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    Baking vacuum tubes

    One of my Acapella plasma tweeters became noisy about 3 weeks ago. There is a static noise that occurs at random, sometimes with showers of them that last for a few seconds, sometimes just periodic pops. The problem seems to be getting worse over time, and has become impossible to ignore...
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    Anyone with experience with transmission line subwoofers ?

    Does anyone have experience with transmission line subwoofers such as these: https://www.wisdomaudio.com/subwoofers-2/ I wonder if they might be a better match for horn speakers than a convention sealed or ported subwoofer ?
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    New R2R tapes of Jazz at the Pawnshop from AudioNautes

    I just received my tape copy of Jazz at the Pawnshop from AudioNautes last week. For those of you who are unfamiliar with this recording, which I suspect will be very few, I will outline its origin. This is a live recording made over two days in December 1976 at the Jazzpuben Stampen (meaning...
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    Stamper number on Decca LPs

    I read on line that the dead wax marking at the nine o'clock position of Decca LPs refers to the mother number coming from a particular lacquer, and the marking at the three o'clock position refers to the stamper number coming from that mother. On my copy of the Solti Beethoven ninth from 1972...
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    New source for master tape copies of EMI recordings

    Late last year, I read on a tape forum that an Italian audio magazine called Audiophile Sound, which had already released several LPs of early EMI recordings, has secured the right to release tape copies from the EMI catalogue. Even though the LPs were mastered from digital files, the tape...
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    A question on anti-aliasing filter

    With Redbook CD standard, the Nyquist limit is close to the audible frequencies and a steep anti-aliasing filter is required. I wonder how they approach this with high rez PCM ? Do they use a steep filter close to the Nyquist frequency, or use a gentler filter slope at a lower cutoff frequency...
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    Cantate Domino reel to reel tape

    I just received the Cantate Domino tapes today. I listened to them right away after work tonight. The packaging is the best I have seen. There is the full 2500 feet of tape in each reel, which is good and bad. This makes it easier to secure the tail of the tape, but it means more winding and...
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    Atma-Sphere MP-1 preamplifier as tape head preamp: anyone with experience ?

    I am currently using a DIY version of Allen Wright's RTP-3C preamp as tape head preamp for my Nagra TA. I built this more than 20 years ago as a phono preamp, and later modified it to serve as tapehead preamp. It is fully differential using constant current sinks, with a shunt regulated power...
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    Nagra T Audio problem. Anyone with experience ?

    I recently changed the belts of the reel holders of my Nagra T Audio. After reassembling the mechanisms, the machine fast forwards and rewinds smoothly. However, when I hit Play, it played for a few seconds and then stopped. Since then, the machine has refused to play. I measured the...

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