Posts Tagged ‘MULLARD’

Orange Amplification Announces DIVO VT1000 Valve Tester

Thursday, January 31st, 2013

Orange Amplification has released the DIVO  VT1000 Valve Tester, an automatic valve tester that performs a host of diagnostics on both preamp and power amp tubes. The unit has one octal and two nine pin valve sockets to fit pe-amp and EL34 valves. Once inserted, the user presses the start button and the tests are run.

Vt1000 valve tester

VT1000 Details:

Tests run:

  • Heater filament test: Short circuit
  • Heater filament test: Open circuit
  • Heater filament test: Tolerance check
  • Heater cathode insulation: Leakage
  • Heater cathode insulation: Short Circuit
  • Tests for heater current abnormalities
  • Amplification factor
  • Voltage gain
  • Power gain
  • Screen grid test
  • Mutual conductance test
  • Dual test for double triodes
  • Emission
  • Inter electrode leakage
  • Inter electrode short circuit
  • Flash-over (arc detection, high voltage breakdown)
  • Gas ionisation test

Compatible Valves:

  • EL34/6CA7
  • EL34L
  • 6L6
  • 6V6/6v6GTA
  • KT66
  • KT77
  • KT88
  • 6550
  • 5881
  • EL84/6BQ5
  • ECC81/12AT7
  • ECC82/12AU7
  • ECC83/12AX7
  • ECC99
  • 12BH7

JJ Electronic Tubes / Valves

Monday, March 29th, 2010

All materials used in the JJ tube  manufacturing process must comply with the most stringent quality requirements. In tube manufacturing, the fundamental requisite for the best production results is to maintain as high mechanical precision for assembly as possible. JJ Electronic uses assembly precision of no more than ± 0.02 mm.

Before tubes are assembled, they are thoroughly cleaned using such methods as the ultrasonic bath, chemical cleaning or annealing in an inert gas atmosphere (hydrogen, nitrogen).

JJ EL34

JJ EL34

A thorough inspection is performed on every component of the tube internal system before assembly. Assembled systems are then sent to sealing in a glass envelope. During the sealing procedure, the temperature of the glass pass-through joints must be controlled and joints are gradually tempered to relieve the inherent thermal stress.

Next, the assembled glass envelopes are evacuated by mechanical and diffusion vacuum pumps. During this process, the cathode emission coating is activated. All internal parts are heated by a high frequency heater and any spurious dust particles are evacuated. Finally, the getter rings are activated, while they absorb any residual gas inside the glass envelope of the tube.

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Every tube is then electrically tested for all parameters which are the key to a flawless operation and a great sound. Specifically, these parameters include: leakage characteristics, internal vacuum level, cathode emission capability, filament voltage and current, anode current saturation level, microphony and others.

Every month, random samples are taken from the production line in order to perform a life time test of 5000 hours under nominal conditions or 1000 hours at maximum specified ratings.

Tube Types

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