|
Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
|
Thread Tools |
14th Aug 2022, 11:41 am | #1 |
Octode
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
|
Tek 1502 TDR - loss of trace
A wonderful piece of equipment, capable of operating underwater! So I've never attempted to remove it from its case... unitl this weekend, when switch-on resulted in no trace - nothing.
It turned out to be couple of 100uF electrolytics, both on the "raw DC" side of the 10V regulator. They must both have leaked something which caused the -ve leads to competely corrode o/c. So if this happend to anyone else, it's C6525 and C6429. They are effectively paralleled via a 100uH choke. The rest of the inside looked like it just came out of the factory John |
14th Aug 2022, 1:22 pm | #2 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,639
|
Re: Tek 1502 TDR - loss of trace
Interesting bit of kit John, can you still get the graph paper? I see the mains tfmr is made by multicomp not Tektronix, I thought Tek always designed and wound their own tfmr's.
Andy.
__________________
Curiosity hasn't killed this cat...so far. |
14th Aug 2022, 1:54 pm | #3 | |
Octode
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
|
Re: Tek 1502 TDR - loss of trace
Quote:
Not sure about the paper. Lots on the roll. I'm pretty sure they did design the tfmr, they must have sub'd the manufacture. |
|
14th Aug 2022, 2:08 pm | #4 | |
Dekatron
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,942
|
Re: Tek 1502 TDR - loss of trace
Quote:
But since they have gone to paint the pearly gates in Tektronix blue, the source of expertise and spares has totally dried up. Craig PS This might be worth a try. Also Beaverton based https://vintagetek.org/
__________________
Doomed for a certain term to walk the night |
|
14th Aug 2022, 7:36 pm | #5 | |
Octode
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 1,706
|
Re: Tek 1502 TDR - loss of trace
Quote:
David |
|
15th Aug 2022, 10:15 am | #6 |
Octode
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
|
Re: Tek 1502 TDR - loss of trace
David: I'm pretty sure you're right: they feel too heavy for aluminium electrolytics. All the other "canned" caps on the supply are glass sealed, but these two have a black hard-rubber-like plug. I've also managed to identify the WRONG PAIR! Should be C6341/C6246 and they'r on the +25V rail, which explains the 30V rating.
Mods; don't know if it's possible to amend the first post? Waning powers John Last edited by John_BS; 15th Aug 2022 at 10:29 am. |