A large manudacturer makes amplifier 'X' that has an appeal to a finite number of folks who buy them. After the initial sales period the demand is reduced to a trickle, so the manufacturer has two options, 1)Bring out something 'new' or 2)Bring out a revision/upgrade/improved version.
When a company has produced an outstanding design it will often offer improved versions relying of the rep of the original version to encourage sales. When the company has produced an ordinary product it will come out with a 'new' design and rely on sales from its overall rep for producing interesting products.
Cyclonicman is right - this all makes little difference so long as the manufacturer remains in business and is will ing to service their stuff (and you do due dillegence re the products actual performance before you buy).
FWIW.
When a company has produced an outstanding design it will often offer improved versions relying of the rep of the original version to encourage sales. When the company has produced an ordinary product it will come out with a 'new' design and rely on sales from its overall rep for producing interesting products.
Cyclonicman is right - this all makes little difference so long as the manufacturer remains in business and is will ing to service their stuff (and you do due dillegence re the products actual performance before you buy).
FWIW.