diff --git a/telethon/extensions/threaded_tcp_client.py b/telethon/extensions/threaded_tcp_client.py
deleted file mode 100644
index d97ce6ee..00000000
--- a/telethon/extensions/threaded_tcp_client.py
+++ /dev/null
@@ -1,94 +0,0 @@
-import socket
-import time
-from datetime import datetime, timedelta
-from io import BytesIO, BufferedWriter
-from threading import Event, Lock, Thread, Condition
-
-from ..errors import ReadCancelledError
-
-
-class ThreadedTcpClient:
-    """The main difference with the TcpClient class is that this one
-       will spawn a secondary thread that will be constantly reading
-       from the network and putting everything on another buffer.
-    """
-    def __init__(self, proxy=None):
-        self.connected = False
-        self._proxy = proxy
-        self._recreate_socket()
-
-        # Support for multi-threading advantages and safety
-        self.cancelled = Event()  # Has the read operation been cancelled?
-        self.delay = 0.1  # Read delay when there was no data available
-        self._lock = Lock()
-
-        self._buffer = []
-        self._read_thread = Thread(target=self._reading_thread, daemon=True)
-        self._cv = Condition()  # Condition Variable
-
-    def _recreate_socket(self):
-        if self._proxy is None:
-            self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        else:
-            import socks
-            self._socket = socks.socksocket(socket.AF_INET, socket.SOCK_STREAM)
-            if type(self._proxy) is dict:
-                self._socket.set_proxy(**self._proxy)
-            else:  # tuple, list, etc.
-                self._socket.set_proxy(*self._proxy)
-
-    def connect(self, ip, port, timeout):
-        """Connects to the specified IP and port number.
-           'timeout' must be given in seconds
-        """
-        if not self.connected:
-            self._socket.settimeout(timeout)
-            self._socket.connect((ip, port))
-            self._socket.setblocking(False)
-            self.connected = True
-
-    def close(self):
-        """Closes the connection"""
-        if self.connected:
-            self._socket.shutdown(socket.SHUT_RDWR)
-            self._socket.close()
-            self.connected = False
-            self._recreate_socket()
-
-    def write(self, data):
-        """Writes (sends) the specified bytes to the connected peer"""
-        self._socket.sendall(data)
-
-    def read(self, size, timeout=timedelta(seconds=5)):
-        """Reads (receives) a whole block of 'size bytes
-           from the connected peer.
-
-           A timeout can be specified, which will cancel the operation if
-           no data has been read in the specified time. If data was read
-           and it's waiting for more, the timeout will NOT cancel the
-           operation. Set to None for no timeout
-        """
-        with self._cv:
-            print('wait for...')
-            self._cv.wait_for(lambda: len(self._buffer) >= size, timeout=timeout.seconds)
-            print('got', size)
-            result, self._buffer = self._buffer[:size], self._buffer[size:]
-            return result
-
-    def _reading_thread(self):
-        while True:
-            partial = self._socket.recv(4096)
-            if len(partial) == 0:
-                self.connected = False
-                raise ConnectionResetError(
-                    'The server has closed the connection.')
-
-            with self._cv:
-                print('extended', len(partial))
-                self._buffer.extend(partial)
-                self._cv.notify()
-
-    def cancel_read(self):
-        """Cancels the read operation IF it hasn't yet
-           started, raising a ReadCancelledError"""
-        self.cancelled.set()