Quick Answer: For a K40 or any 35-50W desktop CO2 laser, the Cloudray MYJG-40 (Model M40) at about $59 is the standard replacement power supply — the same unit Cloudray installs in its own machines. Stepping up to a 50-60W machine, the Cloudray MYJG-60W (about $125) is the right match, and for a RECI W2/W4 tube in the 90-100W class you need the Cloudray DY13 (about $155) — a different control interface than the standard MYJG line. A laser power supply is a wearing electrical component, not a permanent part, and it fails independently of the tube — don’t assume a dead beam means a dead tube until you’ve checked the PSU.
Every CO2 laser built around a glass or RECI-brand gas tube relies on a high-voltage power supply to convert wall current into the voltage the tube needs to fire — and like the tube itself, it wears out. Unlike a tube, a failing PSU often gives no warning: the beam simply stops, or a relay clicks with nothing happening. Below are the replacement power supplies we’d actually buy, split by machine wattage and tube type.
Best laser engraver power supplies at a glance
| Power supply | Best for | Wattage | Voltage | Price |
|---|---|---|---|---|
| Cloudray MYJG-40 (M40) | Best overall / K40 & 40W desktops | 35-50W | 110V/220V | ~$59 |
| Cloudray MYJG-60W | Best for 50-60W upgrades | 60W | 115V/230V | ~$125 |
| Cloudray DY13 | Best for RECI W2/W4 tubes | 90-100W | 115V/230V | ~$155 |
| Cloudray HY-T100 | Best with LCD current display | 100W | 110V/220V | ~$180 |
| Generic/OEM 40W PSU | Best budget | 35-40W | varies | ~$40-50 |
Laser power supply replacement by the numbers
- A basic Cloudray MYJG-40 replacement runs about $59, per Cloudray’s own product listing — a fraction of the cost of a full machine replacement or even a new tube, which makes it worth ruling out the PSU first when a K40-class machine stops firing.
- Stepping from a 40W to a 100W-class supply roughly triples the price (about $59 for the MYJG-40 vs. $155 for the DY13), reflecting the higher-voltage components a RECI tube in the 90-100W range needs.
- Most Cloudray MYJG and DY-series power supplies ship dual-voltage (110V/220V), per Cloudray’s own spec sheets, so the same unit works whether a machine is wired for standard US 110V or 220V shop service.
- The 100W LCD-display HY-T100 costs about $180, roughly triple the base MYJG-40 — the premium buys real-time current monitoring, which matters most on higher-power machines where overdriving the tube shortens its life fastest (see our best CO2 laser tube replacement guide for how current relates directly to tube lifespan).
1. Cloudray MYJG-40 (Model M40) — Best Overall
Cloudray MYJG-40 CO2 Laser Power Supply
- The same PSU spec Cloudray installs in its own K40-class machines, so compatibility with the most common desktop CO2 lasers is a known quantity.
- Dual-voltage 110V/220V input covers both standard US outlets and 220V shop wiring without buying a separate model.
- Straightforward two-wire high-voltage output and standard control-panel connector that drops into most stock K40 wiring without modification.
- No digital current display — you're relying on the tube's own behavior rather than a readout to judge whether it's dialed in correctly.
For most K40 and 35-50W desktop owners, this is the power supply to buy first — it’s the exact spec the machine likely shipped with, and it’s the cheapest way to rule the PSU in or out before spending more on a new tube. See our best K40 laser engraver guide for which machines share this PSU spec.
2. Cloudray MYJG-60W — Best for 50-60W Upgrades
Cloudray MYJG-60W CO2 Laser Power Supply
- Covers the 50-60W range that larger desktop and open-frame CO2 lasers (like an OMTech AF2028-60) use.
- Dual-voltage 115V/230V input, matching the same flexibility as the 40W model at a higher output class.
- Rated to drive a 50-70W tube without the strain a stretched 40W supply would put on it running past its comfortable range.
- More than double the price of the base MYJG-40 — only worth it if your tube is actually rated for 50W or above.
