Product Description

• Brand Model : Amptata T4
• Global voltage standard ( 100V~240V )
• Octal 8pin probes cable lengh: 55cm
• T4 tester can measures the cathode current of the power tube for bias reading (at low voltage side of the tubes)
• T4 can test many types. At present, we have 8pin and 9pin probes options
• This listing T4 suitable for 7591 7591A etc.
• T4 can get the reading direct from the pointer-type current meter. It does not need any convert from mV to mA

What's in package?

• 1pcs T4 Tester Body
• 2pcs Octal 8pin Bias Current Probes

Note:

• Keep the amplifier silent during use T4
• Turn off speaker sound,Do not turn on sound play songs
• Insertamplifier just is let the tube get power and warm up
• Read most accurate's tube cathode current in working state

How to use it? 

• 01: Turn off amplifier.
• 02: Remove the tubes then plug in T4 tester probes socket
• 03: Then plug T4 tester probes in amplifier socket
• 04: Turn off speaker sound turn on amp (Keep amp silent) and let tubes get warm about 5 minutes.Just turn on the amplifier without let speaker sing
• 05: Read the bias measurement
• 06: Two pointer-type current meters will show up two tube's reading
• 07: If tube reading is same.That's perfect. If reading is different. Should be no more than 2 or 3 mA difference for a good balance between the tube