Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
Selenium rectifier question
I have replaced two old Federal/ITT selenium rectifiers in an
amplifier power supply with new silicon diodes; the original part numbers are 103H4AX1 and 104B1AX1. I can't find any reference to either part on the web - anywhere - ITT can't even provide information. Since one of the legs of the circuit supplies the plate voltage (600V) I used 600V 10A diodes (NTE5815HC) to be safe. Problem is, there is a time-delay relay that closes to engage the 600V circuit, and without it attached to the amp; all tube supplies, biasing voltage, etc. are normal. If hooked up, once the relay closes - the main power fuse blows. I'm guessing I need a dropping resistor, but it would be nice to have the original data on the selenium parts to be able to figure out the value. The 600V and the -38V biasing voltage are derived from the same part of the power transformer. The -38 side works, but the 600V side reads upwards of 927 volts without a load. Using a Variac, the plate voltages were above 600V at about 70 percent. Is there a way to find the original specs on these selenium parts? Any leads would be greatly appreciated! |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Selenium rectifier testing ? | Electronics Repair | |||
Converting a six phase rectifier to three phase rectifier | Metalworking | |||
homebuilt welding rectifier: single diode instead of bridge rectifier? | Metalworking | |||
Selenium Rectifier replacement | Metalworking | |||
What is a rectifier fuse? | Electronics Repair |