Matched Quad Of Tung - Sol 6550 KT88 Solid Gray Plate NOS - Testing Vacuum Tubes
Item History & Price
| Reference Number: Avaluer:7037705 | Country/Region of Manufacture: United States |
| Brand: Tung-Sol | Type: Power Tubes |
| UPC: Does not apply |
Excellent quad of used Tung-Sol 6550 solid gray plate tubes. Two are labeled for RCA but all four are of identical construction. Gm matched to about 5% difference, with a 6mA spread in plate current. These all test very strongly, at better than typical NOS levels.
Number6550Brand on tubeTung-Sol & RCAActual manufacturerTung-SolCountry of manufactureUSADate codes6339 x2 / PK3 x2Box typeWhite boxPlate styleSolid GrayGetter styleTop/Side-O x3Glass styleClear
Base styleOctalT...est results (measured , typical NOS)9500umhos @ 106mA
9250umhos @ 104mA
9000umhos @ 101mA
9000umhos @ 100mA
typical NOS is 5000Pleasesee my other listings for more tubes, and send me a message if youneed something that you don't see. I have a huge stock of many typesof tubes. I can also usually offer singles, pairs, quads, etc. of thetube(s) you see here.I’vebeen buying/collecting/selling vintage electronics for over 30 years, and have been an electronics engineer, Certified ElectronicsTechnician, amateur radio operator, and tube hoarder for much of mylife. I've been an eBay seller since February of 2000. This is theonly seller account I have on eBay and the pictures you see are ofthe actual tube(s) you’ll receive. Tubes are described, tested, andpresented to the best of my ability, subject to the limitations ofthe equipment that I have available (Hickok 539C and 6000A). Testresults are likely to differ some between your equipment and mine dueto the imprecise nature of 60-year-old consumer-grade test equipment.Unless otherwise stated in this listing, tubes are untested for noiseor microphonics.Questions?Offers? Do you have tubes to sell me (I do buytubes!)? Please contact me via the eBay messaging system or byother means.Ifyou have a problem with your order please send me a message and waitfor my reply. I will reply within 24 hours -- usually much sooner.Please do not open a case in the resolution center, as doing socompromises my seller rating and will be unnecessary for asatisfactory resolution.ReturnPolicyUnlessotherwise stated in this listing, tubes may be returned within 30days for a refund. Please keep in mind that while I do allow returns, my purpose here is to sell tubes, not to loan tubes for rolling. Anytube to be returned must:a) stillbear my identification stamp (see last paragraph in this section).b)be in exactlythe same condition in whichit arrived to you. This includes the electrical specs of the tube aswell as the condition of the box and the qualityof print on the tube.c) bephysically and electrically intact (not broken, cracked, or damagedfrom improper operation or handling).I payfor return shipping on all returns within the USA, regardless ofreason.You payfor return shipping if you are located outside of the USA. If thetube arrives to you DOA or significantly not as described (SNAD) Ipay for return shipping. I do not pay for return shipping for anyother reason. If a tube is returned as DOA or SNAD, but does not testas such upon return, I reserve the right to be reimbursed for anyreturn shipping cost that I paid.Myobligation is to you, the original buyer, while the tube is in yourpossession. That obligation ceases if you decide to resell the tube.Alltubes are stamped with an identifier to ensure that, in the event ofa return, I get the tubes back that I originally sold. The stamp isvery similar to the chalky paint that tube manufacturers used, and assuch, it is removable if rubbed with sufficient force. Be careful notto rub the stamp off until the tube meets your satisfaction.ShippingDOMESTIC:Unlessotherwise noted, free USPS shipping is offered on all tubes purchasedwith Buy-It-Now. Orders that weigh 16 oz. or less are generallyshipped via the USPS First Class Package service, and orders weighingover that amount are shipped via USPS Priority Mail service. Otherservices are available at additional cost. If you prefer a shippingmethod that is not listed, please let me know prior to payment. I canship via any USPS or UPS method that is applicable to your ZIP code.INTERNATIONAL:USPSFirst Class Mail: This is theleast expensive option but it is not insurable and the availabilityof tracking is limited in many cases. It's available worldwide forpackages with a value of USD$50 or less. It's also available toselect countries for packages with a value of USD$100 or less. It'savailable to Canada for packages with a value of USD$200 or less. Ifyour country doesn't qualify under these guidelines and you wouldstill like to ship via First Class Mail, please contact me and