nsec between samples. You can use your favourite formula to turn this into a single shot bandwidth, the numbers seem to have changed

I'd like one too but down here in Australia the prospects are even bleaker. I have one perfect 7904 and another that's got a dud CRT that will end up as a teaching exercise and parts mule unless a CRT

I changed my mind. I think I'll keep the scope. Bob

So I know its a ludicrous question, but, I want to ask anyway. Are there any NOS CRTs that ever come up for the 7904 ? I am asking because I am in the middle of a _major_ restore to new, complete

Thanks for contributing your data, Michael. Yours lines up well with mine. I have little doubt that Bill Turner and his gang had fits trying to meet spec -- it's worse when you're almost there, but

Uploaded a few photos on the new 549 'scope I recently acquired.

The following photos have been uploaded to the 2712 VR ( /g/TekScopes/album?id=273639 ) album of the [email protected] group. * 2712 VR-3.jpg (

Not 1.6 Hz, 1.6 kHz. Fingers not working.

Hi Alfredo, I had a hard time re-aligning my late model 2712 after battery failure and a systemic gain loss after a friend accidently put 50 watts at the input. I thought the input attenuator had

Took the great advice I received from you gents, and have finally gotten the 130 to register. Have not got it straightened out completely, but I can use the S-30 to cause the meter to deflect. After

A related cap story from just last week: I was checking out a Yamaha A-700 hi-fi amp (circa 1984) which had not been used in many years. Opened it up to clean out dust and such, and noticed 3 or 4

Rogerio, From working on or restoring test equipment, audio, TVs and radios (receiving/transceiving/transmitting), I will replace the electrolytics with new. Some types can be replaced with film,