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[jolan]

je to celestion , typ neviem presne ktory,minule som mal rozobraty (daco tam bolo ROLA ? sa mi zda) je to asi uz stare, ale zatial sluzi viem len ze ma 16 Ohmov a okolo 75 (abo 100??) Watt.... pri rozumnej hlasitosti si nemusim vybrat nic :cool:

[rastis]

Originally posted by martinLM ...Tak ale vyzera to, ze oba stavy su pripustne, ale nie je to ziadna slava a netreba to prehanat s volume...

S tymto nemozem zasadne suhlasit. Aj ja som cital v niektorych manualoch americkych strojov, ze nizsia impedancia by nemala byt na zavadu, pretoze maju vystupy na to prisposobene, ale teoria hovori, ze nezatazeny / menej zatazeny koncak = zhorene vystupne trafo, takze kym mi to niekto nevysvetli odborne na urovni a tak, aby som to ako laik aj pochopil, tvrdim: Nizsia imedancia nikdy, vyssia kludne, bezohladu na to, ake mam volume. Potvrdzuje mi to vlastna prax, lebo uz sa opakujem, ale roky som hral so 16ohmovou bednou z 8ohmoveho vystupu, moja 16ohmova bedna zazila viac podii, ako ja, nikde nikto nemal ziadny problem, podobnu vec z praxe tvrdi Karpatak. A historiek, o zhorenych nezatazenych alebo zle zatazenych koncakoch som pocul tiez dost, pocul som aj o plamenoch. Keby som mal americky znackovy stroj, spolahol by som sa na ich manual, pretoze typci vedia, ako to vyrobili a ako sa to sprava, ale pokial je debata o historickych Teslach a spol, nizsiu impedanciu by som neriskoval.

[Martinlm]

www.talkbass.com/forum/showthread.php?t=175463&highlight=impedance+match+tube+amplifiers Tu je to podla mna odborne. [size=0]To understand WHY tube amps don't like higher impedances and why they are MUCH more dangerous to tube amps than lower ones, you have to understand what it is in both types of amps that actually does damage. In solid state amps, the output transistors are connected directly to the speaker load. Since solid state amps put out a constant voltage, the varible that determines power/current is the impedance of the load. Ohms law: P (power)= i (current)/r (resistance). The lower the load (resistance), the greater the amount of current is passed by the output transistors. Current also generates tremendous amounts of heat, which is why if the load is too low, the heat stress on a solid state's output transistors can damage them. The same rules apply to tube amps, but there is a deciding factor that makes a huge difference. Tubes are extremely high impedance devices, and in order to be connected to a speaker, must be coupled through an output transformer which takes the high voltage/low current output of the tubes and makes a high current/ low voltage output that can drive a speaker. Instead of being constant voltage amplifiers, they are constant current amplifiers. A transformer is an inductive coil that works by amplifying current and/or voltage. If the transfromer is not connected through a circuit on both its primary and secondary taps, it will feed back on itself and generate a large voltage spike at its connected end. What happens with too high a load connected to the transformer's secondary is that it acts like an open connection and causes feedback within the transformer. Since the primary of the transformer is connected to the plates of the output tubes, this voltage spike hits them first. As long as it doesn't exceed their limit, you're OK, but if it does, you can short them AND your output transformer. The reason a lower impedance is not so dangerous has to do with the nature of the tubes themselves. If the transformer secondary is connected to a lower than expected impedance, the transformer obeys Ohms law and tries to maintain a constant current, which causes a drop in the voltage of the plates of the tubes and they emit less, so power actually decreases. Some tube amps short themselves to ground when no load is present as a means to protect themslves from inductive feedback. That's as low an impedance as you can get![/size] Co samozrejme nevylucuje to, co popisujes!

[rastis]

Originally posted by rastis ...takze kym mi to niekto nevysvetli odborne na urovni...[/b]

...a po slovensky - ak mi to ma niekto iba prekladat, tak to si precitam aj ja o com sa tam zhruba pise ...

[Martinlm]

Tak sa do toho kludne pusti

[Majo Fero]

to Rastis: to co mas na fotke je G12H-100, ale ten co ja hovorim je G12H (bez cisla a ma aj iny zadny potisk). Je to aj ina seria: Classic loudspeaker. G12H-100 je seria General Profi-loudspeaker. Daj si www.celestion.com

[rastis]

dr.karpathorky - sak hej, ja som sa len divil, ze kde na tie znacenia chodia a co asi znamenaju tie pismenka ... :hm:

[Martinlm]

Lenze ten G12H-100 stal pod 2000 A tusim som ho niekde videl oznaceny aj ako Special Edition Celestion.

[Majo Fero]

Priklad G12-H100: Pismeno G - gitarovy Cislo 12 - 12"" membrana Pismeno H - Heavy magnet (velkost/hmotnost magnetu) Cislice wataz (nie vzdy ale suhlasi, ale plati cim vacsie cislo, tym vacsia wataz) Este viem, ze G12-M GreenBack. Je M pismeno Middle magnet. Toto su moje postrehy.

[Martinlm]

G12T-100? Thin magnet? Ja mam ten G12H-100, co Guitman a neviem o nom nic povedat. Nemal som ho moznost s nicim porovnat.

[Majo Fero]

Tie ciselne a pisomne znacky som cital kedysi na Celestion FAQ. Skuste sa tam pozriet, tam pisu aj o starsich modeloch. Myslim, ze ten G12T-100 sa uz nevyraba, neviem, treba to tam pozriet.

[rastis]

A G12 S znamena co ?

[MageZ]

G - guitar 12 - 12"" S - shit magnet?

[Martinlm]

Hej, to som chcel ja napisat, co je moj vtip!

[Majo Fero]

Pozrite si to na ich strankach. Nemozem vsetko vediet spamati. Tieto dve som si zapametal. Ked sa pozries na magnet Greenbackku a Vintage30 je tam pekny rozdiel. Preto som si zapamatal M-middle a H-heavy. Moze to byt aj vahove znacenie, nielen rozmerove.