Would like to convert a component AM/FM Tuner to batteries.

Was told about the Sony Tuners with System Control that are DC only
and found a ST-JX 235 but not the integrated amp that has the AC power
supply.

Does anyone know if there is a free schematic avail for this tuner on
the internet?

Did a quick search using Sony HCD-551 and SA-W551 but only found Sony
Original Service Manual HCD551 / HCD-551 http://www.qservice.tv/VPASP/shopexd.asp?id=5249
for $14.99

All I want is the DC Voltage for the Tuner so not to destroy anything.

When opened the tuner and inspected the System Control connector and
attached small PC board noticed that it was marked N9V.

Does this mean that the Voltage to the Tuner is 9V?

Am open to any suggestions or tips.

Thanks

Ken