Imight be able to make an exception. Be aware that FirstClass Mail has been known to take up to threemonths to reach somedestinations. Customs delays are also more common with First Class.If you select the First Class option I expect that you will bepatient and wait three months before requesting a refund for “itemnot received.”USPSPriority Mail: This option isavailable worldwide for packages with a value of $1000 or less. It isfully insurable and trackable.USPSPriority Mail Express: Thisoption is mandatory for packages with a value greater than $1000. Itallows for expanded insurance options and is usually faster intransit by several days.Ordersvalued in excess of $2000 may be shipped in multiple packages.USPS isthe only shipping carrier I use for international shipments. I do notuse eBay's Global Shipping Program (GSP). I mustdeclare the actual value of the item on customs forms. This ensuresthat I abide by the laws of your country and the terms of myinsurance. I cannot declare a lower value.Customs fees and import taxes/duties are the responsibility of thebuyer.GENERAL:COMBINEDSHIPPING: I'm happy to combine shipping on multiple purchases.Those shipping within the US will combine automatically.International orders must be manually combined after the purchase, and any excess shipping will be refunded to your payment source (dueto the way eBay buy-it-now items are set up, this is the only I cancombine shipping on more than one item).HANDLINGTIME: My handling time is one business day and eBay requiresme to ship within that timeframe. I cannot withhold shipment for alater date. If you require shipment on a specific date I can oftenset up a special listing just for you on that date; please inquire.Ordersplaced Monday through Friday usually ship same day.Ordersplaced later in the day Monday through Friday often ship next day.Ordersplaced later in the day on Friday mightshipon Saturday but could possibly be shipped Monday.Ordersplaced early enough on Saturday might ship the same day;otherwise they ship on Monday.Ordersplaced on Sunday ship on Monday.Ordersplaced on a USPS-observed holiday ship the following business day.SIGNATURERELEASE: Ebay requires me to obtain a signature release forall orders valued at USD$750 or greater. At your request I can alsorestrict delivery and/or obtain a signature release for most packagesfor an extra fee; please inquire for details.SHIP-TOADDRESS: Ebay requires that I ship to the address on theorder. This protects both you and me. I cannot ship to a differentaddress. If you require shipment to a different address please updateyour shipping information before making a purchase.
Number6550Brand on tubeTung-Sol & RCAActual manufacturerTung-SolCountry of manufactureUSADate codes6339 x2 / PK3 x2Box typeWhite boxPlate styleSolid GrayGetter styleTop/Side-O x3Glass styleClear
Base styleOctalT...est results (measured , typical NOS)9500umhos @ 106mA
9250umhos @ 104mA
9000umhos @ 101mA
9000umhos @ 100mA
typical NOS is 5000Pleasesee my other listings for more tubes, and send me a message if youneed something that you don't see. I have a huge stock of many typesof tubes. I can also usually offer singles, pairs, quads, etc. of thetube(s) you see here.I’vebeen buying/collecting/selling vintage electronics for over 30 years, and have been an electronics engineer, Certified ElectronicsTechnician, amateur radio operator, and tube hoarder for much of mylife. I've been an eBay seller since February of 2000. This is theonly seller account I have on eBay and the pictures you see are ofthe actual tube(s) you’ll receive. Tubes are described, tested, andpresented to the best of my ability, subject to the limitations ofthe equipment that I have available (Hickok 539C and 6000A). Testresults are likely to differ some between your equipment and mine dueto the imprecise nature of 60-year-old consumer-grade test equipment.Unless otherwise stated in this listing, tubes are untested for noiseor microphonics.Questions?Offers? Do you have tubes to sell me (I do buytubes!)? Please contact me via the eBay messaging system or byother means.Ifyou have a problem with your order please send me a message and waitfor my reply. I will reply within 24 hours -- usually much sooner.Please do not open a case in the resolution center, as doing socompromises my seller rating and will be unnecessary for asatisfactory resolution.ReturnPolicyUnlessotherwise stated in this listing, tubes may be returned within 30days for a refund. Please keep in mind that while I do allow returns, my purpose here is to sell tubes, not to loan tubes for rolling. Anytube to be returned must:a) stillbear my identification stamp (see last paragraph in this section).b)be in exactlythe same condition in whichit arrived to you. This includes