Hi,
I have a pretty early Alembic F-2B preamp, which is fantastic.
In the past, I've run it's output into an off-the-shelf DI box for recording, or in between a power amp
I'l like to build a dedicated DI box for it, with a transformer that has an optimal input impedance. I am curious to see if any difference would be noticeable.
Alembic's datasheet states an output impedance of 91K
http://www.alembic.com/support/F2B_manual.pdf
Would anyone have a transformer recommendation that would best suit this application (91KΩ to 600Ω)?
Or, is this a total waste of time, and i should just stick with what I've got? (Whirlwind, with what i believe is 1MΩ input impedance)
Thanks in advance.
I have a pretty early Alembic F-2B preamp, which is fantastic.
In the past, I've run it's output into an off-the-shelf DI box for recording, or in between a power amp
I'l like to build a dedicated DI box for it, with a transformer that has an optimal input impedance. I am curious to see if any difference would be noticeable.
Alembic's datasheet states an output impedance of 91K
http://www.alembic.com/support/F2B_manual.pdf
Would anyone have a transformer recommendation that would best suit this application (91KΩ to 600Ω)?
Or, is this a total waste of time, and i should just stick with what I've got? (Whirlwind, with what i believe is 1MΩ input impedance)
Thanks in advance.
For the mono mode. Are you doing that? Each side alone is 40k.
Triodes are not real fussy about loading. If you need a teeny number on the THD meter, you want as high an impedance as you can manage. Since this question maybe goes in the Musical Instrument section, 2%-5% THD may be "nice" but only the ear can judge.
Whirlwind DIRECT2 seems to be 80k input?
Model # - DIRECT2
Impedance Ratio (input to output per channel): 133:1 Frequency Response: 20Hz-20kHz ±1dB
Level Change (input to output): -20dB (pad out), -40dB (pad in)
If actually loaded in 600 Ohms, 600*133 is 79,800 Ohms. (But true 600r input is real rare today.)
Also their numbers don't add up. -20dB implies 10:1 turns ratio and 100:1 impedance ratio.