getDefaultAdapter Zend framework 1.10

Question

I have next settings in application.ini

resources.db.adapter = PDO_MYSQL
resources.db.params.host = localhost
resources.db.params.username = some
resources.db.params.password = somepass
resources.db.params.dbname = name
resources.db.isDefaultTableAdapter = true

have 2 similar models Zend_db_table_Abstract in first model i use

$db = Zend_Db_Table::getDefaultAdapter();

all work fine but if i try use same in the second

i see next message

Exception information:

Message: No adapter for type Zend_Db_Statement_Pdo 

i trying take adapter using another methood but i see same Message

trying in class extended zend_db_table_abstract

$this->getDefaultAdapter

Regestry var db in Zend_registry from bootstrap

all time i see same message

Any idea ?