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Metal box with dual analog meters and two octal probe sockets on top, gold-plated pins visible

LORDWORLD

LORDWORLD CT1-BOX bias probe tester streaming audio

SKU CH-ENV4-H050C MPN CT1-BOX

Dual bias current probes measure EL34, KT88 and 6L6 tubes with 100 mA meters in a shielded metal case

  • Dual bias measurement for EL34, KT88, 6L6, 6V6, 6550 tubes
  • 100mA range meters give precise cathode current readings
  • Ceramic sockets with gold-plated pins ensure durable connections
  • Metal case shields against interference for stable measurements
  • Copper wiring provides superior conductivity for reliable performance

Dual Bias Probe Tester for Tube Amplifiers

The LORDWORLD CT1-BOX is a dual bias current probe tester built for vacuum tube amplifier owners. It measures cathode current on two channels simultaneously using 100mA panel meters. The unit accepts EL34, KT88, 6L6, 6V6 and 6550 power tubes through ceramic sockets with gold-plated pins housed in a shielded metal case.

For Hands-On Bias Adjustment.

This tester suits hobbyists and technicians who manually bias push-pull amplifiers and want to verify balance within a 2-3mA window. It is not for users who need continuous data logging, software integration or automatic bias servo control. Builders working exclusively with octal tubes outside the listed types or solid-state designs should look elsewhere.

Verify Tube Sockets and DC Power Before Use

Confirm your amplifier uses standard octal sockets compatible with the supplied CT1-C probes. Ensure a 5.5/2.2 mm DC power source is available for the meter illumination. Allow five minutes warm-up after powering the amp before taking readings, and always switch the amplifier off before inserting or removing probes.

Highlights

  • Dual bias measurement for EL34, KT88, 6L6, 6V6, 6550 tubes
  • 100mA range meters give precise cathode current readings
  • Ceramic sockets with gold-plated pins ensure durable connections
  • Metal case shields against interference for stable measurements
  • Copper wiring provides superior conductivity for reliable performance

Specifications

BrandLORDWORLD

Questions about this item

Which power-tube sockets must my amplifier already have for the CT1-BOX probes to fit?

The probes accept EL34, KT88, 6L6, 6V6 and 6550 bases, so your amp needs matching octal sockets for those tube types.

Will the 100 mA meter range still read accurately if I keep older tubes that draw less current?

Yes, the dual 100 mA meters display cathode current for each channel, letting you verify balance within the 2-3 mA window even with lower-draw vintage tubes.

How do I confirm the CT1-BOX is giving correct bias readings after I power up the amp?

After a five-minute warm-up, check that both left and right meters show steady cathode-current values and that the two channels differ by no more than 2-3 mA.

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