Hello,
looking for advice to replace old Eureka Emerald-125 tube assembly with some more recent fabrication assembly.
I'm figuring out if the TOSHIBA E7239X / E7239FX / E7239GX assembly could be used in place of the old Eureka one.
Have someone retrofit a similar model...?
Machine is Bennet HFQ-300
Depends on which end the stator is on.
I would probably use the E7239X, it's a 140,000 HU tube just as the Emerald 125.
The E7239FX the Stator is on the opposite end of the tube housing.
Or you would call it a 270° housing. where the E7239X is a 90° housing.
Normally the cable ends would be facing away from the operator on the X the Anode would be on the right. The FX the Anode would be on the left.
Or you could use a Varian Rad-8.
I am a dealer for both Toshiba and Varian.
Regarding the HFQ-300 doesn't matter which tube you install, you could also use the E7242X you just have to reprogram the tube in the OC.
E7242 is a 200khu tube.
Just make sure what ever you use it's an R-Stator.
I was looking the Varian Rad-8 and lately the Toshiba but didn't realize about the stator placement. Standing in front of the HFQ, the stator is at left hand. HV cables go to the back of the assembly.
This Emerald-125 assembly, the tube rotor I think got stuck at bearings. I checked the crank-up 220VAC and the 50VAC run voltage, it are ok. Timing its ok. also checked the 30uF capacitor and its ok. Stator coils are not open as the PCB detects the loading current (and measures some resistance). The machine do PREP and takes acceptable X-ray image at low levels (hand, arm) but not for higher densities (i.e. spine), it get white image. but the tube spinning noise is not longer heard. I will not open to the stator windings as I know is oil filled and requires special work so prefer to replace the assembly.
So, the E7239X & the Varian Rad-8 could be a direct replacement, even for the HV cable receptacles...?
Sounds like the bearings at the rotor froze, it happens with this tube of this age.
The cable receptacles or candle stick receptacles are standard ends, all the same.
The E7239x and the Rad-8 would be direct replacements.
There is a significant cost difference between the two by almost $5,500, being the E7239 is the lesser of the two.
Do not make any exposures on a stationary anode, you'll end up killing the high voltage tanks.
You cannot service the internal workings of the tube, the insert is made of Pyrex and inside the pyrex under vacuum is the anode disk and the filament cup. There are no user serviceable parts inside the housing.
You cannot replace the insert.
You could also purchase a replacement tube from Ray-Pac but they will require your tube to be returned for housing credit.
When you replace the tube you must make sure the stator connections are properly connected, Phase to Phase, Main to Main and Common to Common. You also must make sure that you apply the proper amount of vapor proofing compound on the candle sticks.
We do sell the Varian Silicon Oil and Washers to be used in place of the vapor proofing compound. Much easier to use.
Also you will need either a non invasive or invasive kV measuring device and a mAs meter to monitor the primary current in the hv tank per Bennetts instructions.
I'm not sure if I still have manuals on this generator.
If you want to purchase from us let me know, send me an email and I'll send you pricing from our corporate account.
Ron, ok sounds good, I appreciate the info.
The Varian Silicon oil and washers is something definitively will need. I will contact you about the tube & extras.
The clinic have been still triggering the machine since discovered it yet take images but I recommended to stop.
I have the manual for the Bennet, with instructions for verification/calibration. While I can measure the mAs, unfortunately do not have a kV measuring device of any type.
The most I could do is verify the mAs.
They must stop using the system.
Open the generator and pull the line fuses before they do more damage.
They cannot use the system with a dead tube no matter if it makes exposures or not.
Verify mAs only is okay if you don't have a kV measuring device like a Keithley. Another way to measure mA or mAs is with a scope and a 100ohm resistor in series with the mA loop and measure the voltage drop across the resistor.
Doing it this way you can see the exposure time and monitor the actual mA at the same time.
