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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: From AC coupling to DC coupling, is it that easy? posted by pufff on January 2, 2004 at 04:00:56:
Thanks.Here is another schmatic.
The movement of the balancing circuit to the input diff pair is a very good idea. In the setup I use now I have only around 4mA I can switch from side to side of the transformer. Now I get around 15mA, all according to spice. My output tubes keeps inside a 3mA margin, so I think they are good matched.I have changed the input stage a bit, actually I have now idea of the good operatings point for tubes, I have not tried to build that much. By fiddling around with the values I found out it's quite interactive.
Would a tube like 6C45pi be a better solution to the first stage? They should be very linear at low voltages I have read.
And 1.5 mA though each tube that works like a driver. Is that enough?CCS as a replacement for plate resistors. I have an idea, probably totally wrong, that it is better to pull the current down from the bottom of a tube instead of push it from the top. Here in Europe we use a type of saws that have to be pushed away from us. But when starting on the cut everybody pulls the saw gently towards our body to get a good starting point. In Japan they use pull saws, which means they always pull the saw towards themselves. The european saw has to be thick, but still bend a little when pushed. The japanese saw is very thin, and gets straighten out when pulled. (And sorry for my horrible english)
Still, what are the drawbacks of DC coupling?
Regards pufff
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Follow Ups
- One more new schmatic - pufff 01/3/0406:17:47 01/3/04 (2)
- Build it! - Allen Wright 06:25:32 01/6/04 (1)
- Re: Build it! - yuppiiiiii! - pufff 15:50:50 01/6/04 (0)
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