Tape backups "stuck" in controlfile

At one point, there was a tape backup device configured and working. This tape device has since been removed, but there are still backups that were done to tape that are in the controlfile. These backups are quite old and rman knows they are obsolete, but it can't delete them, since the tape device (and channel) no longer exists.
I have tried many ways of trying to delete them, but I consistently end up with the same result of:
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of delete command at 09/11/2007 13:10:06
RMAN-06091: no channel allocated for maintenance (of an appropriate type)
I am able to allocate a channel type of disk, but not sbt because it is not there, so I am having trouble getting rid of these entries. Any help is appreciated. Here is my configuration:
RMAN> show all;
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION OFF;
CONFIGURE DEFAULT DEVICE TYPE TO DISK;
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 4;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT '/backup1/oracle/%U';
CONFIGURE CHANNEL 2 DEVICE TYPE DISK FORMAT '/backup1/oracle/%U';
CONFIGURE CHANNEL 3 DEVICE TYPE DISK FORMAT '/backup1/oracle/%U';
CONFIGURE CHANNEL 4 DEVICE TYPE DISK FORMAT '/backup1/oracle/%U';
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/10.2.0.2/dbs/snapcf_test1.f'; # default

I was encountering the same:
RMAN> delete obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=149 devtype=DISK
Deleting the following obsolete backups and copies:
Type Key Completion Time Filename/Handle
Backup Set 1385 17-DEC-09
Backup Piece 1385 17-DEC-09 BE_bcl15skg_1_1
Backup Set 1386 17-DEC-09
Backup Piece 1386 17-DEC-09 BE_bdl15sog_1_1
Backup Set 1387 17-DEC-09
Backup Piece 1387 17-DEC-09 BE_bel15t6o_1_1
Backup Set 1570 08-FEB-10
Backup Piece 1570 08-FEB-10 BE_h5l5hl8f_1_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of delete command at 02/18/2010 16:12:29
RMAN-06091: no channel allocated for maintenance (of an appropriate type)
RMAN> list backup summary;
List of Backups
===============
Key TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
1387 B 0 U SBT_TAPE 17-DEC-09 1 1 NO TAG20091217T230904
1390 B A U SBT_TAPE 18-DEC-09 1 1 NO TAG20091218T230709
1392 B 0 U SBT_TAPE 18-DEC-09 1 1 NO TAG20091218T231024
1393 B A U SBT_TAPE 18-DEC-09 1 1 NO TAG20091218T231803
1395 B A U SBT_TAPE 21-DEC-09 1 1 NO TAG20091221T230506
1397 B 0 U SBT_TAPE 21-DEC-09 1 1 NO TAG20091221T230700
1398 B A U SBT_TAPE 21-DEC-09 1 1 NO TAG20091221T231439
1564 B A U SBT_TAPE 05-FEB-10 1 1 NO TAG20100205T232055
1565 B F U SBT_TAPE 05-FEB-10 1 1 NO TAG20100205T232057
1566 B A U SBT_TAPE 08-FEB-10 1 1 NO TAG20100208T230856
1569 B A U SBT_TAPE 08-FEB-10 1 1 NO TAG20100208T231941
1570 B F U SBT_TAPE 08-FEB-10 1 1 NO TAG20100208T231943
RMAN> change backuppiece tag 'TAG20091217T230904' uncatalog;
uncataloged backuppiece
backup piece handle=BE_bel15t6o_1_1 recid=1387 stamp=705885402
uncataloged backuppiece
backup piece handle=BE_bdl15sog_1_1 recid=1386 stamp=705884946
Uncataloged 2 objects
RMAN> change backuppiece tag 'TAG20091218T230709' uncatalog;
uncataloged backuppiece
backup piece handle=BE_bhl18h1g_1_1 recid=1390 stamp=705971249
Uncataloged 1 objects
RMAN> change backuppiece tag 'TAG20100208T231943' uncatalog;
uncataloged backuppiece
backup piece handle=BE_h5l5hl8f_1_1 recid=1570 stamp=710464784
Uncataloged 1 objects
RMAN> list backup summary;
RMAN> list backup;
RMAN> list backupset;
RMAN> delete obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
using channel ORA_DISK_1
Deleting the following obsolete backups and copies:
Type Key Completion Time Filename/Handle
Backup Set 1385 17-DEC-09
Backup Piece 1385 17-DEC-09 BE_bcl15skg_1_1
Backup Set 1388 17-DEC-09
Backup Piece 1388 17-DEC-09 BE_bfl15t70_1_1
Backup Set 1389 17-DEC-09
Backup Piece 1389 17-DEC-09 BE_bgl15t75_1_1
Backup Set 1394 18-DEC-09
Backup Piece 1394 18-DEC-09 BE_bll18hle_1_1
Backup Set 1399 21-DEC-09
Backup Piece 1399 21-DEC-09 BE_bql1gej1_1_1
Backup Set 1404 22-DEC-09
Backup Piece 1404 22-DEC-09 BE_bvl1j2ra_1_1
Backup Set 1409 23-DEC-09
Backup Piece 1409 23-DEC-09 BE_c4l1lnak_1_1
Backup Set 1414 24-DEC-09
Backup Piece 1414 24-DEC-09 BE_c9l1obqf_1_1
Backup Set 1419 25-DEC-09
Backup Piece 1419 25-DEC-09 BE_cel1r0a2_1_1
Backup Set 1424 28-DEC-09
Backup Piece 1424 28-DEC-09 BE_cjl22t64_1_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of delete command at 02/18/2010 16:15:05
RMAN-06091: no channel allocated for maintenance (of an appropriate type)
RMAN> change backuppiece 'BE_bcl15skg_1_1' unavailable;
changed backup piece unavailable
backup piece handle=BE_bcl15skg_1_1 recid=1385 stamp=705884819
Changed 1 objects to UNAVAILABLE status
RMAN> change backuppiece 'BE_bcl15skg_1_1' unavailable;
changed backup piece unavailable
backup piece handle=BE_bcl15skg_1_1 recid=1385 stamp=705884819
Changed 1 objects to UNAVAILABLE status
RMAN> change backuppiece 'BE_bcl15skg_1_1' uncatalog;
uncataloged backuppiece
backup piece handle=BE_bcl15skg_1_1 recid=1385 stamp=705884819
Uncataloged 1 objects
RMAN> change backuppiece 'BE_bfl15t70_1_1' uncatalog;
uncataloged backuppiece
backup piece handle=BE_bfl15t70_1_1 recid=1388 stamp=705885409
Uncataloged 1 objects
RMAN> delete obsolete ;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
using channel ORA_DISK_1
no obsolete backups found
FINALLY FIXED!!!

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Hi All,
First of all let me thank you to the forum from which I keep updating my knowledge on oracle.
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channel ch00: looking for autobackup on day: 20110803
channel ch00: looking for autobackup on day: 20110802
channel ch00: looking for autobackup on day: 20110801
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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Check this link
restore spfile to another host
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Dear Gurus,
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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# included on 21Jan2011 at 9:18 PM
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CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 3 DAYS;
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RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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Tape backups "stuck" in controlfile

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