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eBay EL34 KT88 300B Push-pull 4-way Grid Negative Pressure Adjustable Circuit Board Description: EL34 electronic tube push-pull machine with adjustable grid negative pressure circuit board: double-sided high-frequency fiberglass circuit board, thickness 1.6mm, size 120×47mm. Classic circuit, AC 60V～80V power supply, full bridge rectification, secondary filter, equipped with 200V filter electrolysis, imported domestic metal film resistor or high-quality domestic Dahongpao resistor, domestic organic solid adjustable potentiometer or 3296 multi-turn adjustable, for 4 A EL34/300B/2A3 electron tube grid negative voltage adjustment, adjust the tube working current. Changing the power supply voltage, changing the resistance of the four potentiometers, can change the negative voltage adjustment range, adapt to a variety of different electronic tubes, and have strong applicability. Affirmation: Due to different batches, the color of the board will be different, not to choose. If the component parameters on the board are different from the schematic diagram, the component parameters assembled on the board shall prevail! Package including: 1PCS EL34 KT88 300B Tube Push-pull 4-way Grid Negative Pressure Adjustable Circuit Board PaymentDelivery detailsTerms of salesReturnContact us Payment We accept payment by PayPal only. Payment must be received within 7 days after auctions ended. Delivery details Items will be shipped within 1-2 business days when we received payment. Shipping to USA takes about 8-15 days in normal condition,other countries takes about 15-35 days. Please verify your eBay primary shipping address. We are not responsible for any wrong or undeliverable addresses. Terms of sales All items will be checked before packing Your feedback and 5 star ratings are much appreciated. If you are unhappy with your purchase, please contact us on negative / neutral feedback or low star ratings. Return If you receive an item is damaged or defective, we will refund you or replace it with identical one. All damaged or defective items may be exchanged within 30 days. Contact us We take full responsibility if you receive wrong item or damaged item or item not as describled. If you’re not satisfied for any reason, please feel free to contact us. Just send us an eBay message.

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