Mike Hrapek's Sets

K3MIC's Homemade Crystal Radios

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Today (2/26/05), I heard that Mike passed away last summer. Before Mike went, he made some really nice looking crystal sets. To his honor I dedicate his page on my website.


Skywave Super Ryder

K3MIC's Homemade Crystal Radios
K3MIC's Homemade Crystal Radios
K3MIC's Homemade Crystal Radios
K3MIC's Homemade Crystal Radios
K3MIC's Homemade Crystal Radios
K3MIC's Homemade Crystal Radios

Mike has built a top notch looking crystal set that I am proud to bring to everyone else. There are pictures to show the detail of the dial string coil tuning system. Great set, Mike!

I can get between 10 and 15 stations and they are pretty much selective by the variable cap. Using the 2 sliders will also help in bringing out that hard to hear station buried in noise or other stations. I have built several radios using this circuit with very good results. I live in West Virginia and one evening I was able to hear a distant station on standard am in California. I only heard it one time so propagation must have been just right to hear it. There was a lot of QSB that night, so stations were popping in and out from all over.

The wood was bought at Wal-Mart in their crafts section. So anyone wanting to build a similar looking radio can get the wood for under $5.

The lettering was done by computer. I used a computer scanner to scan the face plate after the holes were drilled so I could get an accurate layout of all lettering. I then used the Avery 8665 Clear Full Sheet Labels paper to print on. Then using a pair of scissors I cut the lettering in one full sheet to fit the face plate. The label paper has a sticky side, so care must be used when applying it to the wood surface so as not to get it off center or any air bubbles or wrinkles in it. The wood face plate is first varnished and sanded smooth, then apply the label, then wait one day for the ink to dry and then varnish to seal the label.

The shafts for the tuning of the sliders are made from 1/4 inch doll rod. The string is actually bought at Wal-Mart in the sporting goods section and is fly fishing nylon cord. The brass square stock I was able to pick up from a local hobby shop and bought 2 sizes so that one fits snugly over the other. About a 1 inch piece is used for the slider with a part of a bobby pin as the actual contact to the coil. A bobby pin is great because of it being ridged, but flexible and able to maintain it's shape once bent to the configuration needed. The brass rod for wiring the radio was also bought at the same hobby shop. A high gloss varnish finished off the radio. It really makes a nice looking set.

KKR VIII


KKR VII Built by K3MIC

K3MIC's Homemade Crystal Radios

Tuner

Open front view

K3MIC's Homemade Crystal Radios

K3MIC's Homemade Crystal Radios

Mike's Roll Top Set

Open

K3MIC's Homemade Crystal Radios

K3MIC's Homemade Crystal Radios

King Crystal Radio

K3MIC's Homemade Crystal Radios

K3MIC's Homemade Crystal Radios

K3MIC's Homemade Crystal Radios

K3MIC's Homemade Crystal Radios

K3MIC's Homemade Crystal Radios