We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Copper probe body with ceramic eight-pin socket and 23cm cable

LORDWORLD

LORDWORLD Vacuum Tube Bias Probe Tester 8 Pin CT1-P Plate Current 23cm

SKU CH-PKY1-C6BTG

Measures plate current on EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120 and 7027 tubes via a 23 cm cable for direct milliamps readings

  • Tests EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 tubes
  • Insert probe, connect multimeter, read mA directly with no calculations
  • Copper body and ceramic socket with gold pins ensure reliable conductivity
  • 23 cm cable gives flexibility when positioning the probe in tight chassis
  • Fully assembled and ready for immediate bias testing out of the box

Vacuum Tube Bias Probe Tester

The LORDWORLD CT1-P probe measures plate current across a wide range of octal power tubes including EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, and 7027. It connects directly to a multimeter set to the milliamp range and delivers a direct reading without calculations. The fully assembled unit uses a copper body and ceramic socket with gold pins for reliable contact. A 23cm cable allows flexible positioning inside amplifier chassis.

Suits Technicians and Hobbyists

This tool suits amplifier technicians and hobbyists who need to set bias on the listed octal tubes quickly and accurately. It requires a multimeter with an mA range, so users without a suitable meter cannot obtain readings. Builders working with nine-pin, seven-pin, or other non-octal tube bases will need a different probe. The device provides no voltage measurement or automatic adjustment features.

Simple Installation Process

Installation is straightforward: remove the tube, insert the probe into the socket, plug the tube into the probe, and connect the multimeter leads to the probe terminals. The ceramic socket with gold pins ensures a secure fit, but forcing misaligned pins can damage the socket or tube base. The 23cm cable reduces strain, yet tight chassis layouts may still make insertion awkward. Always verify the multimeter is on the correct mA range before powering the amplifier.

Highlights

  • Tests EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 tubes
  • Insert probe, connect multimeter, read mA directly with no calculations
  • Copper body and ceramic socket with gold pins ensure reliable conductivity
  • 23 cm cable gives flexibility when positioning the probe in tight chassis
  • Fully assembled and ready for immediate bias testing out of the box

Specifications

BrandLORDWORLD

Questions about this item

Which multimeter do I need to read the bias current in milliamps directly from the 23 cm probe cable?

Any multimeter with a milliamp range will give a direct reading in mA when connected to the probe's output jacks, so no conversion or calculation is required.

Will the 8-pin ceramic socket with gold pins accept my existing EL34, 6L6 and KT88 power tubes without an adapter?

Yes, the socket is designed for EL34, 6L6, 6V6, 5881, 6550, KT66, KT88, KT100, KT120 and 7027 tubes, so those common octal types fit directly.

After connecting the probe and multimeter, how do I confirm the bias reading is stable and correct?

Set the multimeter to the mA range, power up the amplifier, and watch for a steady milliamp value that matches the tube manufacturer's recommended bias current for the specific type installed.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.