Hello!
I still haven't built a preamp, but needing a small preamp, with a max of 8V for my car's subwoofer amplifier (it's being driven with 2V, with the amp regulator almost on max., since the woofer is a 12" unit, sealed), i decided to ask if this would do ok, or if any other sugestions would appear.
I'm thinking on using a small HF switch mode psu, so noise would be already subdued by the aikido.
It's just that i want a tube somewhere on the car, to be a unique and personal kind of setup.
Thank you very much!
I still haven't built a preamp, but needing a small preamp, with a max of 8V for my car's subwoofer amplifier (it's being driven with 2V, with the amp regulator almost on max., since the woofer is a 12" unit, sealed), i decided to ask if this would do ok, or if any other sugestions would appear.
I'm thinking on using a small HF switch mode psu, so noise would be already subdued by the aikido.
It's just that i want a tube somewhere on the car, to be a unique and personal kind of setup.
Thank you very much!
Take a look at the 6GM8/ECC86. It's an automotive relative of the 6DJ8/ECC88. Would you believe that the max. allowable plate voltage is 30. 
6GM8 data sheet: http://www.mif.pg.gda.pl/homepages/frank/sheets/035/6/6GM8.pdf
6GM8 data sheet: http://www.mif.pg.gda.pl/homepages/frank/sheets/035/6/6GM8.pdf
Hi Simpleton (somehow that feels so wrong ),
I've done quite a bit of spice simulation of the Aikido circuit and if the tube models are accurate (Duncan amps) the Aikido's power supply rejection strengths are strongest at low frequencies. At some knee point (typically in the range of 10 kHz, depending on tube, etc.) PSRR starts decreasing linearly at 6 dB per octave starting from between -30 dB and -40 dB.
Again, these are all simulation numbers not yet confirmed on the bench so reality may vary. If it were my project I'ld still approach a switching supply with caution.
),I've done quite a bit of spice simulation of the Aikido circuit and if the tube models are accurate (Duncan amps) the Aikido's power supply rejection strengths are strongest at low frequencies. At some knee point (typically in the range of 10 kHz, depending on tube, etc.) PSRR starts decreasing linearly at 6 dB per octave starting from between -30 dB and -40 dB.
Again, these are all simulation numbers not yet confirmed on the bench so reality may vary. If it were my project I'ld still approach a switching supply with caution.
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