I've always epoxied a standard CR2032 or CR2016 coin cell holder onto the
board, depending on what's in my parts drawer at the time I needed it.
Check to make sure the spring strip for the positive electrode isn't in
danger of brushing against the shield partition when you reinstall the
board... if so, you can stick some Kapton or similar tape to the shield
wall.

-- john, KE5FX

-----Original Message-----
From: TekScopes@...
[mailto:TekScopes@...] On Behalf Of stefan_heinzmann
Sent: Monday, June 27, 2011 7:20 AM
To: TekScopes@...
Subject: [TekScopes] Battery for spectrum analyzer

Hi all,

are there any sources for a lithium battery that fits into a 494 or 494A

type

spectrum analyzer, or is it necessary to try to fit in something similar?

Cheers
Stefan




------------------------------------

Yahoo! Groups Links

From: Daniel
Subject: [TekScopes] Tektronix 2215 problem
To: TekScopes@...
Date: Sunday, July 3, 2011, 11:53 PM

 

I recently bought this 'scope from ebay and I got a good deal on it because it doesn't work. there seems to be some problem with the PSU it just makes a high pitched whine and I get no trace on the screen. I posted a video on youtube so you can see for yourselves what it's doing. what I want to know is what I should check for, where I can get replacement parts, or, where I can send this to get it fixed. I know intermediate electronics but i'm not great at troubleshooting. I'm more into repairing tube radios. that's kind of the reason I bough the scope. anyway hope someone can help me!

http://www.youtube.com/watch?v=GFPTLrw9enk

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