Description

Quantity One(1) TV7D/U TESTED Very Strong Gm & mA E88CC 6922 Tube May 1965 Siemans & Halske Munich, West Germany branded for RCA inked dated '65 24' Model 6922 E88CC (Premium ECC88 6DJ8) with Gold Pins, 10,000 Life Hours, Medium MU (Amplification factor 33/33) Twin Triode Tube. Glass is etched : ' A D 1 ‡ 5E' = May 1965. Where 'AD1' is tupe type ECC88 given in the Philips type code identification list dated from 1964. The ‡ double Dagger with the inked 'Made in Germany' denotes Siemans & Halske foundry in Munich, Germany. Tested : No Shorts, No Gas, No Leakage, No Apparent Micro-Phonics TEST RESULTS- Providence given in pics listed. Recommended minimum good is a TV7 meter reading of 50/50 = 6,250 uMhos Gm Vintage Average factory when new 100/100 = 12,500 uMhos Gm at 15.0/15.0 mA Plate current emissions Tube #1 : Red/Orange inked 'RCA' '65 24', White Inked '6922' 'Made in Germany' Plate#1 : 99.6 = 12,437.5 uMhos Transconductance(Gm) at 18.5 mA Plate Current emissions Plate#2 : 106.4 = 12,800.0 uMhos Transconductance(Gm) at 21.2 mA Plate Current emissions For reference: Typical Operating Characteristics (Class A1) Vintage Amperex PQ 6922 Factory data sheet, new tubes Transconductance(Gm) tests at TV7 meter reading of 100/100 (12,500 / 12,500 uMhos) at 15.0/15.0 mA Plate Current emissions ( +/- 10%) when tested at 100VDC Plate Supply volts. Minimum good TV7 meter reads 50=6,250 uMhos Transconductance( Gm ) per side which is 50% of factory average new. Factory Plate matching would pass QA if plates were <= 10% matched. -Tube will ship in a new RCA box as shown. -A printed copy of this detailed description with test results will be included in the box shipped, Our Test Bench : TV7D/U Restored, Enhanced & Upgraded( Digital Meter) by Dan Nelson Calibrated( 07/24/2023). Calibration re-verified on 01/06/2024 and again 06/03/2024. Condition/Providence : Pull from Analog High-End Professional Tektronix Oscilloscope. Cleaned the pins and dust off this tube and RE-Tested Very Strong, PLUG-IN and PLAY Condition. Published TV7 Settings (1962): 6922 Vf=6.3V EV7- 6080 Bias=21 Range =D Gm Button =3 Min. Good =50 Triode #1. 6922 Vf=6.3V EV2-1030 Bias=21 Range =D Gm Button =3 Min. Good =50 Triode #2. (notes: same settings as ECC88/6DJ8 except Bias=21 w/ Min Good=50=6,250 uMhos (Ecc88/6DJ8 bias=20 and min good = 62/62=7,750 uMhos) 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 Tracking. Ebay's international ship partners are USPS International, DHL & Asenda. Allow 10days to up to 6weeks 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.