Products > Test Equipment
A new fan for a Tektronix 2465
amyk:
--- Quote from: Orpheus on November 14, 2013, 01:50:01 am ---But how could you not listen to advice from a VintageTekFan?
Talk about the horse's mouth!
--- End quote ---
:-DD
--- Quote ---The R/C motors are typically designed for maximal power/weight ratio, but this motor is all about just being quiet.
--- End quote ---
They can be quite loud at maximum speed but if you run them far below rated power they're usually rather quiet.
siggi:
So I installed that 60x60x20mm fan - it's a Sunon 5000RPM, 27.5cfm model, using the 2465B's fan control circuit. The circuit runs the fan at ~8V at 25C ambient, ramping to ~13V for 65C ambient. The good news is that there's ample space for the fan back there, there's no issue with ventilation or exhaust. The bad news is that even at the lowest speed, the fan is pretty loud.
One day when I've accrued sufficient hobby budget, I think I may have Matthew perform his restoration magic on my fan motor, or I may try and buy a replacement. There really is a world of difference between the noise level from the original fan (when not squeeking or rattling) to the fan I installed. At least now it's just a consistently annoying fan noise, and not an ever-changing rattling that'd sometimes find resonance in my workbench :/.
VintageTekFan:
When I originally got my 2465, the fan was melted into a solid blob - no idea how loud it was.
siggi:
I was lucky enough to score a brand-new fan motor on eBay for a very reasonable price. I was surprised to find it, but now my old scope is restored to it's former whisper-quiet fan performance.
Well worth the time and money, IMHO, there really is a world of difference in the noise level.
vikbez:
Hi
I just bought a 2465A with option 01 & 09 and to my surprise it has the old Siemens fan.
I'm here because the fan is noisy, but hours count on scope is only 453. Is this normal lifetime for this fan ? (and is this many for the scope ?)
Because of this I'm hesitating between buying a NOS fan or replacing it with a DC 12v standard one.
Siggi what value did you use for the NTC ? And did you use the 15v unregulated voltage for the old motor assembly ?
Thanks
Edit: I found the fan control schema for the 12vdc fan in the 2465B service manual so I will just copy it if needed.
But still I would like to know the expected lifetime of the original fan. Thanks
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