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Douk Audio CT1
A premium tool for vacuum tube amplifier enthusiasts. With its dual meters, it ensures precise cathode current measurements for EL34, KT88, 6L6, and more. Safely test at low voltage, and enjoy universal compatibility with a range of tubes. Crafted from durable materials for a reliable, long-lasting tool. Get balanced, optimal performance every time.
Accurate Dual Measurement
Offers precise bias current readings for both 'A' and 'B' inputs, essential for maintaining balanced performance in your vacuum tube amplifiers.
Universal Compatibility
Compatible with a broad spectrum of power tubes including EL34, KT88, 6L6, 6V6, and others, making it an indispensable tool for various amplifier setups.
Safe Testing Protocol
Features a low-voltage testing method that protects both your amplifier and tubes from potential damage during the measurement process.
Durable Design
Built with high-quality materials like high conductivity copper, ceramic sockets, and gold pins for reliable and long-lasting performance.
How to use it?
- Power Down: Begin by turning off your amplifier to ensure safety.
- Connect the Tester: Attach the Nobsound tester to your amplifier.
- Remove and Replace Tubes: Carefully remove the power tubes from the amplifier and insert them into the bias probe sockets provided by the tester.
- Probe Placement: Insert the bias meter probes into the original tube sockets of the amplifier.
- Warm-Up Phase: Power on the amplifier and allow the tubes to warm up for approximately 5 minutes to reach operational temperature.
- Reading Bias Current: After the warm-up, take the bias current measurements using the dual current meters.
- Meter Readings: Note the readings on Current meter "A" for input "A" and Current meter "B" for input "B". Identical readings on both meters indicate perfect balance.
- Check for Balance: If the readings differ, aim for no more than a 2 or 3 milliamp discrepancy to maintain a good balance between the tubes.
George C.
Reviewed in Canada on February 16, 2024
There is a tolerance issue with the keyway hole in the tube socket that allows a tube to be installed incorrectly. This caused me to blow up an amp tube, blow the fuse in my amp and blow up one of the meters. I have ordered a new meter to replace the damaged one and I am going to fill the unused pin sockets with hot melt glue, so this cannot happen again. The product works fine otherwise.
Paul C
Reviewed in the United States on April 3, 2024
Worked well. I built a Guitar amp from a kit. The 66 Fender Deluxe Reverb. This device made tube bias of the 6V6 tubes a breeze.
WJF
Reviewed in the United States on January 18, 2023
I used this to adjust the bias on my Soldano SLO 30 and it worked great. I checked the accuracy with my multimeter before I trusted it the first time and it was right on. Cheap and easy to use, now I can check the bias on my 3 tube amps! The only thing like someone else mentioned was it doesn’t have any kind of box or cover on the back side area of the meters, but works fine how it is.
Customer
Reviewed in the United States on September 20, 2022
The device does not work. The right meter is stuck at 10ma when not in use and even if you try turning the adjustment screw it wont go down to zero. When I turn on the amp the left one reads 60mA and the right one reads 45mA, and when I swap the cables the right one still pegs at 60mA and the left at 45mA
Marc 805
Reviewed in the United States on September 24, 2021
First one worked for a few days. Went to check bias a few days later and the cathode resistor on one of my EL34's burned to a crisp as soon as I turned it on. I returned for a replacement and the same thing happened on the first use. Resistor went up in a bright flash and a cloud of smoke. Not worth taking a chance with this item.
Tray H.
Reviewed in the United States on February 11, 2021
The 2nd Time I used it, the key way on one of the two probes broke off.
Customer
Reviewed in the United States on December 30, 2021
Used it to check a Fender 5e3 pair of 6v6 bias current. Measured exactly the same as my digital multimeter.Only thing I would love or need to do is to acomodate it inside a project box for better handling protection.
richard r mabry
Reviewed in the United States on January 13, 2021
After struggling with a multimeter I finally ordered this and can’t be happier. No more fiddling with leads, the analog meters clearly show you what the current value is and where you want to go! So much easier to dial in the bias. So nice to see both tubes on this model in order to balance the circuit, can’t say enough how much this helped.
MI1800es
Reviewed in the United States on November 24, 2020
I've had a pair of wired octal sockets for years for setting tube bias. They went missing in a recent move, and I got this meter setup to replace them. WOW! The next thing I knew, a customer came in with a Blackstar switchable 4/40 watt amp that had gone haywire and smoked the output tubes. I soon found that any service docs for these amps are closely guarded at the Blackstar compound.... So we started troubleshooting & circuit tracing to see what had gone wrong. The amps use a FET to switch the B+ voltage to the output tubes from about 225VDC to full ~450VDC. The crazy thing about this circuit is that the amp has higher cathode current on the low power setting! The screen voltage is also changed, producing the same output tone at 4W as it has on 40W. It was a crazy intermittent problem, that finally was traced to the switching FET. It was rated at it's limits (like everything is these days!) it got replaced with one rated for 950V. It was quite a learning experience fixing this piece of equipment, and I believe that this meter really helped.
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