The owner's manual should be able to tell you the type of tubes used. The tubes themselves are also probably labeled as well. Once the stock configuration is known, just let us at least know the type of tubes you already have, what type of music you play, and perhaps what you perceive is lacking in the sound that you are getting. Suggestions can then be made based on cost, and sound characteristics of variously branded NOS as well as currently (and plentiful) available types.
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