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Technical bulletin #4SUBJECT: Preamplifier Tubes - Type 6DJ8, ECC88, 6922, 7308AUDIBLE ILLUSIONS PREAMPLIFIER TUBES are operated within design limits specified by the tube manufacturer. *SOURCE: SYLVANIA TECHNICAL MANUAL-RECEIVING TUBES 1979 |
| MANUFACTURERS SUGGESTED | MAXIMUM | MODULUS 3A | ||
| HEATER-FILAMENT VOLTAGE | 6.3 vdc | 6.2 vdc | (1) | |
| PLATE (Supply) | 550 vdc | 250 vdc | (2) | |
| PLATE (Plate) | 130 vdc | 60 vdc | (Phono Sec.1) | (3) |
| 120 vcc | (Phono Sec.2) | (4) | ||
| PLATE (Plate) | 130 vdc | 125 vdc | (Line Stage) | (5) |
| PLATE CURRENT (Supply) | 15 mA | 10.3 mA | (Line
Stage) (Triode Pair) |
(6) |
| PLATE DISSIPATION | 1.8 watts | .04w | (Phono Sec.1) | (7) |
| .6w | (Phono Sec.2) | (8) | ||
| 1.29w | (Line
Stage) (Triode Pair) |
(9) |
| (1) | Measurement taken at each tube |
| (2) | Measurement taken at output of regulated power supply |
| (3) | Measurement taken at 1st stage plate resistor |
| (4) | Measurement taken at 2nd stage plate resistor |
| (5) | Measurement taken at plate resistor |
| (6) | Measurement taken at cathode resistor |
| (7) | Measurement taken at 1st stage plate resistor |
| (8) | Measurement taken at 2nd stage plate resistor |
| (9) | Measurement taken at cathode resistor |
| *Note: Audible Illusions currently uses a Russian manufacture 6922 dual triode tube. The voltage-current maximum rating for this tube is somewhat higher than 6DJ8, ECC88 or 7308 tubes. |
