The Hickok 539B is considered one of the finest mutual conductance tube testers ever made. I restored and upgraded this tester for accuracy and long-term reliability. A true workhorse for any serious tube collector or technician. This is a perfect tube tester for tube matching – Gm and plate current. It also comes with a one-year warranty for your peace of mind. See warranty details here.
Restoration:
- Solid-state rectifiers – replaced tube rectifiers for improved stability and reduced transformer loading
- New Roll Chart – 1970 edition for expanded tube coverage
- Capacitors replaced – capacitors prone to failure replaced
- Resistors Replaced – resistors affecting calibration and accuracy replaced
- New power cord – modern safety upgrade
- Calibration – calibrated to factory specifications and checked for accuracy across tube types
- New anode lead – for grid and plate tube connections connections
- Socket savers – added for protection of Octal and 9-pin sockets
- Bias circuit protection – Bias fuse lamp added to guard against Bias circuit damage
- Plate current mod – easily read plate current using external voltmeter; there is no need to use a milliamp meter
- Transformer balanced – optimized for consistent operation and accurate test results
Key Features:
- Tests transconductance (Gm), plate current, shorts, and leakage with laboratory accuracy
- Excellent choice for tube matching and evaluation
- Professionally restored and calibrated for dependable operation
- Electronics are in excellent condition – fully verified and reliable
- One-year warranty included
Condition:
There are NASA and “Government Property” stickers on the deck. I lightly cleaned and restored the case and it is in exceptional condition. There are a few scuffs as you’d expect on a tube tester of this age.
This restored and calibrated Hickok 539B is clean, calibrated, and ready for service.
The manual is available to download here
This is one of the cleanest cases I’ve seen.
This Hickok 539B tube tester is $1,600 plus shipping to the lower 48 states only because of the weight.
Contact Me if you are interested in this tube tester.
