Vs: Vs: Boosteri LTP:hen

#87270
Sancho
Jäsen

Jos englanti sujuu, niin voit tutustua asiaan vaikka tältä sivustolta lähtien:

http://www.freewebs.com/valvewizard/acltp.html

En edelleenkään ymmärrä miksi häntävastus ei pienentäisi putken yli vaikuttavaa jännitettä ja samalla ulostulosignaalia.

Suora lainaus valve wizardilta:

A larger tail resistor improves balance, although too large and it will limit maximum output signal swing and even lead to frequency doubling ('swirl'). Most guitar amps use less than 50k for the tail.

ja

Firstly, decide how much voltage you wish to allow across the triodes, and how much can be spared for the tail. The more we allow for the tail, the larger the tail resistor will be and the better the balance, but the lower the maximum output signal swing. The usual compromise is to allow about 25% to 30% HT across the tail. If your HT is fairly low (less than 200V) you may want to waste less on the tail (say 10%).

http://www.ampbooks.com/home/amplifier-calculators/long-tailed-pair/

Tuolla on tuommoinen gain laskenta ohjelma. Siellä sanottiin:

To get exactly the same gain in each phase (one positive and the other negative), the tail resistance needs to be infinitely large. (This can be demonstrated, for example, by setting RT to an unrealistically high value like 1M.) Having a large tail resistance limits the maximum output voltage swing, which is of particular concern for high-power amps.

Tarkoittaako nämä nyt sitä, että häntävastus ei vaikuta asteen vahvistukseen, mutta ns. 'headroomiin' kyllä?