This matched set of four Telefunken E88CC-TK/6922 Black Diamond Series Vacuum Tubes is ideal for use in microphone preamplifiers and phono stages in homes, studios, and live stage applications. For personal enjoyment or commercial recording, they grant accurate imaging and versatile, expressive dynamics. Offering medium gain and low noise, these dual triode tubes deliver clean headroom and transparent tone critical to achieving sonically tight input stages. The E88CC-TK/6922 features gold-plated pins for enhanced signal integrity.
Newly manufactured and cryogenically treated to resurrect the transparent tone and harmonic impact of historical Siemens and Telefunken tubes
Great for microphone preamplifiers, phono stages, and sonically tight audio input sections
Also known as the 6922, the E88CC was originally targeted for test equipment and radar, but now serves audiophiles, musicians, and audio engineers
Designed to offer precise imaging, significant dynamics, and a full-bodied soundstage
Medium gain and low noise characteristics
Dual-triode like the 12AX7 tube, but with a different pin configuration (not a direct plug-in replacement)
Each tube is meticulously measured for all critical parameters of performance including transconductance, gain, noise, and microphonics
Tubes are selected by hand, rigorously tested, subjected to an extended burn-in period for stability, and re-measured before final packing
EAN: 899051002978
Telefunken MATCHED QUAD OF E88CC-TK (6922) Specs
Mechanical
| Type | R.F. dual triode |
| Base | Noval |
| Number of Pins | 9 |
Heater Requirements
| Voltage | 6.3 V |
| Current | 365 mA |
Direct Interelectrode Capacitances
| Capacitance | Grid to Cathode and Heater: 3.1 pF Plate to Cathode and Heater: 0.18 pF Grid to Plate: 1.4 pF |
Maximum Ratings
| Voltage | Plate Voltage: 550 V in cold conditions Plate Voltage: 400 V at 0 mA plate current Plate Voltage: 220 V Plate Voltage: 250 V at <0.8 W plate dissipation Grid Voltage: -100 V Cathode Positive to Heater Negative Voltage: 120 V Cathode Negative to Heater Positive Voltage: 60 V |
| Current | Cathode Current: 20 mA |
| Dissipation | Plate Dissipation: 1.5 W Grid Dissipation: 30 mW |
| Resistance | Cathode to Heater Resistance: 20 kOhms |
Typical Operation and Characteristics
| Voltage | Plate Voltage: 90 V Grid Voltage: -1.3 V |
| Current | Plate Current: 15 mA |
| Transconductance | 12.5 mA/V |
| Resistance | Internal Plate Resistance: 2.6 kOhms |
| Amplification | Amplification Factor: 33 µ |
Physical Characteristics
| Dimensions (H x Diam.) | 1.9 x 0.9" / 49.2 x 22.0 mm (excluding pins) 2.2 x 0.9" / 55.6 x 22.0 mm (including pins) |
| Weight | 0.3 oz / 8.5 g |
Packaging Info
| Package Weight | 0.2 lb |
| Box Dimensions (LxWxH) | 3.15 x 1.05 x 1" |
In the Box
- Telefunken E88CC-TK/6922 Black Diamond Series Vacuum Tubes (Matched Set of Four)
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