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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 1st March 2018, 08:10 AM   #11
michaeljessen is offline michaeljessen  Denmark
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Join Date: Jan 2017
Location: Jylland Als
I am looking forward to finish my SE 45 building. I hope there is enough power... my speakers are 92 db efficiency. The output transformers are from the swedish LUNDAHL LL1620 60mA. I think this have also an influence off the output power. In the speaker cross-over I have connected a RLC element (resistor,coil,capacitor)

Letīs assume you have a loudspeaker with 8 ohm, having its max impedance of 16 ohm at 1000 Hz. The impedance rise is of no importance when a conventional amplifier is being used.

However, if you connect this speaker to a valve amp. then this impedance rise leads to an excessive level at 1kHz. Therefore, this impedance riseshould be compensated for in the crossover.

To achive this a RLC element should be connected in parallel to the crossover. The component values are calculated by entering the following data:

the nominel impedance of the loudspeaker ( 8 ohm)
The increased impedance that needs to be corrected (16 ohm)
The frequency where the maximun impedance occurs (1000 Hz)
The neighbouring frequency where the impedance drops - exactly to half its value (12 ohm)
impedanc correction for a valve amp.
R in ohm 16
L in mH 1,62
C in uF 15,63
note: R= sum of resistance- value and resistence of coil.
I have a link I can send: RLC serial Resornant Circuit Calculator.
Michael
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