Check the listing for details. matched Quad PSVANE KT88-T Mark II classic grade Tubes replace CV5220 6550 KT88. Condition: New. Listed at 339.00 USD. 1 matched Quad PSVANE KT88-T Mark II classic grade Tubes remove CV5220 6550 KT88-TII is a beam power tetreode, its anode limited dissipation power is 42W. In the audio amplifier, the power can be 100W when it is used as push-pull class AB1 with double tubes, it can also be used in electronic voltage regulator circuit. KT88-TII is similar with CV5220 and 6550,they can be replaced by each other. Package listing:KT88-T Mark II Tube*4pcs (matched quad ) HeaterUf ……………6.3 VIf…………………………1.6 AMaximum Rating Ua……………………800 VUg2………………600 VUg1………………-200 VPa………………42 WPg2…………8 WUa+g2…………46 WIk……………………230 mAUh-k……………200 VTbulb…………………250 CRg1 with cathode bias Pa+Pg2≤35W 0.47 MΩPa+Pg2 > 35W 0.27 MΩwith fixed biasPa+Pg2≤35W 0.22 MΩPa+Pg2 > 35W 0.10 MΩDirect Interelectrode Capacitances tetrode connection triode connectioninput………16 9.3 PFoutput ……… 12 17PFgrid to plate………1.2 7.9 PF tetrode connectionUa…………………… 250 VUg2……………………250 VIa ……………………140 mAIg2(approx) ………3 mA-Ug1(approx)………15 VGm ……………………12 mA/Vri ……………………12 KΩUg1-g2……………… 8ri ……………………670 Ωu………………………8triode connectionUa.g2…………………250 VIa+g2…………………143 mA-Ug1(approx)………15 VGm ……………………12 mA/V Payment:1. All payment must be prepaid. 2. We only accpet payment via paypal. Please kindly check if you can do the payment via paypal before placing an order.Shipping1. We are not responsible for undeliverable address. We reserve the right to charge the shipping fee again for returned item due to wrong address. 2. Item are generally shipping out within 2 working days after your payment have been cleared. We ship on Monday to Friday (excluding Public Holidays). 3. Orders from the HongKong or Shenzhen will all be shipped out via the post postal. 4. We Ship to Worldwide, except the excluding country. Most delivered 10-30 business days.Returns1. We offer 30 days money back guarantee return policy. 2. We will responsible for the postage of damaged replacements. Refund will be made upon receipt of the returned item.