I don't know shy this has not been mentioned but the 475M is the same as the 475A with some mechanical differences.
If you want to compare the 475M to the 475, use the 475A.
This is quoted from the 475M manual:
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About the 475M
The 475M is identical to the 475A Option 4 Oscilloscope
1. The accessory pouch on top of the 475A is not included as part of the 475M
2. To accomodate accessory storage, the 475M front cover is deeper than the 465A cover.
3. The 475M carry handle is longer
4. Instrument nomenclature is changet to 475M
5. The part number for the front panel (located on page 9-5, Fig. & Index No. 1-48) is changed to 333.2933-00
6. The Overall Dimension and Weight specification (Table 1-3, page 1-12) is changed as follows:
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Dimension and Weight table too complex to go into here.
I purchased a 475A at a local hamfest and Deane sent me the 475M manual saying it was the same. He was correct.
HTH
Bill
