Some years ago Panasonic had low impedance series that leaked about >a year or two in service. They dis-continued this series and every >company that used them had a product liability problem.

Since then, I have stopped using Panasonic capacitors in any >>designs.. Due to the easy availability of Panasonic parts at >>Digi-key, they have become common, but they are not always the >>ideal choice. This is a marketing strategy that has worked well for >>Panasonic.

My perfered has been United Chemi-Con, Nichicon or even CDE.

The specific type of 'lytic that should be used depends on the >>it's specific job in circuit. There is not real one 'lytic does >>all. Be aware of life, temperature, specified temperature and other >>ratings before installing any replacement 'lytic.

Bernice 

--- On Sat, 7/2/11, ab1jx <alancorey@...> wrote:

From: ab1jx <alancorey@...>

I've got some 11 khz ripple in the vertical section of my 2235 so I was thinking about recapping it. I saw Rubycon mentioned in another thread, I was thinking Panasonic EEU line or maybe Nichicon. Is there one all-around best choice or does it depend on where it is in the scope?



Alan

Hi bill,
I have a couple of 465 scopes need Knobs. Can you recommend the good source for me?
Thanks,
Douglas Ho

To: TekScopes@...
From: bwebb@...
Date: Sat, 2 Jul 2011 15:43:03 +0000
Subject: [TekScopes] TEK 466 focus potentiometer




























I recently purchased a very used Tektronix 466 scope. It had a few broken knobs. I have been able to purchase replacements. So far it works great. I have discovered one problem. The focus potentiometer is stuck. It will not budge with vise grips. Fortunately it is frozen in the 'focused' position. I am wondering if the wiper is welded itself in this postion. Is this a know problem? Is there a source for a replacement focus potentiometer?



Since the trace is in focus this is not a big problem, but it is annoying.



Thanks - bill

I can send you one for free, but I am in Holland. I think it will fit a
standard letter so cost should be no issue.

Let me know if you want one.

Mendel

From: hh
Subject: [TekScopes] Problem calibration TEK 495P
To: TekScopes@...
Date: Sunday, July 3, 2011, 2:19 AM

 

Hello,

i've this problem on my Tek 495P.
When i start the calibration routine,with the internal generator 100Hhz -20 dB,the routine fails because the processor says taht there is any signal calibrator is present.
I've checked the output signal at 100Mhz -20 Db and is ok.

So i've connected to rf input an external RF generator at 100MHZ and the test start only when i give a signal @ 100Mhz 0(zero) dB.
Seem to be a loss of gain.
What can i verify in the instruments for repair this loss of gain?

Thanks for Any help.

MAX

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Hakan H
Sent: Sunday, July 03, 2011 4:05 AM
To: TekScopes@...
Subject: [TekScopes] Re: No HV on tek 465

 

--- In TekScopes@..., "J. L. Trantham" wrote:
>
> When I have tested similar diodes (although lower voltage, about 5 KV) I had
> to use a power supply through a resistor to drive the diode forward to see
> the current flow since my DMM couldn't produce enough forward voltage to
> 'turn on' the diode. Which DMM are you using?
>
> Joe
>
> -------
576 curve tracer
/Håkan

I was on vacation until yesterday, but my P7001 is still mothballed.


Dave

From: Chris Moore Subject: [TekScopes] Transistor identification
To: "TekScopes" <TekScopes@...>
Date: Saturday, July 2, 2011, 11:48 PM

 

Hi all,   I've recently acquired a bag full of new old stock transistors, but I can't find any data on them. The one I'm holding right now has a 12H on it. Underneath the 12h is 3-71, which may be the date code. They're in a can package and have three legs so I'm guessing they are transistors, but like I said I'm guessing. Please help.   Thanks, Chris   P.S. I also have some with 12M and some with 12N on them.