Oil 4 Less® LLC is a Veteran-Owned Small Business with ten years experience in providing quality shunt regulator replacements to the Victoreen Corotron™ . Active in SAM; Registration valid until 2021-02-03 VOSB verified to 2/27/2021 We are the sole manufacturers of the Codatron® High Voltage Zener. View our site at https://oil4lessllc.com/. Our low noise Codatron® high voltage zener is capable of operation to 204 degrees Centigrade / 400 degrees Fahrenheit, translating to longer lifetime, higher reliability, and lower cost of use. The low noise allows decreased bench set-up time and more reliable data for analysis; both benefits translating to greater profitability. It is designed to be easily programmable to any of the popular voltages used in photomultiplier applications such as radiation detectors and downhole neutron detectors; users have found our Codatron® to be quieter than the Corotron™. Pricing for 50V to 1250V regulators restored due to increase in costs. The "A" grade pricing increment of $25 will remain. Same discounts: 10% from 10-49, 15% from 50-99, 20% from 100 up. 50V - 1250V $225 qty 1-9 1300V - 2500V $247.50 qty 1-9 Free shipping. Our recent improvement, revision F, is programmable in 10V steps, resulting in greater precision. No discounting as seen above. Pricing is the original $225.00 despite the greater fabrication and testing costs.