For your consideration, we have a fully serviced, Mcintosh MR71 Stereo FM Tuner in excellent condition. Physically the unit came to us in minty condition, the glass, chrome and panels are in all in great shape with only minor blemishes. The tubes all tested well and most look to be original.
The unit needed a tune up as there was a hum when we took it in. We started by cleaning the unit, including all the tube sockets. We then tested all the tubes using our Amplitrex AT-1000 tube tester. All pots and switches were cleaned, and then treated with Deoxit F5, and D5 respectively. All the electrolytic capacitors were replaced with modern electrolytics. The original multi-cap was faulty and was replaced with one from CE Manufacturing. It matches the look of the original, as CE Manufacturing Can capacitors are made with original vintage Mallory (P.R. Mallory & Co. Inc.) machinery. We also sourced new incandescent festoon bulbs for the dial glass. Finally a full FM alignment was done using our Sencore SG80 AM/FM Stereo analyzer. The final result is a beautiful sounding FM Tuner. We are fortunate to have so many great stations here in Northern NJ, and we enjoyed having the tuner set up in our house system for a few weeks.
The Tuner comes in its original box, that will be double boxed for added protection.
Tubes included with the unit:
MPX OSC 12AU7 Telefunken
MPX Amp 6U8 Telefunken
V1 - 6DS4 (Small Metal Tube)
V2 - 12AT7 Electro Harmonix
V3- 6BN4A Mcintosh (USA)
V4 - V7 6AU6 Mcintosh (General Electric)
V8 - 6CS6 Mcintosh (General Electric)
V10 - 6BN8 Mcintosh (RCA)
V11 - V12 6BL8 Mcintosh (Amperex)
The magic eye indicator and meters were tested and are functioning correctly.
More From Mcintosh:
The Mclntosh MR 71 is a precision engineered, highly sensitive FM Multiplex Tuner. The research staff of Mclntosh Laboratory has developed five new tuner circuit improvements for the MR 71.
1. Automatic stereo-mono switching that is "clickless" and completely electronic. (Patent applied for.)
2. Multipath indicator to eliminate multipath reception by showing when your antenna is rotated to the correct position for minimum multipath distortion.
3. Double tuned input circuits before the first R.F. amplifier to reduce spurious re- sponses.
4. New D'Arsonval movement meters of increased sensitivity which do not need zero setting adjustments.
5. A new computer designed filter to reduce noise from stations broadcasting subcarrier auxiliary music services. No other tuner uses such a filter.