Description

E88CC Siemens, wonderful and very rare tight balanced, over 100% parameters. All tests indicate a NOS tube but we don't know full tube's history so we listed it as used. We tested in time many thousands of tubes and such tight balanced double triode appear very very rare when is full tested with high accuracy down to nanoA level. Of course, using only a gm tester many tubes seems to be balanced/matched but when same tubes are better tested there are huge differences between inside triodes. As datasheet, a not used E88CC parameters must be for nominal 100%, using test operating point 90V/-1.2V: plate current 15mA, gm 12.5mA/V. Below measured values, also seen in pics in test protocol: Plate current: 110/107% Gm: 107.5/108% Gain: 32.7/32.7 Rp: 2.68/2.7 kiloohm Ig (vacuum): less than 0,003 microA Ip variation when 1M2 series grid: 0.3% Leak HK at 100V: zero microA Heater current: 0.303A (nominal 0,3A). In Siemens boxe, not original one. Tested using Roetest professional tube testing system. Price is for 1 tubes in box, balanced as described, exact what is seen in photos, safe packaged in a box. Ask if more details are needed, we answer fast. Average shipping time is 5-10 days for Europe, 5-15 days for US and 10-15 days for China, Japan etc. We ship registered air mail with tracking number. Inventory: F48