| Pioneer Series20 M-22 Amplifier  "My fave 25W class A amp is the Pioneer M-22. It offers a perfect balance of detail and musicality with a truly holographic soundstage. I like it better than the M-03, DR-2, DR-3 and Bedini for driving my classic Bozaks." - P.B. Japanese-to-English Translation  The power amplifier which Pioneer sells in 1976. Power amplifier in "20th series" of system amplifier. Also it is the product which is located but, the spirit which is designed with the power source section and the heat dissipation section of the output step that way as bare. In style, the output step of pure Class-A operation of the exclusive M-4 transferring was loaded, the power amplifier of capability group. M-22 to be adopted all-stage Class-A operations, differential 2-step current-mirror circuit, 2-step Darlington Parallel-Push-Pull. The circuit constitution, purity complimentary OCL was taken. As for differential amplification of input, fluctuation of voltage was held down, stability was raised and the distortion had been decreased. Using the dual transistor, it assured the stabilization of point electric potential in expansion. The pre-driver step with the Push-Pull drive with the current-mirror circuit, bets moderate NFB on this circuit. It was warped low by and assured conversion. Furthermore, as for the output step lightening the burden of each transistor to a Parallel-Push-Pull constitution, the output which it stabilizes profit. In addition, quality of the very little output time has been improved to the pre-driver step as a stabilization power source supply. In addition, when you look at the whole circuit, low having become the DC amplifier constitution which does not have limits time constant inside the NFB loop, it was superior. Limits playback ability was actualized low. Like above by the circuit, with pure Class-A operation 30W + 30W (10Hz - 30KHz 8 Ω) output and 0.01% (time 10Hz of effective output - 30kHz) to be warped low, output bandwidth 5Hz - 100kHz. The quality which (IHF both ch drive distortion factor 0.01%) with you say and is superior was actualized.  The power source section, adopting 2 power transformer constitution of L/R independence, had removed the mutual interference in channel to channel. The condenser had become constitution of the bulk, 33000 μF × 4. The protection network had adopted those where the reliability which is formed in the electronic circuit whose power relay and response are quick is high. Parallel connecting dual contact points, to raise reliability, furthermore in L/R independence. It had become the constitution which also deterioration of prevents. Like above, as for M-22, in the chassis which die-cast make does firmly, the radiator and the powerful power source section of die-cast make. It loaded, the high performance which loads the output step of Class-A operation with spirit style.
AllegroSound (Est.1973) Los Angeles, California USA Rick@AllegroSound.com  FOR SALE / TRADE  HOME / master-Index * AllegroSound et al assumes no responsibility for the use or misuse of products, services, info, etc. |
