VACUUM TUBES - 6550 RUSSIAN TUNG-SOL - FACTORY MATCHED PAIR

Description: === TONS OF HI-RESOLUTION PICTURES AFTER THE LISTING DETAILS AT THE BOTTOM. BE SURE "NOT" TO MISS THEM! === ------------------------------------------------------------------------------- PLEASE REMEMBER: NICE/RARE ITEMS AND GOOD SERVICES AREN'T CHEAP AND NEVER ARE THEY FREE!!! BUT, WE STRIVE FOR 100% CUSTOMER SATISFACTIONS AND OUR EBAY FEEDBACKS & INTERNATIONAL REPEATED REFERALS SPEAK FOR THEMSELVES!!! OUR EBAY TRANSACTIONS REPRESENT ABOUT 10% OF OUR OVERALL BUSINESS VOLUME, WHICH THE REST (OF THE 90%) ARE DIRECT AND VIA REFERALS! ------------------------------------------------------------------------------- FOR SHIPPING ANYWHERE IN THE U.S. AND WORLDWIDE, - HOW WE PACK - & - HOW WE CRATE - !!! SHIPPING QUOTE INCLUDES PALLETIZING & GROUND FREIGHT/INSURANCE/DELIVERY TO 48-US DESTINATIONS. CONTACT FOR OTHERS OR DIFFERENT SERVICE! >>>>>> LINK TO OUR PAST PROJECTS & SALES!!! ------------------------------------------------------------------------------- LOCAL AUDITION & DELIVERY ARE POSSIBLE & NEGOTIABLE. POTENTIAL/SERIOUS BUYERS ARE WELCOMED TO COME AND AUDIT FOR COMPLETE SATISFACTION. FOR SALE IS ONE SET OF 2 FACTORY MATCHED 6550 COKE BOTTLE GLASS RUSSIAN-MADE TUBES, IN FACTORY BOXES. MY CUSTOM CURVE TRACING TESTER RESULTS SHOW READING VS. DATASHEET SPEC'S VALUES OF 140mA / 11.5mA/V @ -15V GRID BIAS. THE TWO PLATE CURVES VS. BIAS ARE NOT PERFECTLY IDENTICAL BUT STILL PRETTY NICE. PLATE CURRENTS WERE TRACED FROM 0 TO ABOUT 190mA! TUBE #1 - MARKER @ -15V BIAS READS 127.6mA (91.1% NOS) & 11.33mA/V (98.5% NOS). TUBE #2 - MARKER @ -15V BIAS READS 111.7mA (79.8% NOS) & 10.13mA/V (88.1% NOS). TUBE #1 - MARKER @ -23.9V BIAS READS 47mA & 6340uA/V. TUBE #2 - MARKER @ -22.6V BIAS READS 47mA & 6130uA/V. FOR POWER TUBES - ESPECIALLY AT MODERATE TO HIGH PLATE CURRENT OPERATIONS, MATCHING PLATE CURRENTS ARE MUCH MORE IMPORTANT! THE FACRTORY MATCHING TEST RESULTS ARE BELOW: (PLATE CURRENT IN mA / MUTUAL CONDUCTANCE IN mA/V or mMhos) #1 47.0 mA / 6300 uA/V #2 47.0 mA / 6300 uA/V PLATE CURRENTS AND TRANSCONDUCTANCES MATCHED PERFECTLY WITHIN LIMITS OF THE TEST EQUIPMENT! MY GUESS IS THAT THE FACTORY SCREENED & TESTED THE TUBES AT MUCH LOWER BIAS TO RECORD SUCH LOW LEVEL OF PLATE CURRENT AND MUTUAL CONDUCTANCES. MY TEST RESULTS ARE AGAINST THE DATASHEET SPEC'S TYPICAL CONDITIONS AND SHOW A PERFECT MATCH AT ALL POINTS ALONG THE BIAS RANGE WITH VERY STRONG READINGS! IF