These six AMPEREX 4-400 transmitting tubes were used for a period of time in a Collins and Visual transmitters. If they were duds, that particular engineer would have thrown them out.. In fact the boxed they were contained in, said “used but usable”. The item “AMPEREX 4-400 RF POWER TUBES QUANTITY 6 HAM AMATEUR RADIO VINTAGE” is in sale since Monday, January 08, 2018. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets”. The seller is “2005videoproduction” and is located in Chester, Nebraska. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion.

• Brand: Amperex
• Type: Power Tubes

Heres a pair of made in USA Amperex 221 A SC535A vintage glass two element rectifier vaccum tubes. Since we do not have a tube tester, they are untested. They are a large 9 tall from top to the bottom of the metal (unfortunately not brass) sockets. Great for a special huge tube amp or ham radio project! NOTE: There are some very small chips of glass floating around inside one of the tubes. We could not see any areas of breakage in or out. The maximum 12 photos are included so one could make an accurate evaluation. The original and undamaged tubes as shown (with “AKG” markings intact) are satisfaction guaranteed for 30 days. After this period, they will be considered to be exactly as described, and the sale is then final. The item “Vtg LARGE Pair 9 AMPEREX 221-A (SC 535 A) AUDIO Radio AMP Rectifier VACUUM TUBE” is in sale since Monday, November 04, 2013. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets”. The seller is “allkindagoods” and is located in Mesa, Arizona. This item can be shipped to United States, all countries in Europe, all countries in continental Asia, Canada, Australia.

• Type: Vacuum Tube
• Brand: AMPEREX
• Country of Manufacture: United States
• MODEL NUMBER: 221-A
• ITEM NUMBER: SC 535 A