Hi All, Russian GS35b triode is close to 8877 and works up to 1000MHz and able to run 1.5kW easy with 3kV plate voltage. It is able to work with 4kV and even 4.5kV plate voltage. NOS Russia made tube cost $120. GS35b has also its 1kW version GS31b. It runs 1200W on HF without problem and cost $100. My QRO Parts Site: http://www.ur4ll.net Best regards, Alex, UR4LL KO70XG