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12ax7

  1. Sam08861

    12ax7 tube rolling Fisher 500b

    I'd restored the 500B some time ago. Jim McShane Kit with PIO K40Ys and Matched Tung Sol quad from him also + IBBA. Decided to order a set of the Sovtek 12AX7LPS and got here this afternoon. After taking out the 7 12AX7s in the chassis, I found they all measured ~56 on my Eico 625. The New...
    • Sam08861
    • Thread
    • 12ax7 500b fisher mullard telefunken the fisher tube rolling
    • Replies: 6
    • Forum: Fisher
  2. 8xlaxx

    Let's look at a Dynaco PAS-3x

    Seeking expertise for my PAS-3x with some symptoms it's having and where I should start in resolving issues. This pre is new to me and I have no knowledge on the back history. For the most part it looks stock, powers up and plays but there are a couple changes on it. In using the phono...
    • 8xlaxx
    • Thread
    • 12ax7 dynaco pas-3x telefunkens
    • Replies: 16
    • Forum: Tube Audio
  3. stanko

    The Telefunken 12AX7 that isn't. (It's a Siemens)

    Came across something interesting while digging out 6HB5's for my amplifiers. When I bought my SP3 in 1977, the guy gave me a box of Telefunken 12AX7's along with it. He had bought something like 10 dozen back in the day and gave me 4 dozen or so. These are all NOS. But if one looks closely...
  4. ScooterMcTav

    Tube Pre vs. Tube Power amp - my experience

    So as a relative newcomer to tubes, I was thrilled with the Jolida JD-302brc integrated I received in trade from another local enthusiast. Compared to every piece of SS gear I had ever owned, I could not believe the clarity of sound my system now delivered. Vocals had an immediacy I had never...
  5. davstev

    What 12ax7 tube brand is this?

    Hi all, I am no expert in tube identification, especially when the markings are partially rubbed off. See attached pics. These are clearly 12ax7's made in the USA, but can anyone else tell me, based on the white circular logo, what it might be? Any idea when it was made? There is no marking...
  6. thorpej

    NFB and first stage headroom

    I've been fretting over the first stage headroom in the 6L6GC UL amp I'm working on. Trying to balance quiescent voltage of the 12AX7 AF amp stage against the needs of the DC-coupled differential inverter and finding the most linear operating region of the 12AX7 has led me to setting the bias...
  7. goldswimmerb

    12AX7 Recommendations

    Hey guys, So I just got a Little Bear RIAA T10 V2.2 Pre-Amp and have been noticing a ton of sibilance with the Chinese tubes that it comes with. I was wondering if you guys could possibly recommend some decent 12AX7 tubes, preferably under $60 for 3 of them. Thanks!
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