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Douk Audio CT1-BOX
Douk Audio's CT1-BOX is designed for tube amplifier enthusiasts. It offers dual bias current measurements for a range of power tubes like EL34, KT88, and 6L6. With ceramic sockets, gold-plated pins, and a 100mA current meter, it ensures durability and precise readings. Its sturdy metal case provides excellent shielding for accurate bias adjustments.
How to use it?
- Turn Off Amplifier: Safely power down your amp.
- Connect Probes: Link the testers to CT1-BOX's A and B interfaces.
- Insert Tubes: Remove and place power tubes into the probe sockets.
- Probe Amp Sockets: Position the bias probes into your amp's tube sockets.
- Warm Up Tubes: Power on and wait 5 minutes for tubes to heat.
- Take Readings: Check the left and right current meters for "A" and "B" inputs.
- Balance Check: Ensure readings are the same or within a 2-3mA difference for balance.
Versatile Compatibility
Designed for a wide range of power tubes including EL34, KT88, 6L6, and more, ensuring precise bias current measurement.
Optimized Performance
Copper wiring for superior conductivity and a metal case for enhanced shielding, ensuring reliable and interference-free measurements.
High-Precision Readings
Dual current meter reader with a 100mA range allows for accurate bias adjustments and easy readings.
Durable Construction
Features ceramic sockets with thick gold-plated pins for long-lasting use and reliable connections.
Mark D.
Reviewed in the United States on February 23, 2025
Be very careful when aligning with pins and sockets. You can very easily misalign and cause damage to meter and tubes. Slightly smaller alignment pin will allow you to not get correctly aligned with sockets and tubes. I blew up one meter and red-plated a tube.Cannot find a replacement meter since meter does not have full scale parameters on face.
Jmac
Reviewed in the United States on June 10, 2024
So easy to set up bias on mt 64 custom deluxe put the probe on first then tubes turn on amp and it reads both tubes. Took me about 5 mins after warm up to complete the bias.
Ken
Reviewed in the United States on June 1, 2024
My output tubes fit sloppy in the sockets causing the tube keyway to be offset and not align properly. This caused the tube pins to go in the wrong holes. I burnt up a very expensive amplifier with this cheaply made bias meter. I liked the idea of the two meters, and if they used quality parts, this would be a nice tool to use, but it's just to easy to insert the tubes in the wrong pins causing major damage to your amp.
Boston Bill
Reviewed in the United States on March 16, 2024
Functions as described. Have used it a couple of times on my vintage push pull amplifiers with very good results.
W. Bendler
Reviewed in the United States on February 1, 2024
I bought this to use in servicing tube amplifiers. It is very well constructed, with a nice metal case. The weight says quality right away. It's easy to use and the tube connectors are high quality. The cables could be twice as long to allow flexibility in placement of the meter, but as it is, I could just set it on top of a guitar amp cabinet while connected.
Kevmo
Reviewed in the United States on April 12, 2024
It worked well the one time I have used it. The tube socket included with the bias tester is stiff and difficult to get into the tube socket on the amp chassis. Even though I thought I was gentle, the pin orienting the bias tested plug broke off on removal from the chassis, I imagine the tester will still work but I will have to be careful with orienting the plug since there is no alignment pin. Picture above. My biggest complaint is that although Amazon and Douk say there is an 18 month warranty, it is impossible to submit a product complaint with Douk because their automated assistant sends you to Amazon woho tells you that it is not returnable and talk to Douk! I just want them to replace the plug. I would otherwise recommend this device with the comment that it seems flimsy for a premium price.
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