THE BUYER CANNOT TEST THE TUBES IN THE SPECIFIED CONDITIONS AND ARE UNFAMILIAR WITH THE ACTUAL WORKING OF TUBE EQUIPMENT - PLEASE DO ME A FAVOR AND "DO NOT" PURCHASE THESE TUBES. I DON'T SPEND MY TIME BACK & FORTH WITH UNINFORMED BUYERS - ARGUING THE OBVIOUS DETAILS!!! I CAN RUN THESE TUBES THROUGH A TV-7 TESTER BEFORE SHIPPING OUT - SO THE BUYER CAN REPEAT & CORRELATE THE RESULTS ON ANOTHER TV-7. BUT THEN AGAIN - MY TESTER WAS REBUILD AND CALIBRATED BY "THE" TV-7 GURU WITH PLATE CURRENT METER & UPGRADES - SO UNLESS THE BUYER'S TV-7 HAS BEEN REBUILT/CALIBRATED RECENTLY, I DO NOT WANT TO ARGUE TEST RESULTS!!! JUST PLEASE DO ME A FAVOR, BUY SOMEWHERE ELSE! STABLE & SOLID READINGS. NO LEAKS. NO GAS. NO GRID/SCREEN CURRENTS. ETC. I HAVE SEVERAL CUSTOM & STANDARD RIGS - INCLUDING MAXI-MATCHER & AMPLITREX & CUSTOM TEST/BURN-IN RIGS - TO MATCH TUBES CLOSE TO REAL PLATE VOLTAGE IF DESIDED! I WELCOME LOCAL PICK-UPS, BUT CASH PAYMENT ONLY PLEASE - UNLESS PRIOR ARRANGEMENTS HAVE BEEN AGREED UPON REGARDING PAYMENT METHOD ACCEPTED. DIRECT CREDIT CARD BILLINGS IS AVAILABLE, WITH THE SAME APPLICABLY STATED SALES TERMS. LOCAL PICK-UPS OR SHIPPING TO CA/AZ DESTINATIONS ARE SUBJECTED TO CA/AZ SALES TAX. ==> VTM-200'S - "ARCDB" ==> STEREOPHILE REVIEW" --> ITEMS ARE FOR SALE AT SEVERAL VENUES AS WELL AS LOCALLY. THUS - AS ALONG AS THERE ARE NO EXPLICIT AND/OR OUTSTANDING EBAY'S BIDS/OFFERS, THESE ITEMS ARE ON A 1ST-COME 1ST-SERVE BASIS. ANY CURVES IN THE PICTURES ARE DUE TO THE DISTORTION IN MY CAMERA'S CLOSE-UP LENS. NO ISSUES WHATSOEVER. ANY QUESTIONS, PLEASE CONTACT ME THROUGH EBAY'S MESSAGE SYSTEM. THANKS. OTHER ITEMS FOR SALE WE CAN BOX/CRATE THESE UNITS UP AND SHIP TO ANY DESTINATION, AS LONG AS THE BUYER PAYS FOR THE SHIPPING AND FULL INSURANCE COSTS. WE USE FEDEX DOMESTIC & INTERNATIONAL SERVICES OR AIR/OCEAN FREIGHT SERVICES FOR ITEMS OVER 150lb. PLUS, WE CAN ALSO USE THE BUYER'S OWN CARRIER (HOWEVER, THIS SHIPMENT WOULD THEN BE F.O.B IN THIS CASE AND WE ARE NOT RESPONSIBLE AFTER THE CARRIER'S PICK-UP). WORLDWIDE SHIPPING. INTERNATIONAL SHIPMENT IS MORE EXPENSIVE SINCE IT IS TIME CONSUMING TO DEAL WITH THE SHIPPING & CUSTOM DETAILS. THESE ITEMS WILL GO VIA FEDEX GROUND FOR THE 48 US CONT. DESTINATIONS. OTHER DOMESTIC & INTERNATIONAL DESTINATIONS ARE HIGHER. ------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -->

Price: 145 USD

Location: Phoenix, Arizona

End Time: 2024-08-29T05:49:34.000Z

Shipping Cost: 19 USD