Howes CR-5 Crystal Radio Set - You may want to take a look on Google and see the very nice review that was written about this CR-5 Crystal Set. The crystal set is built of quality materials and each diode is tested for maximum performance before being used. Most 1N34A diodes do not make it that I test for these radio sets. To operate this set, all one needs is a good antenna, ground connection and pair of 2000 ohm or better headphones. If desired, one could use a small speaker amp. Thanks for looking at what I have to offer.