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    Ampex electronics for the best possible sound

    Studio machines, required maintenance.... Working on one of my Ampex transports today had me thinking about the true cost of ownership when it comes to the larger studio machines. There are occasional expenses that come up such as head work, which can be significant, although given the limited...
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    NEW Acuhorn amplifiers 6C33C tube output transformerless

    To put all this in context you have to go back and read the opening post: I had been anticipating some new circuit topology, although hard to believe we've yet to see anything that hasn't been done with tubes such as the 6C33C. So far the graphs don't support the claims. Comments...
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    NEW Acuhorn amplifiers 6C33C tube output transformerless

    If you look at the photos from the link in post #1, the 'pencil tube' is the tiny glass tube located on the board near the RCA jacks, lying horizontal. Best guess is that it is the driver for the 6C33C, but that's just my assumption. As mentioned they're often used as tube buffers in solid state...
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    NEW Acuhorn amplifiers 6C33C tube output transformerless

    Unlike other twin triodes in the same glass envelope, the 6C33C internal structures are connected in parallel, except for the filaments.
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    NEW Acuhorn amplifiers 6C33C tube output transformerless

    Which means a driver stage with substantial voltage swing, but I don't see that in such a small package. Could this simply be a class D amp with tube buffered output stage? Tom
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    NEW Acuhorn amplifiers 6C33C tube output transformerless

    Yes, you are correct. 6C33C is two triodes in one envelope, although the plates and cathodes exit in parallel. Tom
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    NEW Acuhorn amplifiers 6C33C tube output transformerless

    A better overview of the circuit topology would be interesting. 6C33C SE OTL, looks like SRPP. Those big Russian bottles are tough on sockets, from past projects I recall trying to stay well under 60~70% plate dissipation as even the NOS sockets would quickly degrade, along with increased...
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    REW with EMM6 and Mytek DSD/DAC

    Yes, I downloaded the file after purchasing the mic. Hooked it up tonight and managed to take a bunch of measurements, although I suspect none of that was done entirely correctly. Practice will improve...either that or I'll have to consult with one of the forum REW gurus. Playing with my sub...
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    REW with EMM6 and Mytek DSD/DAC

    Wayne- Yup, good catch. It is a UMM-6. Tom
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    REW with EMM6 and Mytek DSD/DAC

    The mastering version of the Mytek 192 omits line inputs in favor of SDIF DSD inputs, which negates the possibility of loopback; I hadn't thought that far. Difficulties setting up the new laptop prevented me from taking any measurements last night, but perhaps tonight we'll get a but further...
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    REW with EMM6 and Mytek DSD/DAC

    How does one set up REW when using an outboard USB mic (Dayton EMM6) and an outboard DAC (Mytek 192 DSD mastering version), in terms of the soundcard 'loopback' calibration? Normal practice is to connect soundcard output straight back into the input, but I can't find a discussion that expands on...
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    Quantegy 407 Tape

    Excellent. Was there any useful information (date, lot...) on those pancakes for reference?
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    Quantegy 407 Tape

    Yes, but you have to be careful. The temperature controls in most ovens aren't that precise and it's easy to heat the tape beyond what it will tolerate. Tapes in which the binder has become hygroscopic have done so in storage over considerable time. I've found on most reels that the problem...
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    Analog vs. digital music: What's better, and who cares?

    My response could be no better than what Mike and Christian already said, however I suspect for many of us the argument is pointless; we have the equipment (capability) to play recordings in whatever format that is most suited to a particular piece of music. Tom
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    Quantegy 407 Tape

    The SSS subject has been beat to death on various recording forums, but in a nutshell: Yes, much of the 407 exhibits sticky/shed, even pancakes which are found sealed or purported to be 'new'. If you are doing anything that could be considered important, purchase new ATR or RMGI tape and go...
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    What improvements have we seen in high end audio in the last 25 years?

    Rob, my experience in practice has been the opposite. Two pairs of ML reQuests with Krell FPB250m, 350 MCx, FPB600m, Theta Dreadnaught II and a few other less-mainstream SS amps, none were lacking in the low end but best total authority came from a pair of MA-1 MK II.2s.....still have them...
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    Ampex electronics for the best possible sound

    Thanks, Myles. Interesting machine. Tom
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    Ampex electronics for the best possible sound

    Nor I. OK, what is it? Tom
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    Ampex electronics for the best possible sound

    Ki- Conversion from native 1/2" (which I believe that machine is) to 1/4" is easier than the reverse scenario. You'll need the obvious mechanical parts...1/4" idler, tape-break arm, etc, but you won't have to swap out your 1/2" reel motors. The 1/2" motors can work fine with 1/4" tape if...
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    Desert island R2R 1/4" 2 track master player

    Leif, What did you clean the top covers with? Mine are a bit dull but I've not wanted to use anything besides mild detergent for fear of over-cleaning (making shiny spots). Tom
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    Desert island R2R 1/4" 2 track master player

    John at JRF added a 1/4" 4-tk Flux repro head to my A80 VU...little switch on top of the headblock selects 2-tk stereo or 4-tk playback. Really woke up some of those consumer 7" reels. Tom
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    Ceramic metal triodes

    I'm guessing a pair of those in class-A audio service would be overkill, assuming you could get past the 1000 watt filament supply (per tube) requirements and the 7~12kv plate supply. And the forced air blowers to cool it all. There was a fellow some years back who used a pair of Svetlana...
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    Why Tube Amps Sound Different (and better) Than SS Amps

    1400mA per tube? And you're only shooting for 125 watts/channel...... 750mA for each output stage bank gets most OTL's close to 125 watts. Tom
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    WTB: Ampex AG350 or AG300 electronics

    Looking for an Ampex AG350 or AG300 slave channel. Probably not a mainstream item on this forum, but there's enough tape enthusiasts or recording pros lurking here to make it worth the ask. Thanks- Tom B.
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    REW with Calibrated Dayton UMM-6 on Mac - What are the settings?

    Navigate to the Dayton UMM-6 page, enter the mic serial number and it emails the calibration file. http://www.daytonaudio.com/index.php/umm-6-usb-measurement-microphone.html
  26. T

    Studer A810 for sale in Canada

    Correction: In this case shipping from the seller was via UPS, and as the shipping destination (my office) also had a UPS account, the duties were charged to that account. Just FYI... Tom
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    Studer A810 for sale in Canada

    Not if you live in Canada, and we have several that do. Correct, but the taxes are substantial if you don't. My last purchase from CA was disappointing as the seller charged the duties to my UPS account without my permission. If the shipping destination is via shipping account, customs will...
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    Studer A810 for sale in Canada

    Then there's the import duties :(
  29. T

    Remodeling almost complete

    I guess MA3's are out of the question then......:)
  30. T

    New Krell Amps.

    I miss the FPB Mono series, such as the 350 MCs all the way up to the FPB750MCx's. Build quality was waaaaay over the top. Sigh......... Tom

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