Description

Quantity Six(6) Vintage Date Matched TV7D/U Tested Strong 1961 Tung-Sol for Motorola 6V6GTA Tubes FULL TEST RESULTS GIVEN BELOW and In Pics listed (SEE ALL PICS Posted) You will receive a printed copy of this detailed description with full test results in the well packaged box shipped. Each tube is marked 1 through 6 on the glass side in removable black 'Sharpie' ink to correspond to the test results below. With the test results you can match up very closely matched atleast 2 Pairs( 4 of 6) [or one Quad(4) of 4 tubes] with the other 2 tubes as strong spares. Dan Nelson Calibrated TV7D/U Tested, Tubes Date Matched from 1961 Lot of Six(6) 6V6GTA Tubes TUNG-SOL for Motorola for vintage tweed, brown, white tolex or blackface Fender Amps or other Musical instrument amplifiers. Physical Characteristic's: - Thoriated Tungsten Black Plates - Thick Copper Rods, Two Spiked Wafer/Spacers - Large Top-side Ring/Halo Getter - Tube tops with Silver Flashing on glass - Black Phenolic base - Red/Orange inked '3221-28-3' 'L600' "Made in USA" "Motorola" - '3221-28-3' 'L600' = Tung-Sol EIA code = '322', '1'=1961, '-28'=28th week(July) '-3'=Plant Newark NJ, 'L600'=Internal QA team/Contract# for Motorola Condition: TV7D/U tested, 2x Lightly Used + 4x At and Above Factory Specs, No Boxes but shipped well packaged and in Plug-in and Play condition, We Cleaned & Sprayed Pins, Clean Glass and Locator Guide. - References: from Tung-Sol Factory Data Sheets when TV7 tested at 150VDC Plate supply a factory average testing tube will test at a TV7 meter Reading of 74 = 3,700 uMhos Transconductance(Gm) at 29.0mA Plate current Emissions. TV7 Suggested Minimum, good 46=2,300 uMhos(Gm) Notes: 'Bogey' = from Data Sheets by TUNG-SOL RCA GE SYLVANIA factory Specs when new for a 6V6GT or GTA depends upon the Plate Supply Volts applied to the tube under test. Spec Key: Plate Supply Voltage for Tube under Test 150V 250V 315V(max.) Transconductance(Gm): 3,700(74) 4,100(82) 3,750(75) Emissions(mA): 29.0 45.0 35.0 - Calibrated TV7D/U tested at 150VDC Plate Supply Volts - Tubes 2&6 are very closely matched as are Tubes 3&4 - Notes : mA Plate Current emissions is the most important factor when matching up power tubes and Transconductance(Gm) is a secondary consideration. Tube inked 2: Gm= 73.2/46 = 3,660.0 uMhos at 31.2mA Plate Current Emissions Tube inked 3: Gm= 74.5/46 = 3,750.0 uMhos at 29.8mA Plate Current Emissions Tube inked 4: Gm= 74.7/46 = 3,735.0 uMhos at 30.6mA Plate Current Emissions Tube inked 6: Gm= 75.8/46 = 3,790.0 uMhos at 31.1mA Plate Current Emissions (+2 spares) Tube inked 1: Gm= 63.6/46 = 3,180.0 uMhos at 25.8mA Plate Current Emissions Tube inked 5: Gm= 70.4/46 = 3,520.0 uMhos at 27.4mA Plate Current Emissions Our Test Bench : TV7D/U Restored, Enhanced & Upgraded( Digital Meter and solid state bridge) Dan Nelson Calibrated( 07/24/2023). Calibration re-verified on 01/06/2024 & on 6/03/2024. Our TV7D/U reads Transconductance(Gm) on a scale of 0-120 (push button #3, for rectifiers button #7). This TV7D/U will read mA plate current emissions directly by depressing Gm button and the red button on the digital meter, We use the last published xls spreadsheet by Nolan Lee to transpose actual TV7 digital meter readings 0-120 into actual Transconductance(Gm) #'s in uMhos based upon the selector switch setting A-F. All versions of TV7's and most Hickok designed tube testers will test tubes at a maximum of 150V Plate Volts and Grid #2 at 130V volts and Control Grid #1 (Bias control) at ranges from 0 to -30Volts. WE PACK VERY WELL AND SHIP FAST TO OVER 100 COUNTRIES WORLDWIDE MANY Years of Experience shipping fragile electronics, speakers and Vacuum Tubes. US Shipping to All 50 States & US Territories + APO/DPO/FPO/ xPO & PO Boxes International via eBay International Shipping Center - low cost space available Air-Freight with full Tracking, Insured Guaranteed Delivery. eBay's international ship partners are USPS International, DHL & Asendia. Allow 10-days to up to 6-weeks for delivery depending upon country of destination. IF YOUR COUNTRY IS LISTED IN THE DROP DOWN BOX IN THE 'SHIPPING, HANDELING' TAB THEN WE SHIP TO YOU. Thank you for looking!