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Tube hiss .and/or alignment?

I have a newly purchased FM-3 that has noticeable and varying hiss compared to my best FM-3 (using same antenna feed, amp, etc).

Would this be tube hiss? There is no hum, just a variable volume hiss that is more noticeable with increase in playback volume, although only noticeable at all during quieter music passages. And only on weaker station, although my better FM-3 has no hiss on same station.

Tube hiss or just alignment? Which tubes would be the likely culprit(s) in an FM-3.

I have read that an alighnment is always recommended for most tube changes in an FM-3, so thre is that complication.

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Topic - Tube hiss .and/or alignment? - ltman 11:45:28 03/11/24 (3)


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