Ham radio Dow Key replacement

Описание: My solution to replacing the old Dow Key antenna TR switch. The Dow Keys have been around over 60 years. Due to age, they are failing, bad coils, worn contacts, etc. Replacing them is pricy. When you do find them, your rolling the dice on how they were treated, plus how much life is left. Another consideration is line voltage. The maximum coil voltage I have seen is 115vac, most are 110. So, I set out to make a replacement. Had to be rugged, plus use currently available components. Goal was to duplicate the function of the famous Dow Key. Bonus of this new design is the open frame Potter & Brumfield relay has a 120vac coil. Operation is smooth and reliable. I have sold 20 of them. Hams are using them with Johnson, Heathkit, B&W plus other transmitters. No problems reported. I make these to order. Currently have a few of each model in stock. As time allows, I have enough parts on hand to make 30 more. Contact me if your interested in one. Price for each model, 4= $110, 5= $120, 6= $135. You may think this is high, however parts are $50 ea, plus 2 hours for assembly. The model 6 more due to the 3 pole relay and layout differences, which add to the build time. Shipping is USA only. I will consider Canada, since the postal rate is acceptable. Other overseas, you will need to use a US shipping agency to handle the paperwork required. Thanks all for the shop support. My contact info is on d-labelectronics.com or you can reach me thru   / dlab_electronics