Question about Amplifiers & Preamps
Guitar amplifier; late 60's possibly; need schematic for componet values
If you are in the power supply, are you sure that one is used? 4xx series are power supply designations. Maybe numbers got transposed?
2 ways to approach it.
I am looking at an SUZ22 and an SUZ55, the power supplies are roughly the same. The closest component is R416 which is a 39 Ohm resistor. This supplies power to the flourescent display in a current limitng mode.
The alternate approach is where is it in the circuit? what is "downstream of it"?
If it was a larger 1 Watt or 2 Watt Try 1500 Ohms.
If it is the flourescent display, 39 ohms is most probable for manufacturer inventory purposes. If LCD, try 390.
If the preamp is downstream, it is not going to require a great deal of power, and you may be able to trace a parallel trace off the other channel to a corresponding resistor. If that has been tried and it just traces back to the same point, Try 1500 Ohms.
Also, there is symetry in the amplifier because it uses a split supply Vcc- and Vcc+ Not to mentione the symetry between right and left channels.
Posted on Jul 05, 2012
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