If your machine sits in the 50-60W class — the tier our best CO2 laser engraver roundup flags as the sweet spot for enclosed desktop machines — this is the supply built for it rather than a 40W unit pushed past its rated current.
3. Cloudray DY13 — Best for RECI W2/W4 Tubes
Cloudray DY13 100W CO2 Laser Power Supply
- Built specifically for RECI W2, W4, T2, and T4 tubes — the DY-series connector and current-sensing setup a standard MYJG supply doesn't use.
- Dual-voltage 115V/230V input, sold in both configurations depending on your machine's stock wiring.
- Correct pairing matters here more than in the MYJG line — a RECI-brand tube run on the wrong PSU family can misread current and shorten tube life.
- Costs roughly 2.5x the base MYJG-40, reflecting both the higher wattage class and the RECI-specific control electronics.
Running an engraving business? A free Amazon Business account unlocks quantity discounts and tax-exempt purchasing if you’re stocking spare electrical parts alongside consumables for a shop. If your machine runs a RECI W2 or W4 tube — the tube our best CO2 laser tube replacement guide flags as the max-service-life pick — this is the matching supply, not a generic MYJG unit sized for the same wattage.
4. Cloudray HY-T100 — Best with LCD Current Display
Cloudray HY-T100 CO2 Laser Power Supply
- Built-in LCD display shows real-time output current, so you can dial power to the tube's rated maximum instead of guessing from cut quality alone.
- Dual-voltage 110V/220V input, same flexibility as the lower-tier MYJG models.
- The current readout makes it easier to catch a supply that's overdriving a tube before it shortens the tube's life — directly useful alongside a fresh tube replacement.
- Priciest option here at roughly 3x the base MYJG-40 — the display is a real convenience but not essential if you already run steady, known-good settings.
For a shop running a machine daily — the same use case our best laser engraver for small business guide covers — the current display pays for itself by catching an overdriven tube before it fails early, rather than finding out only after a second tube replacement.
5. Generic/OEM 40W Power Supply — Best Budget
Generic/OEM 40W CO2 Laser Power Supply
- The cheapest way back to a working machine on a stock K40 or similar 35-40W unit.
- Functionally similar hardware to the Cloudray MYJG-40, but without a matching-parts guarantee if it arrives DOA or miscalibrated.
- Voltage support and connector layout vary more by seller — confirm both against your machine's stock wiring before ordering.
- Worth the risk mainly on a hobby machine that runs occasionally, where a shorter expected lifespan matters less.
For a hobby machine that only runs occasionally, this is a reasonable way to get back to firing without spending Cloudray-brand money — the trade-off is more variance in fit and quality control, both of which matter less if the machine sits idle most weeks.
How we chose
- Match wattage and tube type first, not just brand. A standard MYJG supply and a RECI-specific DY13 aren’t interchangeable even at similar wattage — confirm your tube brand before ordering.
- Don’t assume the tube is dead until you’ve ruled out the PSU. A no-fire machine or a clicking relay with no beam points at the power supply as often as the tube — swap this cheaper, easier-to-diagnose part first.
- Consider a display model if you’re tuning current regularly. The extra cost of an LCD unit like the HY-T100 pays off fastest on machines that get heavy daily use, where overdriving shortens tube life the most.
The bottom line
The Cloudray MYJG-40 (about $59) is the power supply to buy first for any K40 or 35-50W desktop CO2 laser — it’s the exact spec Cloudray installs in its own machines and the cheapest way to test whether the PSU or the tube actually failed. Running a 50-60W machine, step up to the Cloudray MYJG-60W (about $125); running a RECI W2/W4 tube, get the Cloudray DY13 (about $155) instead of a standard MYJG unit. For daily shop use where dialing in current matters, the Cloudray HY-T100 ($180) adds a real-time display, and a generic 40W supply ($40-50) is a reasonable stopgap on an occasional-use hobby machine. Whichever you buy, match it to your existing tube brand and wattage exactly — see our best CO2 laser tube replacement guide for pairing a new tube with the right supply, and our best K40 laser engraver guide for which machines share which PSU spec.