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Old 12th October 2012, 08:27 AM   #361
juma is online now juma  Serbia
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Quote:
Originally Posted by tinitus View Post
... like using two 2sk170 instead of the complementary pair...
What schematic (link, post nr.) ?


Quote:
Originally Posted by tinitus View Post
...would the trick work for combining j310 with BS170 ?
What trick ? Why/where combine J310 & BS170 ?

Sorry Tinitus, i can't see inside your head, please reference your ideas with links/post numbers...
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Old 12th October 2012, 09:04 AM   #362
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yeah, I get my silly ideas

well, like you said, maybe I better stick to the jboz, maybe with j310

my idea with j310 with BS170 ?
I might get burned forever for this
it would be like a bastard all N channel version of BA3 frontend

you have permission to shoot me now
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Old 12th October 2012, 11:03 AM   #363
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No need to shoot ... yet
BA3 is complementary, symmetrical, push-pull circuit. It' cannot be done with N ch. devices only. Same sex transistors allow for quasi-complementary, circlotron or single-ended arrangements, and neither of those can qualify for BA3
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Old 12th October 2012, 11:06 AM   #364
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OK, its already complicated enough

with the j310 being a tougher one, maybe a symmetric output buffer would be a better idea ?

but Im in doubt about all the resistors around the att pots
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Old 12th October 2012, 11:13 AM   #365
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1. What do you mean when you say: "with the j310 being a tougher one" ?

2. First you want all N ch. devices (and the buffer is a great place to do it) but now you want complementary pair, push-pull buffer ? It makes sense only if you want to drive the next stage which has 1k-3k of Zin...
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Old 12th October 2012, 11:29 AM   #366
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....... maybe a symmetric output buffer ....... ?
shoot, forgot I think you said j310 cannot replace a sk170, directly

any ideas ?
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Old 12th October 2012, 11:35 AM   #367
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1. What do you mean when you say: "with the j310 being a tougher one" ?

......makes sense only if you want to drive the next stage which has 1k-3k of Zin...
dont know
I think you said 5v out, and isnt that more than sk170 ?

power amp load ?
could be 100k one day, and 10k the next day
I dont know
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Old 12th October 2012, 11:56 AM   #368
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I think you said 5v out, and isnt that more than sk170
Right, it will produce more undistorted voltage swing in the same topological form due to differrent construction (long gate vs short gate JFET), lower gm (lower gain being the price to be paid).
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Old 12th October 2012, 12:01 PM   #369
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shoot, forgot I think you said j310 cannot replace a sk170, directly

any ideas ?
Not directly - they belong to different construction groups.
If you want complementary buffer with J310 first you have to find a P ch. complement for it.
And if you want a single ended buffer with J310 (like B1) you'll have to put up with Zout of few hundreds Ohms or to use coupling cap.
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Old 12th October 2012, 12:46 PM   #370
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And if you want a single ended buffer with J310 (like B1) you'll have to put up with Zout of few hundreds Ohms or to use coupling cap.
sounds good to me, and what I had in mind, eventually

introducing the j310 kind of changed the picture, with its lower gain, and no buffers needed, apart from maybe the output
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