{"product_id":"replacement-circuit-board-for-tube-holder-s","title":"Replacement Circuit Board for Tube Holder S","description":"The quality of the electron beam in electron defraction tube S (1013889) is affected by the resistance between sockets C5 (cathode) and F4 (heating filament) on the tube. For optimum results, the resistance needs to be 390 kΩ. Tube holder S (1014525) is accordingly designed such that this resistance is present.\u003cbr\u003eOlder designs feature a much smaller resistance and need to be modified in order to work with the new S-series electron deflection tube 1013889).","brand":"3B Scientific Teltron","offers":[{"title":"Default Title","offer_id":49419188666645,"sku":"3BS4008573","price":227.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/4897\/3845\/files\/U99999-611_01_Replacement-Circuit-Board-for-Tube-Holder-S.jpg?v=1761033811","url":"https:\/\/unitedsupplycorp.com\/products\/replacement-circuit-board-for-tube-holder-s","provider":"United Supply Corp.","version":"1.0","type":"link"}