Primary Bypass Capacitors

[N0WVA]

Are they really needed? Even my HQ110 has them and the instructions warn against a shock from the chassis if not grounded well. Ive noticed that they help regens and DC rigs when used, but is there another way to accomplish this besides adding them to the primary of the transformer?

[DMOD]

Are you referring to the hot and cold lead caps to ground or chassis?

If so, they are mainly used to reduce hash and line noise.

A better way is to use an input line filter.

Phil - AC0OB

[WQ9E]

Replace them with modern line rated caps AND your chassis should always be grounded for safety anyway.  There are many things beyond leaky caps that will cause the chassis to become hot.  For example, last month I finished restoring a Trio TX-310 transmitter to go with my previously working JR-310 receiver and as soon as I plugged in the receiver it blew a fuse.  The power switch had developed a near short to ground while it was sitting on the shelf and had the chassis/case been floating above ground it would have floated up to the AC line level.

The safety advice from older ham radio guides is still very good, "ground should be the first wire connected and the last to be disconnected".

[The Slab Bacon]

The safety advice from older ham radio guides is still very good, "ground should be the first wire connected and the last to be disconnected".

thats also why the ground pin on a 3-prong plug is usually just a tad bit longer

[The Slab Bacon]

Corcom makes some pretty good schtuff, however.....................

You have to determine if your noise is coming in to the receiver on the power line, or being radiated by pwer lines and picked up by the antenna

If it is being radiated by the power lines, there isnt much you can do, you'll be in the same boat I'm in. Also, when using Corcom's filters proper placement and grounding is essential! ! ! ! !