Valve Distorting Vca Problems

To test the TL071 you can build a voltage follower on a solderless breadboard (or if you don’t have one, use a small piece of stripboard and a DIP socket):


Any voltage you put at INPUT (-8 to +10 V) should give the same voltage at OUTPUT.

If the tube doesn’t show signs of physical damage it’s likely to be OK.

For further troubleshooting refer to: