Lundahl LL1517. What is it good for? - diyAudio
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Old 23rd January 2009, 04:07 PM   #1
Tyimo is offline Tyimo  Hungary
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Default Lundahl LL1517. What is it good for?

Hi!

Could somebody tell me What is the LL1517 good for?
Is it possible to use in tube circuit?
Something like the Raven preamp has in the input?

http://www.lundahl.se/pdfs/datash/1517.pdf

Tyimo
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Old 23rd January 2009, 04:15 PM   #2
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Hi

The LL1517 is designed to be driven from a very low source impedance. The datasheet even mentions 'minus 18' as the optimum source. The frequency response is given when driven by a source resistance of 10 ohms, fed into 600R. Those are too low values for tubes. Ok, a white cathode follower may achieve a R out of 10 ohms and not distort to much when driving 600R, but that is about it in the 'tube world'.

Erik
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Old 23rd January 2009, 04:37 PM   #3
Tyimo is offline Tyimo  Hungary
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Hi Erik!

I would connect it between the CDP and the tubepre.
I think a solid state CDP has low output imp, it isn't it?

Tyimo
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Old 23rd January 2009, 04:53 PM   #4
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CD-players do have low output impedances, but if it is as low as 10R I don't know. Best thing is to check your manual. It is also important to terminate this transformer with at least 600R. This can be a tough load, or introduce a LP cutoff in the output coupling cap (if present) is too low in value.

Chech the driving habilities of your CD-player! I don't know if the manual shows this information, however.
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Old 23rd January 2009, 06:10 PM   #5
Tyimo is offline Tyimo  Hungary
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The manual doesn't shows this information.
I think I have to try it and I will terminate the transformer with 600R +10nF.

Greets:
Tyimo
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