What is a tube in the HiFi area?
It is an important component that determines the sound.
Where are the tubes used?
For high-end systems in the hi-fi area, and also for instrument amplifiers and other electronic devices.
How do I recognize defective tubes?
Brown spots, a milky precipitate (loss of vacuum) or no longer glowing tubes are immediately visible. More difficult to determine are "slowly dying tubes", in which the listening experience slowly changes. With aging preamp tubes, microphones, hissing and scratching noises creep in.
What does NOS mean?
NOS means New Old Stock. These are new goods as old stocks.
Which tube fits my device?
The easiest option would be to look it up in the user manual or online with the type number. If these cannot be found, only a look at the defective tube will help. The type, manufacturer and tube socket can often be read off here.
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What is a curve?
The curve of the tube relates the negative grid bias to the anode current.
After how many hours of playing time do the tubes develop their actual sound?
Full sound quality can be expected after about 15 minutes.
How long do the tubes survive?
The service life can be up to 10,000 hours.
How do the tube price differences come about?
The price is often determined by the high demand. For example, the Telefunken tubes, which are also of high quality. So-called NOS goods (New Old Stock) are old stocks of unused tubes, which are often of high collector's value.
What are comparison types?
A comparable tube, for example made in Russia, can be viewed here using lists.
Which tube testing devices are there?
There are different devices in this area. We ourselves work with Mr. Weigl's RoeTest V10.
Which tube testing devices are there?
There are different devices in this area. We ourselves work with Mr. Weigl's RoeTest V10.
What are postal tubes?
The postal tubes (or wide area tubes, or technical tubes) were special tubes that were used exclusively in postal systems and in professional measuring devices and amplifiers.
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Which of these manufacturers build tube amplifiers?Maihak ? Eckmiller ? EMT ? Neumann ? Braun ? Western Electric ?Audio Hungary ? Tad ? Copland ? Dynavox ? Nobsound ?Grundig NF10 und NF20 ?
Only Grundig NF10 and NF20 build tube amplifiers.