Due to a server reboot I lost several of my amidxtaped.<timestamp>.debug 
files.
Therefore I have some problems while recovering of some files now:
output_of_amrecover $
...
Extracting files using tape drive /dev/nst0 on host ultra.
Load tape check001 now
Continue [?/Y/n/s/t]? Y
EOF, check amidxtaped.<timestamp>.debug file on ultra.
amrecover: short block 0 bytes
UNKNOWN file
amrecover: Can't read file header

Can somebody shed some light on this? What's the recommended way to extract 
the requested files?

Thank you in advance.
-- 
Uwe.