Dusky D2O Посібник користувача - Сторінка 6

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Power Tube Rolling

The output tube sockets of the D₂O Amplifier are wired in such a way that they

are compatible with both 6L6GC and EL34 power tubes, as well as many similar

tube types with compatible pin outs. Thanks to cathode biasing, there is no need

to rebias the power amp when swapping tubes.

Different tube types do sound different from one another, and a little

experimentation can open up some new and different possibilities. The extent to

which this might be worth it to you depends somewhat upon how you use the

amp. If you tend to play clean, differences between different tube types will tend

to be subtle. The harder you push the output tubes the more the differences

among tube types becomes apparent—with different tube types having distinctly

different breakup characteristics.

Some tubes that are known to work include: 6L6GC, EL34, E34L, KT66, KT88,

KT120, 6550, and 7581.

Avoid 6L6GB or 6L6GA, as these are not rated for the power or voltage

seen in the D₂O circuit and may fail catastrophically in the worst case and

just not last as long in the best case. There are no current production tubes

of this type, so you would only encounter these among vintage tubes. Our advice

is to save your vintage and new old stock tubes for circuits that are specified to

use those tubes.

7591s are not pin compatible, nor would they work in this circuit unmodified even

if they were. 6 V6s cannot handle the conditions found in the D₂O and

should never be used.

Routine Maintenance

The D₂O Amplifier doesn't really require much in the way of routine maintenance

and should be able to be used for years at a time without doing anything.

The following are things you are likely to encounter:

Replacing Tubes

The most common maintenance task is replacement of the vacuum tubes, as

these do wear out or intermittently fail. To replace the tubes, power off the

amplifier and let the amplifier sit long enough for the tubes to cool off enough to

be handled. P ower tubes get quite hot in the course of normal operation

and can cause serious burns if handled while hot. O nce the tubes have

cooled, remove the amp's lid by removing the four screws that hold the lid onto