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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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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Re: Please define too low ? posted by Dave Davenprt on December 6, 2003 at 05:51:33:
Dave,In fact that is the most troublesome thing that can happen and the DIYer that have to deal with. After you try another value of resistor, and then how can you remember few hundred hours ago with another.
I was using a 1660/25mA before I try to use the LL1654. Immediately I found that the LL1654/40mA does not do too well in the treble section. (without a terminating resistor) And I knew at that time I cannot expect a new output transformer to be at its best. It was such an agony that I have to wait for it to break in. Time move so slow while you wait.
Then I try different configuration and also I don't need too much gain, I use the LL1654/40mA with the 5K:150 configuration plus using a 470 ohm resistor on the secondary. It doesn't sound good at first. (that is what I found). After some time, it seems that it does improve. I then use a signal generator to test the response of this 1654 with 6C45(running at around 36-37mA). It was indeed pretty flat from 22Hz to 20K. The interesting thing is as soons as I get it down to 21Hz, the gain dropped. (haven't got time to test the band beyond 20k)
Too little time, too lazy to try some other values of resistors.
Thanks for sharing your experience.
Alan
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Follow Ups
- The breakin problem. - akltam 07:15:59 12/06/03 (0)
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