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Brand new original PSVANE Vacuum Tube Model No.: 811A Bakelite tube base Factoty test 6 Months Warranty The price is for 1 PC/lot 1PC Psvane 811A vacuum Tube FU811 Power Valve Lamp For Audio Amplifier DIY HiFi Brand new original PSVANE Vacuum Tube Model No.: 811A Bakelite tube base Factoty test 6 Months Warranty The price is for 1 PC/lot 811A is direct-heated type thorium tungsten cathode high µ triode, can be used as high-frequency oscillation power amplification. 811 is similar to 811A, they can be exchanged each other. Heater Uf--------------------------------------6.3 V If---------------------------------------4 A Maximum Rating Ua--------------------------------------1250 V Ia---------------------------------------125 mA Pa--------------------------------------40W grid current---------------------------------------50 mA Operating frequency and Ua When the operating frequency above 30MC, Ua and anode input power should be reduced as follows: Operating frequency(MC) Ua and anode input power 60 89% 80 70% 100 55% When it is in constant working, the anode should not be allowed to have slight red; when in interrupted working, it should only be allowed to have perceptible slight red. Direct Interelectrode Capacitances Input--------------------------------------5.5 PF output--------------------------------------0.6 PF Grid to plate……………………………………………..5.5 PF Static parameter: Ua……………………………………………………….2000 V -Ug……………………………………………………...2 V Ia………………………………………………………26 mA µ(Ia=20mA)……………………………………..160 Maximum rating in other operating conditions R-F power amplifier or oscillation, C amplifier (CW) CCS ICAS Ua………………………………….1250 1500 V Ia……………………………………175 175 Ma Pa…………………………………..45 65 W Pa (in)……………………………..175 260 W Ug…………………………………-200 -200 V Ig…………………………………..55 50 mA C amplifier anode-modulation, R-F power amplifier CCS ICAS Ua…………………………………1000 1250 V Ia…………………………………..125 150 mA Pa………………………………….30 45 W Pa (in)……………………………115 175 W Ug…………………………………-200 -200 V Ig……………………………………50 50 mA CCS: constant working ICAS: interrupted working A-F power amplifier or oscillation B amplifier, grid driving Maximum Rating CCS ICAS Ua………………………………………………1250 1500 V Ia (max. sig)……………………………….175 175 mA Pa………………………………………………45 65 W Pa (in) (max. sig)……………………165 235 W Recommended operating condition (Reference value) (The value of two tubes) CCS ICAS Ua……………………………………………1250 1500 V Ug…………………………………………….0 -4.5 V Ia (0)…………………………………………50 32 mA Ia (max .sig)……………………………..260 313 Ma Ũg (pk)……………………………………145 170 V Pd (max. sig)…………………………..3.8 4.4 W RL (a-a)……………………………………12.4 12.4 kΩ Pout (max. sig)…………………………235 340 W Payment Delivery details Terms of sales About us Thank you Payment We accept Paypal,Google Pay,VISA,Master Card,Amex,Discover. Delivery details 1.The item will be shipped to you in one or two bussiness days 2.Shipped to United States by SpeedPak ,the shipping time is about 7 to 12 bussiness days,And we also can shipped packages by DHL,UPS or Fedex but you need to pay Extra shipping Cost 3.Shipped to other countrys by China Post E-packet or Other Way ,the shipping time is about 12 to 25 bussiness days All of the shipping items are with tracking numbers Terms of sales The Delivery Schedules Location Delivery Time Working Days (excluded holiday) 5-7 8-11 12-14 15-19 20-22 >25 Working Days + Saturday + Sunday 5-9 10-15 16-20 21-25 26-30 >30 United States Rate (item arrived) 5 .1% 50.1% 29.6% 10.5% 4.7% Refund United Kingdom Rate (item arrived) 9.9% 63.2% 19.1% 3.4% 4.4% Refund Australia Rate (item arrived) 21.4% 50.0% 14.3% 7.2% 7.1% Refund France Rate (item arrived) 10.5% 28.6% 43.8% 10.1% 7.0% Refund Germany Rate (item arrived) 11.1% 22.2% 30.3% 20.9% 15.5% Refund Canada Rate (item arrived) 0.0% 47. 1% 31.4% 17.6% 3.9% Refund Spain Rate (item arrived) 3.5% 25.0% 47.9% 12.9% 10.7% Refund The price do not Include any import taxes or duty, so you need to pay the V.A.T or GST by yourself. We v alue our c ustomers very much .the positive feedback will be left when we upload tracking number to ebay shipping system. Please provide your accurate parcel mailing address to us,in order to shipping item arrive safely and correctly. If Y ou s atisfied w ith o ur p roducts and s ervice, leaving positive feedback is our honour,we appreciate you very much. Please feel free to contact us by ebay message if you have any problems for items or shipping. About us We are the professional seller for HiFi Audio Component, Quality assurance, buy with confidence . Thank you Thank you for visiting our store.