Почитал седня маршалловский сайт и понял, что пора менять лампы в моем JMP-1.
Нашел в нете EH 12AX7 по хорошим ценам:
eh12ax7 EH 12AX7 / ECC83 6,20 EUR
eh12ax7-b EH 12AX7 / ECC83 Balanced 12,10 EUR
Они предлагают отобранные лампы, которые они называют Balanced, насколько я понял из описания, у них одинаковые параметры у обоих триодов в одной лампе.
Толком не понял, нужно ли мне это?
Я им отправил мыло и они мне написали:
"Hallo, in your case the normal tubes will do the shop."
Вот описание их отбора ламп:
Preamptubes
We offer some of the preamp tubes as “Selected Versions" for special purpose:
V1-Selection
These tubes are selected for use in the first gain stage of guitar amps. These tubes are tested for gain, mikrophonics and low noise and highly recommended for any "HiGain" amp.
Audio-Selection
These tubes are tested like the V1-tubes except that the noise of the tube must be much less than with the V1-Selection. These tubes are recommended for audio/highend-Applications and studio amps
Balanced Selection
So called “Blanced” tubes are selected for use in phasesplitters and driversections of a tubeamp.
In addition to the “Audio”-Selection these tubes are also tested for symmetry – this means that both triode systems of the tube do have the similar electrical properties; they are balanced.
These tubes are recommended also for use in headphone amps and studioequipment
Оригинал тут:
http://www.tube-town.de/info/doc/tt-matching-en.htmlhttp://www.tubetown.de/ttstore/index.php/cat/c7_Electro-Harmonix.html