Hi David! Have tried to adjust the Edge Focus (R1864 on the HV board) as described in the service manual? -Gregor

Thank you Dennis Regards, Stephen Hanselman Datagate Systems, LLC

The TekScopes archives are readable by members of the general public. Recently a message was posted to TekScopes that is not a reflection of the other 8,000 members of TekScopes. Many members have

Thanks guys, I thought it was probably normal, but it doesn't hurt to ask. Another problem I'm having is front panel Focus adjustment. Went through the adjustments in the service manual but still

Yeah, I wondered about this. It looks like the collector of Q1852 will go between approximately -100V to -200V depending on the focus pot setting, but unless you're moving the focus pot, the output is

I doubt that the capacitor was damaged by the circuit in any way. There really is little voltage and almost no power there. More likely is it was just a manufacturing flaw that finally manifest

Thanks for the congratulations! :) To answer the question about C1813, it has degraded to about 1nF and should have 22nF. I measured it with the capacitance meter of my multimeter, and it gave me that

Probably noteworthy to mention that on the 2465B those filter caps (C1812 and C1813) seem to have been upgraded from 0.022uF to 0.047uF, and two additional parts where added for further filtering in

4 star electronics show 175 in stock.

Wow so fast, thanks a lot, I will now do some signal checking on the pins. Simon

Dual TTL-ECL level translator gate https://4donline.ihs.com/images/VipMasterIC/IC/MOTO/MOTOS13078/MOTOS13078-1.pdf?hkey=EC6BD57738AE6E33B588C5F9AD3CEFA7 Bruce

I have a faulty frequency counter (not Tektronix) which has some obsolete Motorola ICs. There is one that I suspect : MC1217L, a 14 pin DIL which I think is a Motorola ECL device, but I cannot find

With further investigation I have concluded that TIME cursors look like they are measuring pretty spot on. With a 1kHz signal it, in fact, measures 1.056mS which is correct. At 10MHz the measurement

Good find Gregor! I was following this topic for a few days because HV problems are always interesting. Congrats and thanx for the detailed explanations with pictures, René

Turns out there was a fault in the 177 that was causing the issue. I will need to look at this 177 very closely. the 577 it seems is ok.

Congratulations! yahoo.com@groups.io> wrote:

Not sure which type is in the 465, but Linear Systems does sell various equivalent dual matched JFETs for types used in other Tek instruments (specifically 603/604 XY's in my case) and they have been

Do I take it that C1813 was open-circuit? ________________________________________ Sent: Monday, October 12, 2020 1:52 PM To: TekScopes@groups.io Subject: Re: [TekScopes] Tektronix 2465A noise on

I was able to acquire a spare op-amp from a unit that has yet to be repaired but I have some replacements on the way. I am at step 15 of the calibration document. And when I hit the invert switch my

Great job, Gregor! Persistence wins again. Glad you restored that nice scope! -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA