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Saturntube wrote:

The difference soundwise in this half range 180hz and up horn module between the Leak TL12.1 amps and the First watt F5 clone was big,  mainly the tonal balance is very different with the midrange sounding thin.  Highs were more extended but a bit unnatural, they sound less liquid and more in your face, The midrange is not rude or scratchy but it is not full and round, it also lacks the attack on piano notes the Leak amps have.

Saturntube,

In context of your post a few things is needed to be to reviewed:

1)    What magnet types of your MF drivers and tweeter? It is my long observation that PP amps are very bad for driver with Alnico driver, they usually eat all details. The ceramic drivers however, that are ordinary are horrible for HF, are very nicely work with PP amps…

2)      What do you think, if you cone to use the First watt F5 and if you would be interested to recuperate some of the “midrange sounding thin” then would be able to do it with driving your upperbass with a slightly more open upper bound?

3)      The First Watt F5 is not truly the amp for consideration as it is not a single-ended amp.  Mr. Pass was progressive with his first amps - single-ended not feedback and then with his late model he become acting like a Moron who just read a lecture about conversion to vegetarianism and then stuffing himself with pepperoni on his elevator ride down to garage…

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