TOSHIBA 6DJ8 ECC88 M3624 VACUUM TUBE 1960 ' S WARM SWEET JAPANESE PRECISION
Item History & Price
TUBE HUNTER VACUUM TUBE GEMS
THESE ARE THE SPECIFICS OF THE TUBE/TUBES/PARTS FOR SALE
THESE ARE THE TUBE/TUBES/PARTS FOR SALE:
MANUFACTURER: GEPRODUCTION CITY: MATSUSHITA
TUBE TYPE: 6DJ8 ECC88DESIGNATION: &...nbsp; M3624
YEAR: 1960's
MONTH:
Date code match
SILK SCREEN CONDITION %: 100%MICA: 2
PLATES: GREY
GM %: 121%, 120%, AND 123%, 122%
SINGLE/PAIR/QUAD/MULTI: PAIRGETTER: O GETTER
DATE CODE
THESE TUBES HAVE BEEN CURVE TRACER MATCHED. THECURVES SHOWN IN THE PICTURES ARE OF EACH TRIODE. EXAMINE THE CURVES FORLINEARITY. THE gm PERCENTAGES IN THE TABLE ARE FROM THE B&K 747B I USED FORNORMAL TESTING.CURVE TRACER MATCHED!!! TESTINGACCORDING TO DATA SHEETS FOR 6DJ8’S ARE AS FOLLOWS: 90 PLATE VOLTS, MARGINAL GOOD 65%:21.4ma, LOW NOS 85%= 28ma, NOS 100%= 33ma. THIS PAIR MEASURES: 33, 33, 34, 34ma.THIS IS A REAL WORLD TEST OF THE TUBE. We tested itwith the same voltages it will see in a real application circuit. Most testerscannot put the proper plate voltages on a tube and cycle through stepped gridvoltages like we do with 576 CURVE TRACER.Some audiophiles know a good tube when they hear it. Whenever I put these tubes online there are a select few guys who snap up these gems. They have a terrific tone. The problem is that it is hard to find them in NOS condition. Most of the time they are below the levels that I feel comfortable with selling. I don't know why that is, and maybe it is just my perception. This pair however is AWESOME! They test at new levels and Tektronix !!!
Theymade the VERY best test equipment of all time in my opinion. These tubes are an embodiment of that fact. They sound great inmy headphone amp, and they will in yours!
On my tester a B&K 747 tester: Below55 = BAD 55-65= ? 65-100 = Good 100-120+= NOS
NOTES ON THE BOXES.LISTING WILL GENERALLY HAVE INFORMATION ABOUT ANY BOXES ASSOCIATED WITH THE TUBES FOR SALE. THESE ARE THE OPTIONS:1. NO BOXES PROVIDED (NONE AVAILABLE USUALLY USED AND SHOULD BE ASSUMED TO BE USED UNLESS OTHERWISE STATED.2. REPURPOSED BOXES. THESE ARE BOXES OF THE SAME MANUFACTURER. THESE WILL HAVE A LABEL OVER THE TUBE NUMBER THAT REFLECTS THE TUBE BEING SOLD. THESE TUBES SHOULD BE ASSUMED TO BE USED UNLESS OTHERWISE STATED.3. TUBEHUNTER BOXES. THESE ARE BOXES I HAVE MADE WITH GREAT TIME AND EXPENSE TO PROTECT YOUR VACUUM TUBES AND PROVIDE FOR STORAGE AND EASY IDENTIFICATION. TUBES IN THESE BOXES SHOULD BE ASSUMED TO BE USED UNLESS OTHERWISE STATED.4 WHITE BOXES. SHOULD BE SELF EXPLANATORY.
TESTING OF TUBES:THIS IS DONE ON A NUMBER OF TESTING DEVICES1. TEKTRONIX CURVE TRACER2. B&K 747 TUBE TESTER3. MERCURY 1000 DYNAMIC MUTUAL CONDUCTANCE TESTER
INTERPRETATION OF RESULTS:NOS = 80% TO 135%GOOD = 65% TO 80%? OR MARGINAL : 55% TO 65%BAD = 55%
TESTING RESULTS SHOW HOW THE TUBE IS PERFORMING NOW. TESTING RESULTS DO NOT SHOW HOW OLD A TUBE IS OR HOW MANY HOURS IT HAS BEEN USED. HOWEVER IF A TUBE TEST NOS YOU CAN BE ASSURED IT WILL LAST A LONG TIME AND IS WORKING VERY WELL.
