Big Cap for 465M


Earthlink <billbrobeck@...>
 

I believe the big 18,000mf cap is bad on my 465m scope. The part number is
290-0508-01. I'm looking for a NEW one since getting into it is going to be
a bear!. Can anyone direct me to a generic part number. Digi-Key offers alot
of 18,000 mf caps, but I don't know which kind to get.


Thanks

Bill Brobeck


Earthlink <billbrobeck@...>
 

Thank you

I went ahead and found a replacement from digikey for about $5 + S&H. The
neat thing about it was

1) I got a 105C cap
2) its allot smaller so I think it should last longer being farther away
from any warm things in there.
3) it was pretty easy to solder in

Things to look out for

1) those darn horizontal and vertical "plugs" underneath that coil of coax
on the vertical amp board...who designed that blasted layout!?! Jesus, what
a pain!!! one broke off....the manual does not jump out and tell you
exactly where those plugs are located...resoldering was abit inconvenient

2) When subbing for a old metal cap be sure to put in any required jumpers
from the vacated solder points. Those tek guys used the cap cans to get from
one side of the board to the other.


Bottom line

$50 for the scope from ebay
$6 for an OK CD manual.....impossible to read test voltages
$5 for a new cap
$70 for a pair of 10x probes from Master Probe ( I paid more for the probes
than the scope <G>)
-------------------------------------------
It all works great!!!!!


Many thanks to those I contacted regarding where to look

Bill Brobeck

-----Original Message-----
From: Stan & Patricia Griffiths [mailto:w7ni@easystreet.com]
Sent: Saturday, November 15, 2003 3:50 PM
To: Earthlink
Subject: Re: [TekScopes] Big Cap for 465M


Hi Bill,

I found a replacement 290-0508-01 in my salvaged stuff for you. I measured
the C and it is OK but I do not have a setup to measure ESR. I have no
reason to think it is not good, however. Since this cap is the same Tek
part number you need, I am sure it will fit. You can have it for $5 plus
shipping. Let me know your shipping address and I can send you a quote
that includes shipping and payment instructions.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Earthlink" <billbrobeck@earthlink.net>
To: <TekScopes@yahoogroups.com>
Sent: Friday, November 07, 2003 2:17 PM
Subject: [TekScopes] Big Cap for 465M


I believe the big 18,000mf cap is bad on my 465m scope. The part number is
290-0508-01. I'm looking for a NEW one since getting into it is going to
be
a bear!. Can anyone direct me to a generic part number. Digi-Key offers
alot
of 18,000 mf caps, but I don't know which kind to get.


Thanks

Bill Brobeck





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Earthlink <billbrobeck@...>
 

In this case I had to add a jumper and BTW it was the second jumper
added....from a previous repair someone added a jumper where another can had
been substituted by a new smaller one....but back to the pcb...maybe these
are not from one side to the other but definitely required....

-----Original Message-----
From: Rolynn PRECHTL K7DFW [mailto:k7dfw@clatskanie.com]
Sent: Saturday, November 15, 2003 11:22 PM
To: Earthlink
Subject: Re: [TekScopes] Big Cap for 465M


2) When subbing for a old metal cap be sure to put in any required jumpers
from the vacated solder points. Those tek guys used the cap cans to get from
one side of the board to the other.

Unless they are damaged in the removal process the holes in the ECBs are
"through-hole plated" and shouldn't need any help with jumpers. It's an
expectation that they are connecting one side to the other and if not,
something has happened to them. Not a criticism but a FYI.

Rolynn Tek Bvtn & Sunset 1966-1971

..._._


Miroslav Pokorni
 

Those holes for big tabs found on electrolytics get heated quite a bit
during cap removal and mechanically abused. Chances are more than 50% that
feed-through hole will break. I would say, adding a jumper is a good
defensive measure.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Earthlink" <billbrobeck@earthlink.net>
To: "Rolynn PRECHTL K7DFW" <k7dfw@clatskanie.com>
Cc: <TekScopes@yahoogroups.com>
Sent: Sunday, November 16, 2003 11:43 AM
Subject: RE: [TekScopes] Big Cap for 465M


In this case I had to add a jumper and BTW it was the second jumper
added....from a previous repair someone added a jumper where another can
had
been substituted by a new smaller one....but back to the pcb...maybe these
are not from one side to the other but definitely required....

-----Original Message-----
From: Rolynn PRECHTL K7DFW [mailto:k7dfw@clatskanie.com]
Sent: Saturday, November 15, 2003 11:22 PM
To: Earthlink
Subject: Re: [TekScopes] Big Cap for 465M


2) When subbing for a old metal cap be sure to put in any required
jumpers
from the vacated solder points. Those tek guys used the cap cans to get
from
one side of the board to the other.

Unless they are damaged in the removal process the holes in the ECBs are
"through-hole plated" and shouldn't need any help with jumpers. It's an
expectation that they are connecting one side to the other and if not,
something has happened to them. Not a criticism but a FYI.

Rolynn Tek Bvtn & Sunset 1966-1971

..._._