Posts Tagged ‘NAMM 2011’

Tube Amp Testing For Professional Stage Performers – Engineering Tube Talk

Tuesday, February 22nd, 2011

A common requirement for tube amplifiers used for professional and stage purposes is that there should be a high percentage of confidence that one or more tubes will not fail during the performance. Tubes are often thought of in the same manner as light bulbs, in that they are most likely to fail catastrophically at switch on. This means that the moments just after the switch on point constitute the most stressful and potentially damaging periods in the life of the equipment.

In an attempt to guard against this possibility, it is common practice to do one of two things on a regular basis.

1/ regularly remove the tubes and have them commercially tested;

2/ replace the tubes with new stock on a regular basis.

These two methods may give the operator a degree of confidence but in fact, it can be shown that the faith placed in both methods is misplaced.

It is a known fact that removal of a tube from its socket results in a number of potentially damaging mechanical stresses on the metal to glass seals around the pins. Each insertion of an all glass tube will cause micro-cracking of the glass around the pin. This will invariably cause a small leakage of air into the valve, causing ‘gassing’ and eventually leading to its demise.

Removal for testing will also break the intimate contact between the holder and the tube contact pin, resulting in a poorer contact on re-insertion.

Many tube testers apply unreasonable electrical stresses to the tube internal electrodes and it is not uncommon for a known good valve to be damaged during the test. Tube testers can also give erroneous results depending on the way they perform the tests, possibly allowing faulty tubes to show ‘good’ and the good valves to be rejected as ‘bad’.

The second method of ‘blanket replacement’ with new stock on a regular basis can also lead to problems because if the failure distribution curve for tubes is analysed, it can be seen to follow the classic ‘bathtub’ failure curve. This inevitably means that an amplifier which is regularly ‘re-tubes’ will inevitably be considerably more likely to fail during the first hundred hours service than one which has been left untouched.

TubeSync overcomes these problems by performing an ‘in circuit’ test on the tubes every time the amplifier is powered up. The mutual conductance (gm) of the tube is measured by monitoring the cathode current of each valve whilst adjusting the grid bias in fixed steps. The results are tabulated and the new value is compared with previously stored values. A decision is then made on how far the tube has decayed in emission since the last test. Outputs from the device inform the user of the predicted remaining life of the tube.

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Orange Amps Launch TubeSync DIVO at NAMM 2011

Wednesday, January 19th, 2011

Orange Amps Launch TubeSync DIVO at NAMM 2011

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Orange Amps Launch TubeSync DIVO at NAMM 2011

Thursday, January 6th, 2011

For over forty years Orange amps has pushed back the boundaries of guitar amp technology and at NAMM 2011 the company is proud to announce a worldwide exclusive distribution agreement for DIVO TubeSync, a truly revolutionary new guitar amp technology. Here’s how Orange describes the technology:

TubeSync DIVO

The new DIVO technology automatically adjusts the bias of the output power tubes to ensure their full potential is realized. It monitors the amp’s performance and will isolate faulty tube failures, by running them at half power until the tubes can be changed. The DIVO system also increases the reliability of amplifiers by maintaining the optimum performance of the tubes by performing an ‘in circuit’ test every time the amplifier is powered up.

TubeSync-logo-500TubeSync DIVO technology opens up a whole new dimensions in tone options allowing for the first time ever the ability to mix and match tubes. You can experiment with an EL34, 6L6, 6550, KT77 or any other tube type all at the same time in the same amp. With DIVO the Tubes are automatically matched.

DIVO will extend the lifespan of your tubes and never again pay a tech to re-bias

Orange Logo Illustrator v9 BLKOrange amps will be offering this as option in their new Rockerverb 100 which will be “DIVO Ready.” For other Orange amps and most other brands Orange offer the DIVO Orange TubeSync OV4, a complete standalone unit.