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Hi,
I need to try some simulation in spice, so please can anyone tell me what value should I consider for the inductance on the primary in follows configurations ?
LL1674: 8:1, 4:1, 2:1
LL1676: 4:1, 2:1, 1:1
LL1690: 1:1
I asked to Lundhal but, this was the answer:
"We do not present inductance numbers for the transformers you have listed, as our opinion is that inductance is not a relevant concept for this type of transformers. Thus I am sorry we cannot provide the information you request."
I also sent this question to Kevin.
I hope for an answer...
Thanks.
Best regards.
Follow Ups:
I am sorry, but I don't have these data either. With few exceptions I have only the data provided in the Lundahl data sheets. I have little need for it as I am not a routine LT Spice user. My way of designing circuits involves much more interaction between my hearing apparatus and the tubes, transistors, transformers,etc., than simulating would allow. Some of my better sounding efforts have, for example, levels of THD that would cause the topology to be readily discarded as a failed simulation attempt. However, my ear/brain voted to keep the circuit and use it. I am not faulting anyone for using simulations to eliminate "dead ends" in design, but would urge caution in equating a good computer screen design with a circuit that actually conveys music in the way it can be heard live.
Kevin Carter
K&K Audio
www.kandkaudio.com
..
Builder of MagneQuest & Peerless transformers since 1989
Hi Kevin,
I understand what you say, but only a rough estimate, can you give me an idea of a value even an approximation? For example, we talk about 50H, 100H or 200H ?
Otherwise how do I figure out if the bass response is large enough?
Thanks anyway for your precious support.
Alberto.
The inductance is really high. I, too, think Lundahl's answer is kind of lame, but the reality is that the actual answer is likely complicated enough to cause more issues than it solves, and the inductance is so high that as a practical matter it does not matter. I have abused 1674's in all sorts of ways with all sorts of loads (including 1:8 with a 1M load), and I have never seen the bass roll off.
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