peavey century 200

3 500:-

Ännu en förstärkare jag verkligen gillar men har alldeles för många, en klassisk peavey century 200 bass series som låter oerhört bra.

Den har renoverats och fått nya filter kondensatorer och andra elektrolyter osv utbytta. Potentiometerna har blivit rengjorda - dock har dess Master Gain lite glapp så hade behövts en ny potentiometer där. ( Dock endast ett problem när man ställer in volymen, när en position är ställd påverkas ljudet inget - så gammal potentiometer skrap, något jag personligen kunde leva med utan problem. )

Utöver vanlig service så har den fått högre värde på dess utgångs kondensatorer som orginal har relativt lågt värde för att få ut mer låga frekvenser ur den, ett tips som finns på nätet från en person som jobbade på Peavey som designer.

Hans resonemang kring det:

Forum postare: I got into a discussion of it with Bobby Baldwin (Peavey amp engineer) and he made some great suggestions about the output coupling capacitor that were easy to implement:

"Basically, capacitors pass higher frequencies with ease, but lower frequencies have a harder time passing through. This means that your power amp puts out a little less in the low frequency range than it does at 1K. The other thing that happens is that when you start to clip the power amp with low frequencies, instead of a pleasant growl, you get a nasty buzz sound. The way to fix that is to use a larger capacitor, but...

The other thing is that capacitors can be inductive, especially electrotytic caps, because the plates are rolled into a coil. This means that your power amp also puts out a little less in the upper audio range because the inductance starts to factor in a little. Inductors pass lower frequencies freely, but tend to block higher frequencies. Just using a larger capacitor can increase the inductance because the plates can be longer, thus more inductance.

Ultimately, the output response of your power amp is sort of a bell curve.

This capacitor is also subject to high ripple current (rapid charging and discharging) because there is pure, high AC current passing through it all the time. This can dramatically shorten the life of a capacitor.

The way to get around all of this is to use multiple capacitors in parallel, one of them being a film capacitor so there is no high frequency degradation. The inductance will go down because inductors in parallel divide. The ripple current will also divide so you won't be stressing a single cap."

I slutändan betyder det mer låga hZ, mer lows alltså.

Om en högtalare behövs har jag en 15" låda med eminence i ( rätt sliten låda ) så kan köpas med förstärkaren för några extra kr, typ 300kr.

Den finns i Karlshamn, förstärkaren kan gå att skicka.