|
Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
|
Thread Tools |
8th Jun 2022, 8:02 pm | #21 |
Nonode
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
|
Re: Tektronic 2465 failure
Further testing this afternoon reveals that there is nothing too awry on the regulator board. I can't make full tests because it needs both ±15V and ±5V to get the regulators working, and my supplies will only manage one or other....
__________________
Richard Index: recursive loop: see recursive loop |
11th Jun 2022, 11:48 pm | #22 |
Nonode
Join Date: Aug 2007
Location: Walsall Wood, Aldridge, Walsall, UK.
Posts: 2,853
|
Re: Tektronic 2465 failure
Hi!
If the current taken off the ±5 V and the ±15 V rails isn't too great you can use one or two of those cheap little "LM317/LM337 Adjustable PSU DIY Kits", available either in kit form if you like making things, or ready–built – you can use your bench supply to provide the ± 15 V then feed the "AC–0–AC" input terminals of the dual PSU module from the positive, centre–tap and negative terminals of your bench PSU and set the module to give ±5 V by means of the trimmers on it! If this isn't feasible because the common 0V points of the ±5 V and ±15 V connect to different potentials, two of these modules will meet your needs if you use two 15–0–15V transformers (cheap 5 W ones will do!), one per PSU module! If the above isn't clear I'll append a drawing when I've got time to do one! Chris Williams
__________________
It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed! |
12th Jun 2022, 7:18 am | #23 |
Nonode
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
|
Re: Tektronic 2465 failure
Even better news is that qservice.eu has the correct Tek part - 120.1244.00 - in stock for €5. I'd tried rewinding the coil but without taking the ferrite apart I couldn't thread the wire with enough density to get close to the required inductance (I got 8mH instead of 13mH). The two alternatives I tried were either too tall to didn't fit the PCB so I'm very happy to have the correct part on the way.
__________________
Richard Index: recursive loop: see recursive loop |