the electrical specs of the tube aswell as the condition of the box and the qualityof print on the tube.c) bephysically and electrically intact (not broken, cracked, or damagedfrom improper operation or handling).I payfor return shipping on all returns within the USA, regardless ofreason.You payfor return shipping if you are located outside of the USA. If thetube arrives to you DOA or significantly not as described (SNAD) Ipay for return shipping. I do not pay for return shipping for anyother reason. If a tube is returned as DOA or SNAD, but does not testas such upon return, I reserve the right to be reimbursed for anyreturn shipping cost that I paid.Myobligation is to you, the original buyer, while the tube is in yourpossession. That obligation ceases if you decide to resell the tube.Alltubes are stamped with an identifier to ensure that, in the event ofa return, I get the tubes back that I originally sold. The stamp isvery similar to the chalky paint that tube manufacturers used, and assuch, it is removable if rubbed with sufficient force. Be careful notto rub the stamp off until the tube meets your satisfaction.ShippingDOMESTIC:Unlessotherwise noted, free USPS shipping is offered on all tubes purchasedwith Buy-It-Now. Orders that weigh 16 oz. or less are generallyshipped via the USPS First Class Package service, and orders weighingover that amount are shipped via USPS Priority Mail service. Otherservices are available at additional cost. If you prefer a shippingmethod that is not listed, please let me know prior to payment. I canship via any USPS or UPS method that is applicable to your ZIP code.INTERNATIONAL:USPSFirst Class Mail: This is theleast expensive option but it is not insurable and the availabilityof tracking is limited in many cases. It's available worldwide forpackages with a value of USD$50 or less. It's also available toselect countries for packages with a value of USD$100 or less. It'savailable to Canada for packages with a value of USD$200 or less. Ifyour country doesn't qualify under these guidelines and you wouldstill like to ship via First Class Mail, please contact me and Imight be able to make an exception. Be aware that FirstClass Mail has been known to take up to threemonths to reach somedestinations. Customs delays are also more common with First Class.If you select the First Class option I expect that you will bepatient and wait three months before requesting a refund for “itemnot received.”USPSPriority Mail: This option isavailable worldwide for packages with a value of $1000 or less. It isfully insurable and trackable.USPSPriority Mail Express: Thisoption is mandatory for packages with a value greater than $1000. Itallows for expanded insurance options and is usually faster intransit by several days.Ordersvalued in excess of $2000 may be shipped in multiple packages.USPS isthe only shipping carrier I use for international shipments. I do notuse eBay's Global Shipping Program (GSP). I mustdeclare the actual value of the item on customs forms. This ensuresthat I abide by the laws of your country and the terms of myinsurance. I cannot declare a lower value.Customs fees and import taxes/duties are the responsibility of thebuyer.GENERAL:COMBINEDSHIPPING: I'm happy to combine shipping on multiple purchases.Those shipping within the US will combine automatically.International orders must be manually combined after the purchase, and any excess shipping will be refunded to your payment source (dueto the way eBay buy-it-now items are set up, this is the only I cancombine shipping on more than one item).HANDLINGTIME: My handling time is one business day and eBay requiresme to ship within that timeframe. I cannot withhold shipment for alater date. If you require shipment on a specific date I can oftenset up a special listing just for you on that date; please inquire.Ordersplaced Monday through Friday usually ship same day.Ordersplaced later in the day Monday through Friday often ship next day.Ordersplaced later in the day on Friday mightshipon Saturday but could possibly be shipped Monday.Ordersplaced early enough on Saturday might ship the same day;otherwise they ship on Monday.Ordersplaced on Sunday ship on Monday.Ordersplaced on a USPS-observed holiday ship the following business day.SIGNATURERELEASE: Ebay requires me to obtain a signature release forall orders valued at USD$750 or greater. At your request I can alsorestrict delivery and/or obtain a signature release for most packagesfor an extra fee; please inquire for details.SHIP-TOADDRESS: Ebay requires that I ship to the address on theorder. This protects both you and me. I cannot ship to a differentaddress. If you require shipment to a different address please updateyour shipping information before making a purchase.
