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I'll begin the measurements with the EL34'd 225s, and save any comparisons with the KT90 version for the KT90 measurements section.

The EL34'd 225's output impedance was just under an ohm across the band, measuring 0.97 ohms at 20Hz, 0.89 ohms at 1kHz, and 0.79 ohms at 20kHz. This is a moderate value for a tube amplifier, but high in relation to most solid-state amplifiers. For comparison, the VTL Compact 160 reviewed in August had a very high output impedance of about 1.5 ohms at 1kHz in triode mode and 2.2 ohms in pentode mode. The 225's high…

Looking next at the 225's behavior with the KT90 output tubes (a different amplifier sample), there were a few differences compared to the EL34 version. I'll note these differences when they are significant.

Output impedance with the KT90s was virtually identical, measuring 0.95 ohms at 20Hz and 1kHz, decreasing to 0.87 ohms at 20kHz. Input impedance, though still fairly high, was much lower than the EL34'd 225's input impedance of 129k ohms at 74.5k ohms. Input sensitivity was 1.63V, about half a volt more being required than the EL34 version to be driven to clipping. Since the…

If anyone is still around who hasn't been reading their back issues of Stereophile religiously, the California Audio CD player ($1895) uses tubes—without overall negative feedback—for all of the analog circuitry. It uses triode class-A tube stages, operating in dual mono, for current-to-voltage conversion rather than IC op-amps. It also uses passive filtering for output-waveform reconstruction within the tube analog section, instead of the active low-pass networks used in other players, and uses passive de-…

With the Cambridge Audio CD-1 ($2500), one never knows if one is hearing the final version of this elite and nearly total rebuild of the Philips Model 104, or even if there ever will be a final version of this player. I should point out, however, that Cambridge is now being imported by Sumiko—one of the best and most demanding importers—and hopefully will now be both consistently reliable and available in the form of a stable and finished product.

The two units I have heard so far avoid the treble edge and…

After prolonged listening, I've concluded that there is simply too much bass on the MCD Pro. This is a problem that's not immediately evident, and will affect you differently depending on your system. For systems with true low-bass response, such as the RS-1Bs or Quads with Janis subwoofers, there will be a definite problem. Not only that, the quality of that bass is somewhat loose, though not nearly as uncontrolled as the bass on the original Meridian MCD. In spite of its other virtues, I must modify my…

The new 16-bit-with-oversampling version of the $999 Mission CD player is more dynamic, with better bass, and a deeper, more open soundstage. Nevertheless, in my opinion the better modifications of the machines using the original Philips 14-bit process are still better-sounding in virtually every respect, the Mission having a touch of the 16-bit sound problems encountered in the Philips CD-650.—Anthony H. Cordesman

My own sympathies…

That's the thing about listening to music on the radio: Someone thought of it for us. It's exciting when someone else plays music that you know and enjoy. It's like when your father says he's going to take you out for ice cream—it's…

The Performa3 M106 exhibited two strengths that deserve more detailed discussion. In these areas, the speaker exceeded the performance of any other…