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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 no

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 course,

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 such

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, and

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 be. DaveD

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

It is easy to make an electroscope. Walk around store with your finger on the electrode and observe when you get charged. Wear a foil hat if you don't want to answer any questions.

Hi Benedikt, I've scanned about 10 pages of pencilled schematics and notes about the 1L5 modifications. I'm trying to make them useable and add schematic refs. I still want to do some explanations as

6C10s are three 12AX7 sections in one envelope. For many applications, the 6AC10 will work fine, it's three 12AU7 sections in one envelope. Not only do the AudioPhools like them, guitar amplifier

Dennis used to sell these from his table at the Ham swaps. Hopefully he will be attending them again soon.

I have 610B; we used those to measure the triboelectric charges on toner way back when laser printers were in vogue. I am surprised to find that there is no Keithley groups.io group. DaveD KC0WJN