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Yes. That's it. Thanks, Sigur?ur. Barry - N4BUQ

Maybe you’re talking about Robin Renzetti: https://www.eevblog.com/forum/testgear/tek-7603-scope-w-7a18-amp-7b53a-timebase-restoration/ . ?ann sun., 5. maí 2024 kl. 21:25 skrifa?i n4buq via

Hey gang, I know nothing about these scopes that I inherited from a retired EE professor that recently passed. He was quite fond of them and I want to see if I can find a home for them. They

Berzerk <crayzeemf@...> added the photo album FS: 500 series ( /g/TekScopes/album?id=294904 ) --- The following photos have been uploaded to the FS: 500 series (

I remember the same sentence, just calibrated for? a higher bandwidth, which suggests less flatness, IIRC. Harvey

I found a better explanation in the Operators Manual: Option 9 Adjusts vertical circuit performance to extend sine-wave response to 250 MHz (upper -3 dB) when 7A19 is used; +15° C to +35° C. So

Tekwiki states: Option 9: Extended bandwidth (250 MHz, trades pulse response) Is that the reference you were talking about? Thanks, Barry - N4BUQ

As I recall, it was all done with a greatly relaxed transient response. Compare the overshoot specs. The hardware is the same.

How do you make one? <jspencerg@...> wrote:

Hi Harvey, That's been my belief as well. Years ago a friend and I compared our two 7704A scopes, one with opt. 9 and one without. We couldn't identify any obvious differences in circuitry. Of

I just spent a little time going through the (printed) manual. Mine's revised as of 1981 and does cover the option 9 scopes. I don't see anything on the schematic about option 9.? Easy to miss,

About a year or so ago, I found a website (possibly youtube video) where the guy performed an electric and mechanical restoration on a 7000 series scope (I think it was a 7603 but possibly 7613, 7623,

Does anyone know what was done to the 7704A for Option 9 (250MHz BW)? All I'm finding is the definition but not what changed to accomplish that. The sticker on the back of one of my 7704As states

The Type 549 uses a 6GF5 in the HV supply, also the "almost" compactron 8608 in the vertical output section.

The 6AC10 has an amplification factor of 62 for each section (like a 12AT7). The 6C10 is 100, as you pointed out, like a 12AX7. They work perfectly in a Heath HO-10, probably in other instruments,

I recently got a 453 that needed some work to get going but it’s missing the rear cover plate. It’s an early one that has a separate power cord. If anyone has a parts unit that would let just the

You could also upload them to TekWiki at https://w140.com . Regards, Dave Wise ________________________________ Sent: Sunday, May 5, 2024 2:56 PM To: [email protected] <[email protected]>;

I hope so too, I have a 575 that I want to set up as a dedicated tube tester. I’ve been watching this thread with great interest. Haven’t found a decent 576 that’s affordable yet.

It took me a very long time to find an original manual and probe for my 610B electrometer. I was thinking of starting a Keithley group but it's hard to gauge how much interest there would

Yes, I'm surprised about the lack of traffic on forums and YT about the old keithleys. I have working 2000 dmm, 236, and 610C units. I am getting into the fix with a 619. I was lucky to get a printed