Amp Supply Lk500zb Linear For Parts Not Working As Is Read On No Tubes
Reat physical condition inside out- for repair LK500ZB model heavy duty amp QSK option included. I bought this amplifier to fix came with no tubes, uses 2 x 350Z. It is wired for 220V. I replaced a couple burnt resistors. One was the grid shunt 1 ohm resistor the other for the +B meter. Meters are good because of the back to back diodes. I slowly ramped up the 180V where it sat for 30 minutes. Then ramped it up to 240V. Measured the plate voltage (after the choke, no tubes) measured +3,250V. Filament voltages right where they needed to be as well. Electrolytic caps look great (computer grade type) no bulging etc. I let it sit for a couple hours and then bang - a noise like a shorted cap. Blew up the variac's fuse.
Amp supply did not cut corners in their designs. Both (HV and filament) transformers are Peter Dahl. Fully tuned input relay controlled.10 meters option present but not installed, etc. Front of the unit is like new. Plate vernier slips a bit it should take you 5 minutes to adjust. This is a terrific unit to fix and put in service and as compact as you are going to get. Unit is over 50 pounds. WARNING: WORK ON HIGH VOLTAGE POWER SUPPLIES MUST BE PERFORMED BY A QUALIFIED LICENSED ELECTRICIAN. LETHAL VOLTAGES ARE PRESENT IN THE POWER SUPPLY EVEN AFTER THE AMPLIFIER HAS BEEN DISCONNECTED FROM THE MAINS.
THESE VOLTAGES ARE LETHAL AND MAY KILL YOU IF YOU DO NOT KNOW WHAT YOU ARE DOING. The item "AMP SUPPLY LK500ZB LINEAR FOR PARTS NOT WORKING AS IS READ ON NO TUBES" is in sale since Tuesday, April 17, 2018. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". The seller is "nisemboim1" and is located in Wilmington, Vermont.
- Frequency Band(s): HF
- Brand: Unbranded/Generic