Hey congrats on that amp. Looking forward to your reports. I've actually got two NAD-7020's that don't work, and I have let them sit for far too long. I too was curious about the 3020/7020 sets so I got these some six or seven or more years ago. Since neither 7020 works, an hour or two of checking, revealed that one set had blown OP and driver transistors, while the other one has some serious hum, which probably means I need to replace those four main power supply caps.
Since 3020 and 7020 units are now about 30+ years old, being among the oldest NADs, those power supply caps should be replaced in a 3020 or 7020, to insure proper operation and that it likely comes close to or meets the original specs. The NAD 7020 is quite crowded in there, still I'm going to order some new PS caps, I bought those older Driver and OP transistors some years back, so they should still be around here somewhere, if I can find them!
-Steven
EQUIPMENT:
Turntables: AR-XA, AR-XA w/carbon fiber arm, B&O-4004, Thorens TD-165, TD-145c, Technics SP-15, Sony LX-2, Stanton Belt Drive TT.
Cartridges: B&O SP-12A, MMC-20EN, MMC-20CL, Shure M-95ED, V-15 Type II, V-15 Type III, Audio Technica AT-13xe, A-T DR-300e, A-T Signet 5e, Micro-Acoustics-3002, MA-282e, MA-2002e, MA-QDC-1e, Grado FTE.
CD Players: Magnavox CDB-650, CDB-582, Sony NS-775v, Sony NS-90v, Sony NS-500v, Sony NS-90v Modified, Sony NS-975v Modified, OPPO DV-981HD, Cambridge Audio D-500e.
Preamps: Dynaco PAS-3X Modified, Dynaco PAT-5, Dynaco PAT-5 BIFET, Harmon-Kardon Citation Eleven, Acoustic Research SRC Modified.
Tuners: Dynaco FM-5, Harmon-Kardon Citation IIIx, Harmon-Kardon Citation 14, SUMO Tuner, Yamaha T-80.
Power Amps: My Own Design SET Amp w/5687's, My Own Design SET Amp using 12AX7's and 10BQ5's, Van Alstine Modified Dynaco Stereo 120, Bender Modified Stereo-120.ULT Amp's, B&K-140, Hafler DH-200, Hafler DH-220, Harmon-Kardon Citation 12 Modified, Citation 12 Deluxe Modified.
Integrated Amplifiers: Scott 222c, Heathkit AA-15, Heathkit AA-100.
Modern Receivers: Onkyo-HT-R550, Insignia NS-5100, Sherwood RX-4109.
Vintage Receivers: The AR Receiver, Marantz 2270, Marantz MR-235, NAD 7020, Heath AR-15, Fisher 500c, Harman-Kardon 930.
Speaker Pairs: My Own 4 way design, JBL 4311's, Dynaco A-35's, Dynaco A-25's, KLH-6's, Large Advent Utility's, Leak Original Sandwich Speakers (UK), AR-4x's.
Reel to Reels: Akai PRO-1000, GX-400D, GX-400D-ss, GX-650D, GX-635D, GX-625, GX-255, GX-266D MKII, GX-267D, GX-280D-ss, GX-600DB, M-7, 1700L, 1710W, Kenwood KW-8077, Pioneer RT-707, Pioneer RT-909, Sansui SD-7000, Tandberg 9200Xd, Tandberg 9100X, Tandberg 9000X, Sony TC-366, TC-558, TC-765.