Thanks Barrie for the info. I think the TO-6 might be just the thing I've been looking for. I appreciate the info on the capacitor leakage too. 73, Rick/K5IAR Rick: I've had the TO-6 for many years and it works well for me... The response I liked best (and was closest to what I recall) was less than 50 microamps at full rated voltage.... 73, Barrie, W7ALW