I want to see you happy with your purchase. I will never sell a tube that is below standard…… I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way.I want your business now and in the future, so I assume you are the boss, and I am the employee.All tubes are tested for shorts, continuity, and emissions.I prefer PayPal.
ALL CUSTOMERS PLEASEREAD ALL NOTES BEFORE BUYING FROM ME !!1. RETURNS: It is my highest desire that you arecompletely satisfied with your purchase from me. I will bend over backwards tomake sure that you are a happy customer.If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described”button.Sound quality is tremendously SUBJECTIVE. For tubes returned for "noise" or "sound quality of any kind" you pay for the shipping we refund the purchase. We refund the price of the item NOT THE SHIPPING COST. If we sent the wrong tube we will of course pay for return shipping. For any tubes that are DOA we require that you send a us a picture of the shipping box to show us the damage. We test EVERY tube sent out and none should be DOA unless broken in shipping.2. PLEASE NOTE: Tube silkscreen(lettering on the tubes) is VERY fragile. It can be wiped off and destroyedVERY easily. If you wipe off the silkscreen while handling the tube youdiminish their value by up to 70%. DO NOT handle the tubes or hold them fromthe cylinder. ALWAYS hold them from the ENDS. If you are returning tubes andthey are not in the same condition cosmetically I cannot give you a fullrefund. THIS IS VERY IMPORTANT.3. UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOUPURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BEOPENED FOR AN UNPAID ITEM!!!4. TESTING: I test all tubes that I sell in one way or another, or I will state "untested". I have a B&K 747 tube tester. This is a mutual conductance tester. It give a percentage value of gm for the tube under test and checks for shorts and grid emissions. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. One evaluation is a screen shot of the tube with a high voltage applied to the plate. This helps the buyer see the linearity of the tube in question at the highest voltage the tube will see in a real circuit. The Curve tracer steps the triode through 10 gate/grid voltages starting with -10 volts and going to 0 volts. The lines show how the tube conducts throughout that range. At 0 volt the tube is at max conduction and is the top line on the display. It is easy at that point to take where that top line intersects the plate voltage, find the milliamp level and compare it to the datasheet. I give those numbers for you in the "Item condition box". To further help the buyer I also include the "Design values", for gm and ma readings in the table. This can then be compared to other tube sellers using inferior test methods such as Hickok, Amplitrex, and other testers. The Tektronix curve tracer gives values within 3% of the actual value. The very best portable testers only can approach 10% accuracy.5. Pleasenote: The numbers given for gm are what I see on my tester. I DO NOT guaranteethat you will see those numbers on your tester. I only guarantee that thesetubes will test good, with no shorts, or gas, on a decent calibrated tester. Idon't guarantee or imply anything else.6.VERY IMPORTANT!!! Vintage tube testers almost always, due to age, have VERY LOW HEATER VOLTAGES!!! Every tester I have ever bought is below 6 volts when selecting 6.3 volts.They average 5.8 volts. The voltage NEEDS to be 6.3 and 12.6. You can calibratea vintage tube tester all you want. If the heater voltage is not right, youwill NEVER get the right gm value. I have customers complain that their tubesare not the same as what I see on my tester. They say they have a calibratedtube tester. I have 40 tube testers. On all of them I have an outside regulatedDC power supply that feeds the tube tester the correct heater voltage.7. I don't check each and every tube for noise or tone. This is SUBJECTIVE and it is too time consuming. If you don't like the noise level or the tone we offer a hassle free refund policy.
Internationalcustomers note:1. Please wait forus to invoice you for the correct amount. If you have purchased more than oneitem, we must calculate how much the shipping will be. Shipping will be HIGHER due to insurance and shipping methods needed for expensive item totals. If you are buying only one item this will not be an issue. 2. Under nocircumstances will we state on a US customs a declared value of less than thesale price. This is an honesty issue. We are honest with everyone to the bestof our ability to do so. We want you to trust that what we say is true. Therecannot be that trust, if we make false statements knowingly to anyone. If yourcountry has tariffs/taxes so high that they cause large numbers of normallyhonest folks to make false statements, we urge you to work for change of thoselaws.3 International buyers if you bought more than one item andwant combined shipping it will ship in 2 days.4. And all the Angels sang because the heavenly music wasplaying and it was turned all the way up.
