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Just because the radio has good receive audio does not necessarily mean the RX audio path is working perfectly. Keep in mind it only takes less than 1 watt of AF to make the speaker sound loud but it takes several watts of AF to fully modulate the transmitter. For example a Tram D-201 can have a flat 6L6 audio tube and still not show problems on RX but the TX audio will be down. To confirm full output you should use the scope to measure at least 5 volts peak AF into an 8 ohm load under full volume. The audio amp should be able to provide close to half of the total DC voltage applied as peak AF output.

[QUOTE="Shockwave, post: 651514, member: 10882"] Just because the radio has good receive audio does not necessarily mean the RX audio path is working perfectly. Keep in mind it only takes less than 1 watt of AF to make the speaker sound loud but it takes several watts of AF to fully modulate the transmitter. For example a Tram D-201 can have a flat 6L6 audio tube and still not show problems on RX but the TX audio will be down. To confirm full output you should use the scope to measure at least 5 volts peak AF into an 8 ohm load under full volume. The audio amp should be able to provide close to half of the total DC voltage applied as peak AF output. [/QUOTE]

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