S E T T I N G U P
The Amp 1 comes with seven (7) tubes, as follows:
12AX7 (V2) FIRST STAGE AMPLIFICATION TUBE
The first stage of amplification in the amplifier section of the Amp 1 is achieved through the use of this dual triode, amplifying both channels, one per triode section. The 12AX7 may be replaced with the ECC83 or 7025A tube.
12AU7 (V1 & V3) DRIVER TUBES
These tubes split the phase of the signal and drive the push/pull pairs of power tubes. The 12AU7 tubes may be replaced with ECC82, E82CC, ECC802S, 5814A, 6189, CV4003 or M8136. 12BH7A tubes may also be used with a slight increase in performance.
EL34 (V4,V5,V6,V7) POWER TUBES
These tubes provide the last stage of amplification, set up in push/pull pairs (2 tubes per channel). The output stage uses an adjustable fixed biasing scheme which has been carefully adjusted at the factory to match the characteris-
tics of the output tubes shipped with this unit. The Bias adjustments should remain reasonably stable over the life of the output tubes and should not require periodic adjust- ment until the EL34 tubes are replaced.
Should one of the EL34 tubes fail, it may be replaced indi- vidually, as separate bias adjustments allow optimizing the operating conditions for each tube. For best performance, tubes in the pair V4 and V5 or V6 and V7, should be replaced with a matched pair. EL34 output tubes are inter- changeable with and may be replaced by 6CA7, E34L, and KT77. Other tube substitutions are not recommended.
WARNING: Tube replacement and bias adjustment involves working with the covers off and power applied, around hazardous and potentially lethal voltages, and should be performed only by quali- fied personnel with the proper equipment and training.
Left Channel | Right Channel | Right Channel | Right Channel | AC Power Inlet |
Output Binding Posts | RCA Input (SE) | RCA Input (SE) | Output Binding Posts | Fuse Holder |
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Left Channel | Right Channel | Power |
Output Transformer | Output Transformer | Transformer |
Biasing Controls | Biasing Controls |
ON/OFF
Power Switch
4
