Not just a replacement, but an improvement! Please note, Emission Labs was the first company to introduce a mesh version the 5U4G in the year 2006. Also, we were the first company no re introduce the 5Z4 in 2007. This data sheet applies for the 5Z3-Mesh and 5U4G-Mesh, which are electrically identical, ripple factor formula for full wave rectifier from the sockets.
5Z3-Mesh uses an pour Pin UX4 socket. This is a direct replacement for the historical 5U4G or 5Z3, but it can not replace 5U4GA or 5U4GB which are different tubes. Note that the Emission Labs tube is somewhat larger size than the original old tubes. Check below at mechanical data, for details. Like most NOS rectifiers, also the EML rectifiers are Slow-Start tubes, protecting the power supply to some degree. The delay time for first function is 2 seconds, and the delay for full current is 7 seconds. For ultra low ripple, it is recommended to use the Lundahl LL1673 dual coil choke in low CMR configuration.
In this configuration, there is virtually no field radiation from the choke. Starting May 2011, we have included inside the tube glass a special element to stabilize the heater voltage. See also the pictures on the right. These elements at higher current, will increase their resistance, and help protect the heater against accidental over voltage.
Filaments are series connected, for best symmetry of the two diodes inside. Each tube is numbered, inside the bulb with a metal Tag. Two extra large getters, flashing the complete tube bottom. These tubes are shipped in a high quality box. Starting May 2011, we have started to ship 5U4G-mesh with the new ceramic socket, with five pins.
This is an octal socket, but has five pin holes only. It is specially used for this rectifier. When working with Octal sockets, you will find the Yamamoto an amazing top class product. For this rectifier you can take the special octal version with five holes only.
Total copper resistance of complete HV winding. These charts are graphical design tools, saving the trouble of calculations. Both charts show some degree of derating, meaning you can not have maximum current and maximum voltage at the same time. As the choke loaded circuit is not so hard on the tubes, you will see derating is less at very high current. So the maximum of 265mA can be used up to 350V DC output.
This is definitely not possible with a capacitor loaded circuit. From the right choke loaded chart it can be seen, the maximum current of 265 can be used to generate 350Volt DC, whereas the capacitor loaded circuit at 350V can only so 230mA. Yet when generating 480VDC, the limit is 150mA only of choke loaded, or 200mA capacitor loaded. It pays off to check, if you can fulfil the needs with a choke loaded circuit, and if yes, this would be the better circuit to take. You have to be in the white Zone.