In Reply to: Here's An Alternative - Better?? posted by FlaCharlie on August 1, 2007 at 09:24:13:
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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Follow Ups
- RE: Here's An Alternative - Better?? - mikeyb 08/1/0710:18:15 08/1/07 (36)
- Two Questions - FlaCharlie 10:54:57 08/1/07 (7)
- RE: Two Questions - mikeyb 13:16:09 08/1/07 (6)
- OK . . . So . . . Working Through This . . . - FlaCharlie 14:34:54 08/1/07 (5)
- What About the Gain Issue? - FlaCharlie 19:07:30 08/1/07 (1)
- Try looking here - Russ57 07:55:47 08/2/07 (0)
- RE: OK . . . So . . . Working Through This . . . - mikeyb 18:48:13 08/1/07 (2)
- Why Would a Negative Supply Be Necessary? - FlaCharlie 18:31:42 08/2/07 (1)
- RE: Why Would a Negative Supply Be Necessary? - mikeyb 05:45:02 08/3/07 (0)
- RE: Here's An Alternative - Better?? - dave slagle 10:39:20 08/1/07 (27)
- RE: Here's An Alternative - Better?? - mikeyb 13:04:47 08/1/07 (26)
- RE: Here's An Alternative - Better?? - Dave Cigna 14:07:14 08/1/07 (25)
- RE: not buying it - Ralph 13:10:55 08/2/07 (24)
- RE: not buying it - Dave Cigna 14:05:32 08/2/07 (23)
- RE: still not buying it - Ralph 14:31:26 08/2/07 (22)
- I'll try to explain it as well as I can. - Dave Cigna 16:25:00 08/2/07 (21)
- RE: I missed the ground connection - Ralph 10:12:44 08/3/07 (20)
- RE: I missed the ground connection - Dave Cigna 12:56:29 08/3/07 (19)
- RE: Funny though, I knew there was something wrong with your argument - Ralph 14:26:56 08/3/07 (18)
- That's interesting - Dave Cigna 06:02:54 08/4/07 (17)
- Thanks to Everyone . . . And Another Question or Two - FlaCharlie 12:17:12 08/4/07 (2)
- RE: Thanks to Everyone . . . And Another Question or Two - Ralph 16:57:50 08/5/07 (0)
- RE: Thanks to Everyone . . . And Another Question or Two - Dave Cigna 15:55:47 08/5/07 (0)
- another thought - Dave Cigna 11:13:52 08/4/07 (13)
- RE: another thought - Ralph 16:40:04 08/5/07 (12)
- RE: another thought - Dave Cigna 08:50:37 08/6/07 (11)
- RE: crow 10:1 - Ralph 10:57:16 08/6/07 (10)
- RE: crow 10:1 - Dave Cigna 08:17:46 08/8/07 (0)
- Will The Paraphase Need Feedback? - FlaCharlie 12:10:36 08/6/07 (2)
- Pete's circuit - Russ57 14:27:19 08/6/07 (0)
- RE: Will The Paraphase Need Feedback? - Ralph 13:29:24 08/6/07 (0)
- differential driver is the more elegant - Russ57 11:59:53 08/6/07 (5)
- RE: differential driver is the more elegant - Dave Cigna 08:39:10 08/8/07 (2)
- Spice scares me....maybe too many dune novels...LOL - Russ57 16:18:53 08/8/07 (1)
- RE: Spice scares me....maybe too many dune novels...LOL - dave slagle 19:29:45 08/8/07 (0)
- Is It Possible? - FlaCharlie 10:34:11 08/7/07 (1)
- RE: Is It Possible? - Dave Cigna 09:03:19 08/8/07 (0)