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Old 23rd February 2013, 02:36 PM   #1541
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no, I use the second version of the schematic above with 6sl7 as amplifier stage and 6sn7 as buffer, with a separate casing psu
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Old 23rd February 2013, 02:40 PM   #1542
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with 6SL7 you're having way too much gain

not exactly most clever solution , looking from signal leveling point of view - too much attenuating and then too much amplifying

with funny J , all you need is gain of 2-3x , at least I prefer stages like that to purely passive

I also like iterations with just proper buffering , so no gain at all
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Old 23rd February 2013, 02:43 PM   #1543
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you are sayng about pot which lowers the signal and then 1st stage which is amplifing too much?
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Old 23rd February 2013, 02:45 PM   #1544
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Vfet pre.
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Old 23rd February 2013, 02:45 PM   #1545
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@ Schultzch - yes , exactly

buzz - you have any possible part candidate for that pre ?

anyway - why using part with questionable triodish characteristics not easily available, when you have part which is exactly triodishly triode itself , easily available ?
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Old 23rd February 2013, 02:50 PM   #1546
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Yes
Being difficult?
I actually use beautiful triode 6v6. Waiting for, not really, SUsy 6V6, althought that just might counteract loveliness of triode.
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Old 23rd February 2013, 02:57 PM   #1547
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as source signal I use an experimental board with pcm1794 and 100R i/v resistors (signal taken single ended) as for this the gain it fits pretty well at this moment.
after I finish with the amps I would like to do a dual mono pcm1794dac and active i/v .. any recommandation for i/v?
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Old 23rd February 2013, 02:59 PM   #1548
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D1 or maybe Xformer feeding OPA1632 directly into AJ balanced input.
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Old 23rd February 2013, 03:04 PM   #1549
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Quote:
Originally Posted by buzzforb View Post
Yes
Being difficult?
I actually use beautiful triode 6v6. Waiting for, not really, SUsy 6V6, althought that just might counteract loveliness of triode.
send me exact schematic you're using now , and I'll give you what you want

you know that it will be bal in bal out , and that will inevitably kill some of second harmonic sweetness

you can gain some of it back , but not entirely

it will help if you give me voltages here and there ( and gain figure , too ), to save me too much looking at graphs

then say what gain figure you want

those things are easypeasy ; what is not easypeasy is when you want DC coupling all the way
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Old 23rd February 2013, 03:07 PM   #1550
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Quote:
Originally Posted by buzzforb View Post
....Xformer feeding OPA1632 directly into AJ balanced input.
yes

hard to beat
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