Fusor Forums

I applied 24V to the fan connector and the digital circuitry came on with a green system power light. This narrows the problem down to the converter. C149 has about 120V across it, diode CR34 is good, and the transformer T2 appears intact. Both secondary coils do have continuity between them, but I ...

I replaced the blown IRFBG30 mosfet on my power supply board, but it still does not function. I checked all of the capacitors, and C149 has a slight bulge but has no continuity. Otherwise none of the components on the board appear damaged. Removing the fan revealed that there is only about 2V on the...

I have found the failure point in my power supply. A IRFBG30 mosfet blew out on the top board and came right off the board in pieces. I'll be ordering a replacement and will see what happens. I hope it didn't cause a chain of failures, or vise versa. Location of the blowout http://i1186.photobucket....

One of mine was also DOA, even though I can hear a humming noise emanating from somewhere. I checked both input fuses and they were fine, and power was going to the board, but nothing. The one that works came on immediately; the Ethernet connector blinked a few times, the fan came on, and the power ...

Since I have a small 2.75" 6-way chamber, running the grid white-hot for about an hour resulted in the disappearance in the rainbow pattern as the walls turned black. I have looked at the effects of this tungsten "bombardment" on aluminum foil under a SEM, and compared to regular foil, the damage is...

Sorry, I'll give a few more details. I contacted Ludlum a month ago and they were nice enough to donate a Model 3 with 44-9 probe and Model 26 handheld frisker. Everything is functional and calibrated. The neutron tube seller had a NIM bin setup and provided a video showing the tube's response using...

I recently acquired a Ludlum Model 3 and a large He-3 tube. The seller said the tube responded well at 1500V, which is the upper end of the Model 3's voltage range, so would the Model 3 work with such a tube? Technically it's not made for proportional tubes and the discrimination can't be adjusted, ...

The new TCP-040 controller arrived today, and I bolted the chamber together to do a vacuum test. The roughing pump only reached about 350mtorr due to outgassing, but the turbo pump pulled the chamber to 1E-5 torr in just a few minutes. The turbo accelerated fine and has a high, almost piercing pitch...

No, they're willing to inspect it for free to see if it's repairable, but one of the (technicians?) emailed me and said it's not.

I have contacted a repair company and they say that when the magnet rings are cracked, the pump is irreparable. Is this true? The pump rotor can be disassembled with a spanner wrench, and ultimately everything had to be assembled, including the magnet rings, so...?