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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: Re: Morrisons "Siren Song" preamp posted by julioiglesias on November 28, 2000 at 15:26:50:
Hey, it has been a long day. I apologize for being short. I should have been more direct in answering your question. That's: The whole circuit is in the circuit and there really isn't a starting and stopping point with respect to the eq and the coupling network.Now, let's talk about this balanced thing. The input to the first stage in the Siren Song as shown in second SP is not balanced. You must have changed this following the first SP article. Easy enough by just putting the input across the grids of the two sections of the 6SL7 configured as a long-tailed pair. Between the 6SL7 and the 6SN7 you're balanced as well, the 6SN7 again being a long-tailed pair. From the output of the 6SN7 you are unbalanced into the 6N7.
One thing you could do is rewire the 6N7 like the first stage, another longtailed pair, applying the signal to the first grid and grounding the second grid, taking the output off the two plates into your transformer primary. Trouble is that the transformer would have to work with the plate resistance of the 6N7 which is I'm guessing 10k. Thus, if you have a 10k to 600 ohm transformer that might just get you there and you have lost gain in the step down ratio of this transformer. Doing the math in my head this is something like 16 to 1??? Check it it is late. This also matches you up for the balance input of your line stage. Not bad after a long day at law school huh?
Oh yea, a source for the tx...maybe jensen??
Now, I'm not necessarily suggesting this approach. You still will be off on the eq a bit since it is not parallel sections...but at least it is the same tube. I guess I really think you should leave the phono pre-amp alone.
Now, let's talk about the line stage. ECC82. 12AU7. I got some personal reservations about this tube; but, I'll keep those to myself since we are in public. Aside from that, a mu of 20. So no substitutions here....
Now I get to ask a question: Why the line stage? Why do you seem to insist one using it?
OK, I'll take two questions: Why the balanced? Audiophile dogma?
This is really the best thing going on the web right now...:> ))
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Follow Ups
- Re: Morrisons "Siren Song" preamp - L.D. Moore 11/28/0021:39:38 11/28/00 (0)
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