Radiometer Copenhagen OSG 42b Oscilloscope Repair, From The 1950’ish

The previous owner of this Danish vintage oscilloscope had tried to plug it in and the only result was smoke! I was asked if I wanted it for repair or it would be thrown out. The Radiometer Copenhagen OSG 42b …

Radiometer Copenhagen OSG 42b Oscilloscope Repair, From The 1950’ish Read More

Hitachi 890-2430 Deuterium UV Lamp Test and Theory

This is a short walk-through on deuterium UV lamp theory and a test of the lamp in operation from its rather special power supply. PSU failed. Lamp failed. Complete fail. The lamp comes from the teardown of a Hitachi L7450 …

Hitachi 890-2430 Deuterium UV Lamp Test and Theory Read More

Power Vacuum, Radio and Electron Tubes – Isolation, Day 7

A talk about various power vacuum, radio or electron tubes, depending on what you like to call them. Triodes, Tetrodes and Pentodes in a range from 10 to 800 Watt plate dissipation. PL36, EL34, 6P45S, PB2/200, PB2/250, QB3/300, 250TH, QB5/2000, …

Power Vacuum, Radio and Electron Tubes – Isolation, Day 7 Read More

Siemens Polyphos 30 X-RAY Head 125kV Teardown (Part 1 of 3)

Teardown of the Siemens Polyphos 30 X-ray head which contains step-up transformers, voltage multipliers and a rotating plate x-ray tube and a lot of oil! Be sure to check out part 2 about the collimator and image plate and part …

Siemens Polyphos 30 X-RAY Head 125kV Teardown (Part 1 of 3) Read More

100 Watt 6P45S amplifier update #2

The latest update to the 100 Watt 6P45S tube amplifier is about a lot of testing and fault finding that have gone into the tube amplifier. This is to correct noise and hum issues. It is now in a state where the …

100 Watt 6P45S amplifier update #2 Read More

100 Watt 6P45S Tube Amplifier Update

The latest update to the 100 Watt 6P45S tube amplifier is about the new printed circuit boards. The circuit boards was installed in the enclosure and a simple signal generator test was performed.

100 Watt 6P45S Tube Amplifier Update Read More