diff --git a/quixstreams/sources/base/manager.py b/quixstreams/sources/base/manager.py
index 649478ba2..4d4b8e65c 100644
--- a/quixstreams/sources/base/manager.py
+++ b/quixstreams/sources/base/manager.py
@@ -5,8 +5,10 @@
 from typing import List
 
 from quixstreams.logging import LOGGER_NAME, configure_logging
-from quixstreams.models import Topic
+from quixstreams.models import Topic, TopicAdmin
 from quixstreams.models.topics import TopicConfig
+from quixstreams.rowconsumer import RowConsumer
+from quixstreams.rowproducer import RowProducer
 from quixstreams.state import RecoveryManager, StateStoreManager, StorePartition
 from quixstreams.state.memory import MemoryStore
 
@@ -27,10 +29,17 @@ class SourceProcess(multiprocessing.Process):
     Some methods are designed to be used from the parent process, and others from the child process.
     """
 
-    def __init__(self, source, topic, producer, consumer, topic_manager):
+    def __init__(
+        self,
+        source: BaseSource,
+        topic: Topic,
+        producer: RowProducer,
+        consumer: RowConsumer,
+        topic_manager: TopicAdmin,
+    ):
         super().__init__()
         self.topic = topic
-        self.source: BaseSource = source
+        self.source = source
 
         self._exceptions: List[Exception] = []
         self._started = False
@@ -48,7 +57,7 @@ def __init__(self, source, topic, producer, consumer, topic_manager):
         self._rpipe, self._wpipe = multiprocessing.Pipe(duplex=False)
 
     @property
-    def started(self):
+    def started(self) -> bool:
         return self._started
 
     # --- CHILD PROCESS METHODS --- #
@@ -124,7 +133,7 @@ def _recover_state(self, source: StatefulSource) -> StorePartition:
             store_type=MemoryStore,
             topic_config=TopicConfig(
                 num_partitions=source.store_partitions_count,
-                replication_factor=1,
+                replication_factor=self._topic_manager.default_replication_factor,
             ),
         )
 
@@ -240,7 +249,7 @@ def register(
         producer,
         consumer,
         topic_manager,
-    ):
+    ) -> SourceProcess:
         """
         Register a new source in the manager.
 
diff --git a/quixstreams/sources/base/source.py b/quixstreams/sources/base/source.py
index a56a61c71..383b3d331 100644
--- a/quixstreams/sources/base/source.py
+++ b/quixstreams/sources/base/source.py
@@ -411,7 +411,7 @@ def assigned_store_partition(self) -> int:
         return 0
 
     @property
-    def store_name(self):
+    def store_name(self) -> str:
         """
         The source store name
         """