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bobkatz replied to the thread The Stax Thread III.Hi, John. Yep, I was the bloke! Nice to see you here, too. Roger, those output transistors are very impressive in the Carbon. I was... -
bobkatz replied to the thread The Stax Thread III.Hooray! I found some NOS SR-5 earpads in a sealed bag in my closet with Stax parts. I just put them on and the phones feel comfortable...
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bobkatz replied to the thread The Stax Thread III.No way, you remembered me! Sorry I forgot it was you. The Mjolnir Carbon amp is definitely shall we say "warm" but i think in a nice...
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bobkatz replied to the thread The Stax Thread III.The older you go in the Circumaural Stax, the brighter they were. Stax have always preferred "thin and bright" tonality, which is not at...
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bobkatz replied to the thread The Stax Thread III.I am absolutely not a fan of the Lambda-style Stax headphones, I was always uncomfortable with the imaging and even the tonal response...
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bobkatz replied to the thread The Stax Thread III.Not sure I understand your equating bias and drive voltage. I'm always using pro bias, that's a given at this point in the Stax world...
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those 10khz square waves still look pretty decent. a purpose built transformer with bifilar primary and secondary would result in a...
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bobkatz replied to the thread The Stax Thread III.Yeah, as I mentioned, I am using a 2 ohm 100 watt series resistor engaged with the primary of the step up transformer. I'm sure that...
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bobkatz replied to the thread The Stax Thread III.Notes on construction: I fiddled with gas discharge tubes for overvoltage protection and quickly rejected them. When they start to glow...
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bobkatz replied to the thread The Stax Thread III.Oh, Noise. Noise flat 20-20 kHz is 19.81 dB SPL, or 80 dB below 100 Volts. Crosstalk is not fantastic as you will see, but not terrible...
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bobkatz replied to the thread The Stax Thread III.That was fast, Aokman! All measurements made with 100 pF across the output, that feeding into a very high impedance U pad to take it...
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bobkatz replied to the thread The Stax Thread III.Moving to a much safer frequency, 50 Hz, performance is instantly much better, and considering there aren't many 20 Hz fundamentals in...
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bobkatz replied to the thread The Stax Thread III.Next, THD (without noise) at 20 Hz. This is really pushing this old transformer. The max SPL I can get at 20 Hz below 1% THD is at 108...
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bobkatz replied to the thread The Stax Thread III.Next, THD (without noise) at 1 kHz. First a reference THD at 1 kHz at 100 dB SPL. Note that I use 100 V RMS reference = nominal 100 dB...
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bobkatz replied to the thread The Stax Thread III.Next, freq response. For this measurement I use relative dB with an uncalibrated reference but the voltage is nominally 100 V RMS. Some...
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