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Grupos de noticias: sci.electronics.repair
De: "Martin Whybrow" <aholeinthegro...@ntlworld.com>
Fecha: Wed, 4 Nov 2009 20:16:07 -0000
Local: Mié 4 nov 2009 17:16
Asunto: Re: 12AX7, 7025, ECC83. ETC
news:3c177e12-0103-4c13-9001-9b151e157cd2@l2g2000yqd.googlegroups.com...
>I have a Fender reissue model guitar amp in for service. It has 2 I've had some complete junk Chinese tubes, e.g. power output pentodes that > Fender 12AX7's that are microphonic. These are Chinese manufacture. I > have replaced them with 5814's which is some sort of 12AU7 type just > to get the amp working. There is no more microphonic problem, however > the amplifier sensitivity is now somewhat lower so perhaps that may > have a bearing on this. I realise that I have no 12AX7's in the shop > at all and would like to buy several, two for this amplifier and two > or three for stock. I was looking at NOS and JAN types online and > would like to go with either but I suffered real sticker shock when I > noticed the prices. I don't have much faith in the Russian or Chinese > tubes so I was hoping that someone could offer some advice as to a > source for good preamp tubes either new or tested used, and ones that > I don't have to worry about microphonics. Thanks, Lenny. burned the cathode resistors on the first use due to internal shorts. I've had good luck with Russian tubes however, the Svetlana ones seem to be very good but you must make sure they're the St.Petersburg manufactured ones and not the Sovtek ones; see the bottom of this page for more information: http://www.amp-fix.com/biasing%5B1%5D.htm Martin -- martin<dot here>whybrow<at here>ntlworld<dot here>com Debes registrarte antes de enviar mensajes.
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