If you can buy any old Fender tube amp, just about any experienced amp tech can turn it in to just about any member of it's original family without too much in the way of component costs. At this point I have to point out that any and all of these are just 'opinions'.and you know what they say about that?!!!!! I think the main consideration here is price. Yet, others have found it to have some significant advantages as well. Fender also added the 'Master Volume' control set up on some models, which a lot of people claim as being a horrible change in design. Both systems have their advantages and disadvantages. However, if one wanted to either raise or lower the bias level, you had to actually go in and change a resistor value.
So, if a matched set of output tubes was not available, the 'matching' of the bias level for both tubes could be achieved by the simple twist of the pot.
Rather, it used a pot to 'balance' the bias supply feed across the output tubes such that a bias 'imbalance' in the tubes themselves could be compensated for by adjusting the supply feed to either side. Later silver face amps went to a 'bias-balance' set up which did not have an 'adjustable' bias in the typical manner of simply twisting a potentiometer to increase or decrease bias. Depending on which silver face amp one might be working with, some (ie '68 versions) are essentially identical to the prior black face versions.
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