Most 'new' radios are designed to 'work' into a 50 ohm load.
http://www.icomamerica.com/en/products/amateur/hf/7300/specifications.aspx"
General
Frequency coverage
RX
TX
0.030–74.800**
1.800–1.999, 3.500–3.999, 5.255–5.405*, 7.000–7.300, 10.100–10.150, 14.000–14.350, 18.068–18.168, 21.000–21.450, 24.890–24.990, 28.000–29.700, 50.000–54.000
* Some frequency bands are not guaranteed.
** Guaranteed range: 0.500–29.999, 50.000–54.000MHz.
Mode SSB, CW, RTTY, AM, FM
Number of channels 101 (99 regular, 2 scan edges)
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Antenna connector SO-239 (50Ù) @@@@@@@@@@@@
Power supply requirement 13.8V DC ±15%
Power Consumption Tx: 21A (at 100W output power)
Rx: 0.9A typical (Standby), 1.25A (Maximum audio)
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I hope you're not asking, " If I had the radio tuner on, and tuned to a frequency, does the tuner default to the standard 50 ohm load if the tuner is tuned off?
My Icom stuff stays tuned to where it was when the tuner is turned off. But I don't know for sure what the 3000 does.
klc