To do mAs verification requires an actual mAs meter in series with the mA loop. I use an old Fluke 8000A ma/mAs meter.
The Exposure time will always be constant thanks to the crystal oscillator in the circuit. Calibration on those generators is pretty straight forward.
I forgot to mention in case you've never changed a tube.
Any time you change a tube and pull any high voltage cable out of the tube or HV Tank. Turn off the generator, pull the cable end and ground the pins against the housing.
Mark the cable ends + & - depending on where they were inserted in the event some genius didn't dress the cables accordingly. Never ever mix cathod to anode or anode to cathode on one end, the tube and generator won't be happy.
It's not the same insert, it is a compatible insert 140,000 hu, 125kVp.
The housing is different as I explained in detail.
The X housing is different than the FX and the GX by horn angle.
The Toshiba tubes are junk compared to Varian, we're only able to get about 2 years out of them where Varian about 10-15 years.
Better bet would be to go to Ray-PAC and get a replacement tube.
I have done electronic level repairs on various PCB's for different machines (Bennet, orthophos, Pulsar, GE) but have never replaced tube (complete assembly to be more precise).
Was looking to buy some direct replacement, complete assembly to only reattach the HV cavbles, rotor cables, collimator etc. for the Bennet.
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Tech23
Eureka Emerald-125 replacement
June 16, 2025 05:49
Hello,
looking for advice to replace old Eureka Emerald-125 tube assembly with some more recent fabrication assembly.
I'm figuring out if the TOSHIBA E7239X / E7239FX / E7239GX assembly could be used in place of the old Eureka one.
Have someone retrofit a similar model...?
Machine is Bennet HFQ-300
to rate and post a comment
Ronald Swapp
re: Eureka Emerald-125 replacement
June 17, 2025 07:51
Depends on which end the stator is on.
I would probably use the E7239X, it's a 140,000 HU tube just as the Emerald 125.
The E7239FX the Stator is on the opposite end of the tube housing.
Or you would call it a 270° housing. where the E7239X is a 90° housing.
Normally the cable ends would be facing away from the operator on the X the Anode would be on the right. The FX the Anode would be on the left.
Or you could use a Varian Rad-8.
I am a dealer for both Toshiba and Varian.
Regarding the HFQ-300 doesn't matter which tube you install, you could also use the E7242X you just have to reprogram the tube in the OC.
E7242 is a 200khu tube.
Just make sure what ever you use it's an R-Stator.
to rate and post a comment
Tech23
re: re: Eureka Emerald-125 replacement
June 18, 2025 10:14
Hi Ron, thank you very much for the advice!
I was looking the Varian Rad-8 and lately the Toshiba but didn't realize about the stator placement. Standing in front of the HFQ, the stator is at left hand. HV cables go to the back of the assembly.
This Emerald-125 assembly, the tube rotor I think got stuck at bearings. I checked the crank-up 220VAC and the 50VAC run voltage, it are ok. Timing its ok. also checked the 30uF capacitor and its ok. Stator coils are not open as the PCB detects the loading current (and measures some resistance). The machine do PREP and takes acceptable X-ray image at low levels (hand, arm) but not for higher densities (i.e. spine), it get white image. but the tube spinning noise is not longer heard. I will not open to the stator windings as I know is oil filled and requires special work so prefer to replace the assembly.
So, the E7239X & the Varian Rad-8 could be a direct replacement, even for the HV cable receptacles...?
We are interested into fix this Bennet machine.
to rate and post a comment
Ronald Swapp
re: re: re: Eureka Emerald-125 replacement
June 18, 2025 11:33
Sounds like the bearings at the rotor froze, it happens with this tube of this age.
The cable receptacles or candle stick receptacles are standard ends, all the same.
The E7239x and the Rad-8 would be direct replacements.
There is a significant cost difference between the two by almost $5,500, being the E7239 is the lesser of the two.
Do not make any exposures on a stationary anode, you'll end up killing the high voltage tanks.
