Genuine West German Telefunken E188CC (7308) with the ◇ diamond etched into the stem bottom and gold pins - NOS or very little used, both sections testing well above minimum. The long-life premium frame-grid triode that audio builders chase.
Uh = 6.3V | Ua = 90V | Ug1 = -1.3V
| Section | Ia (mA) | S (mA/V) | Minimum |
|---|---|---|---|
| T1 | 14.5 | 10.1 | Ia: 8.5 mA |
| T2 | 11.6 | 10.7 |
E188CC = 7308 = CV4108
Pin-compatible premium relative of the E88CC / 6922 family - the E188CC is a distinct higher-specification long-life type, not simply a rebadged E88CC.
The E188CC (7308) is a frame-grid double triode introduced in 1959 as a special-quality, long-life member of the E88CC family, built to tighter tolerances for professional and instrumentation use. Its high transconductance, low noise, and rated 10,000-hour service life made it a standard in measurement equipment, military gear, and broadcast electronics, and the same qualities later made it one of the most sought-after small-signal triodes in high-end audio. Telefunken's West German production is the most prized source for this type: the confirmed Rautenboden diamond and gold pins mark it as genuine domestic manufacture of the highest grade.
A genuine Telefunken diamond E188CC in NOS condition - the gold-pin tube your preamp deserves. These don't sit around for long.
SKU: 559