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RE: Here's An Alternative - Better??

Well, yes, IMO. This is basically a 'long tailed pair', or a differential amplifier (cathode coupled) to my way of thinking. Notice that the plate resistors in this circuit have a much lower value (33K versus 100K) than in the other circuit - this will lower the output impedance, which is a good thing when driving a DHT. My problem with the paraphase splitter is that it's balance is highly dependent upon the mu of V5B. V5Bs gain must be precisely 11 in order to achieve balanced outputs (the ratio of it's input divider is R30/(R29+R30). Not to mention that the output of V5 will always be delayed in time relative to the output of V5A.

There was an excellent article about the relative merits of various phase splitter designs (I can't find it now), and it seems to me that the paraphase splitter was rated dead last.

By the way, a dissadvantage of the Eico LTP circuit is that it requires a 'pre driver' - the ECC83. Notice that the grids of the 6SN7 are DC coupled to the plate of the ECC83, and sit at +120 volts.


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