You cannot service the internal workings of the tube, the insert is made of Pyrex and inside the pyrex under vacuum is the anode disk and the filament cup. There are no user serviceable parts inside the housing.
You cannot replace the insert.
You could also purchase a replacement tube from Ray-Pac but they will require your tube to be returned for housing credit.
When you replace the tube you must make sure the stator connections are properly connected, Phase to Phase, Main to Main and Common to Common. You also must make sure that you apply the proper amount of vapor proofing compound on the candle sticks.
We do sell the Varian Silicon Oil and Washers to be used in place of the vapor proofing compound. Much easier to use.
Also you will need either a non invasive or invasive kV measuring device and a mAs meter to monitor the primary current in the hv tank per Bennetts instructions.
I'm not sure if I still have manuals on this generator.
If you want to purchase from us let me know, send me an email and I'll send you pricing from our corporate account.
to rate and post a comment
Tech23
re: re: re: re: Eureka Emerald-125 replacement
June 18, 2025 05:16
Ron, ok sounds good, I appreciate the info.
The Varian Silicon oil and washers is something definitively will need. I will contact you about the tube & extras.
The clinic have been still triggering the machine since discovered it yet take images but I recommended to stop.
I have the manual for the Bennet, with instructions for verification/calibration. While I can measure the mAs, unfortunately do not have a kV measuring device of any type.
The most I could do is verify the mAs.
to rate and post a comment
Ronald Swapp
re: re: re: re: re: Eureka Emerald-125 replacement
June 19, 2025 10:40
They must stop using the system.
Open the generator and pull the line fuses before they do more damage.
They cannot use the system with a dead tube no matter if it makes exposures or not.
Verify mAs only is okay if you don't have a kV measuring device like a Keithley. Another way to measure mA or mAs is with a scope and a 100ohm resistor in series with the mA loop and measure the voltage drop across the resistor.
Doing it this way you can see the exposure time and monitor the actual mA at the same time.
To do mAs verification requires an actual mAs meter in series with the mA loop. I use an old Fluke 8000A ma/mAs meter.
The Exposure time will always be constant thanks to the crystal oscillator in the circuit. Calibration on those generators is pretty straight forward.
to rate and post a comment
Ronald Swapp
re: re: re: re: re: Eureka Emerald-125 replacement
June 19, 2025 10:40
I forgot to mention in case you've never changed a tube.
Any time you change a tube and pull any high voltage cable out of the tube or HV Tank. Turn off the generator, pull the cable end and ground the pins against the housing.
Mark the cable ends + & - depending on where they were inserted in the event some genius didn't dress the cables accordingly. Never ever mix cathod to anode or anode to cathode on one end, the tube and generator won't be happy.
to rate and post a comment
Manuel Brugat
re: Eureka Emerald-125 replacement
June 23, 2025 11:03
Yes, It is completely safe to use the Toshiba's E7239X, E7239FX or 7239GX.
It is essentially the same insert.
to rate and post a comment
Ronald Swapp
re: re: Eureka Emerald-125 replacement
June 23, 2025 12:25
It's not the same insert, it is a compatible insert 140,000 hu, 125kVp.
The housing is different as I explained in detail.
The X housing is different than the FX and the GX by horn angle.
The Toshiba tubes are junk compared to Varian, we're only able to get about 2 years out of them where Varian about 10-15 years.
Better bet would be to go to Ray-PAC and get a replacement tube.
to rate and post a comment
Tech23
re: re: re: Eureka Emerald-125 replacement
June 23, 2025 01:12
Hello, thank you for your advice's and info.
I have done electronic level repairs on various PCB's for different machines (Bennet, orthophos, Pulsar, GE) but have never replaced tube (complete assembly to be more precise).
Was looking to buy some direct replacement, complete assembly to only reattach the HV cavbles, rotor cables, collimator etc. for the Bennet.
to rate and post a comment