The buyer's jaw dropped when he heard the music, which made me question if I should be selling them. Yesterday I sold my Tekton Lores and used the M-22 in my chain during the audition. Large caps are less able to bypass high frequencies than smaller caps, so it has been customary in modern times to add a small, high-quality film cap to large electrolytics to shore up their high frequency performance." The Mundorf caps will be connected in parallel with the big filter caps up top. Same goes for the transistors and power transformers. /oct dB /oct SLOPE SLOPE SLOPE POWER ELECTRONIC CROSSOVER NETWORK D-23 LEVEL CONTROLS MEMORY MARKERS (LOW, MID-LOW, MID-HIGH, HIGH) These markers will prove very useful in marking pre selected levels for comparison purposes and other fine These controls are for adjusting output levels of each adjustments. The resistors all look good and therefore should not wear out for many decades (or centuries) unless they are overloaded by a parts failure. They are not causing problems with signal dropouts at this point, but they will at some point in the future. These are still functional, but they will probably be the next item to give trouble.
The only other parts that have a wear factor are the 4 trimpots for bias and DC offset. So you are in good shape for another 30 years, or until the big filter caps up top get leaky. The parts replaced are all electrolytic caps, which have a finite lifespan. The parts replaced by the previous tech are good parts, and I see nothing done that is not within spec. I plan to do the same for the RCA jacks, and anything else that shows oxidation. "All of the connector pins (about 5 dozen) have been polished, and Deoxit has been applied. I figured this info may be helpful to others that are looking to have their M-22 serviced.
PIONEER D23 CROSSOVER MOD
Aside from the repair and cleaning, the only mod was to have some Mundorf caps installed (detailed in Scott's last paragraph). Sounds fantastic, better than ever! Turns out the amp had been restored before I bought it, although probably some time ago. Come visit US Audio Mart and post your hifi classifieds. Got my M-22 back from Scott Frankland a week ago, and have been running it in over the past few days. Attention American Visitors Weve just launched a dedicated AudioMart in United States, US Audio Mart.
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