The Article by Brian Beezley (
http://ham-radio.com/k6sti/index.html or
http://ham-radio.com/k6sti/hdrsn.htm) has a list of tuners that have an effective circuit already in them (there may be others):
Tuner The last solution is simply to buy another tuner. Few home tuners are marketed these days, but high-quality used tuners are readily available.
Receiving an HD Radio signal in stereo at full IF bandwidth without self-noise requires a postdetection filter or special stereo decoder. The U.S. version of each tuner listed below has one or the other, or both. Before buying a tuner, check with someone who owns one to verify the effectiveness of its self-noise rejection. Surely the list is incomplete.
Postdetection Filter
ADS T2
Aiwa AT-9700
Akai AT-93 AT-K03 AT-S55 AT-V04
AMC T7
Arcam Alpha 5 Plus Alpha 7 Alpha 8 T21 T51
Audiolab 8000T
Carver TX-11
DaySequerra FMR 25
Denon TU-600 TU-650RD TU-660 TU-680NAB TU-767 TU-800 TU-1500RD UTU-F10
Dynaco AF-6
Heathkit AJ-15
Hitachi FT-007 FT-3500 FT-4400 FT-5500MKII FT-8000
Kenwood 600T BASIC T2 KT-9XG KT-80 KT-615 KT-770 KT-880D KT-900 KT-917
KT-1000 KT-1100 KT-3050 KT-5020 KT-6040 KT-6050 L-01T L-02T L-07TII
Klein + Hummel FM 2002
KLH Eighteen
Luxman T-117 T-230 T-240 T-400 TX-101
Marantz 2130 ST-8 ST-17 ST551
McIntosh MR71 MR73 MR74 MR77 MR78
NAD 4155 4300
Onkyo T-35 T-407 T-450RDS T-909 T-4017 T-4057 T-4087 T-4150
T-4500 T-4700 T-4711 T-9060 T-9090 T-9090II T-G10
Phase Linear T 5200
Philips AH180 FT930
Pioneer F-9 F-X700 TX-05 TX-950 TX-8500II TX-9100
Quad FM3
Revox B160 B260 B260-S B261 B760 H6
Rotel RHT-10 RT-830A RT-850 RT-850A RT-870 RT-940AX
RT-950BX RT-955 RT-970BX RT-990BX RT-1080
Sansui TU-517 TU-717 TU-719 TU-919 TU-S5 TU-S9 TU-S55X TU-X1
Sony ST-J55 ST-J75 ST-S555ES
Sumo Charlie
TAG McLaren T32R
Technics ST-G7
Product Detector
Kenwood KT-990D KT-990SD KT-1100SD KT-3300D KT-7020 L-1000T
Rotel RHT-10 RT-990BX
Yamaha T-85 TX-1000 TX-2000
Harmonic Canceller
Denon TU-680NAB
NAD C420 C422 C425 C426
Onkyo T-405TX T-405X
Primare T21
Sansui TU-D99X TU-D99AMX TU-S77X TU-S77AMX
Digital Direct Decoder
Pioneer F-51 F-77 F-90 F-91 F-93 F-99X F-401 F-449 F-656 F-717
Digital Signal Processing
Accuphase T-1000 T-1100 T-1200