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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: I've used the LL1654 gapped for 30mA. posted by JLH on August 29, 2003 at 16:24:06:
John's post reveals one of the essential differences in practice between these two transformers. The LL1654 is a five section transformer, while the LL1660 is a three section transformer. The LL1654 is larger and has greater primary inductance, when gapped for a given current, than does the LL1660, but it also has higher capacitance as a result of the greater number of sections. This means that the driving impedance must be lower than it would need to be to get the same high frequency cut-off that you could get with the LL1660. This is reflected nicely in the data that John presented.Use of the LL1654 with a tube that has an Rp of greater than, say, 1500-2000 ohms will probably result in roll-off in the audio band. It's a perfectly good transformer that can yield great results when applied properly (see John's comments), but comes with the warning just given.
Kevin Carter
K&K Audio
www.kandkaudio.com
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Follow Ups
- Comments on the LL1660 and the LL1654 - KevinC 15:28:10 08/30/03 (2)
- Can you clarify .... ? - akltam 00:56:13 08/31/03 (1)
- Re: Can you clarify .... ? - KevinC 04:08:16 08/31/03 (0)
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