Hello Ross, I have a 2565A that I am thinking of selling. It hasn't been re-capped (no issues there) but has had a new battery recently installed, and I have been through the recalibration procedure.

Aldue, I bought some of these: https://www.ebay.com/itm/Set-10-Tektronix-152-0125-01-4-7mA-TUNNEL-DIODES-replaces-1N3717-TD-3A-Tested/313002120835?hash=item48e0615683:g:ft4AAOSwsdJdoQL0 They are 152-0

I have a 2465A but don't have any idea where a motor like that is used. Any help?? Thanks, GerryR KK4GER

Craig, My guess would be that you got an old battery from Mouser. I purchased mine from Mouser a few months back, and it came with no date code stamped on it, so who knows how long its been on the she

Miguel, The GE Tunnel Diode Handbook (from 1961) describes tunnel diodes and back diodes and can be downloaded online. The Micro-semi PIN Diode Circuit Designers Handbook is, likewise, available. Outs

Gary, Link to where on Ebay I purchased the tunnels: https://www.ebay.com/itm/Set-10-Tektronix-152-0125-01-4-7mA-TUNNEL-DIODES-replaces-1N3717-TD-3A-Tested/312810709201?hash=item48d4f8a0d1:g:ft4AAOSws

Gary, I deleted the email where you posted the part number you are trying to find, but I have a few 152-0125-01, 4.7 ma. tunnels; they are replacements for 1N3717 and TD-3A, I am told. I used them for

Never mind, then-came-the-dawn; three different scales to get from 0 to 20 and I assume that proportionally you can try to put your values as close to center dial as possible for greater accuracy by u

If you look at the dials, each is calibrated 0 thru 10. Then there are numbers in red, 0 -20 and another series 0-5. Just trying to figure out what the different scales mean in the context of rise tim

Dennis, What do the dial scales values indicate?? GerryR KK4GER

Albert, That's great, but where do you use such an instrument. I'm trying to figure out where three risetimes, or two as the case may be, react to give me a single total risetime. It's a neat calculat

Is there a booklet that describes the workings and use of this "calculator" anywhere? Tek was always excellent with their documentation. GerryR

It must have been "Recommended Standard," because I had (have somewhere?) a book that had 132 or so versions of the RS-232 "standard" interface. That's a lot of versions of a so-called standard! Gerry

Is there a Tek part number associated with this unit? How is it used to calculate rise time? Thanks, GerryR

Hello Joseph, Did you remove the internal battery before / after adding the external battery? The Test 04 fail probably means your calibration data is corrupt, and once you have replaced the NVRAM, yo

Jeff, The Test 05 Fail 44, according to my manual, indicates that the "negative level too negative" and "positive level too positive." The test indicates a "Main Board Failure Detected by Auto Level T

The high-amplitude output is used to stimulate the Tek tunnel diode pulser for Vertical Transient Response calibration. The unit I made to replace the Tek Pulser operates at 10 V, so I didn't need the

Jose, You need a good frequency generator to replace the PG506 calibration generator and a good pulse generator (variable duty cycle and fast rise time) to replace the TG501 Marker generator. The puls

Jose, I have the 2465A and have been through the calibration procedure a few times due to the fact that I messed up when trying to change the battery backup module, which I believe you do not have on

One of the calibration procedures produces those series of dots when setting the vertical limits, if I remember correctly. It would appear that whatever initiates that procedure is somehow "stuck on."