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[Satchwine]

Hi everyone,

I’m new here so go easy on me… I’m after a power supply for a AKG C28. old tube 6072. I have the mic and mic plug, but nothing other than that including connector to power supply. I may have an opportunity to buy an N12a power supply. Will this work with this mic or do I need an N12? Any help most appreciated. Cheers Marcus

[klaus]

The C28 with 6072 requires a high voltage of 120VDC, with minimal current draw, so there will be no problem at all for the N12A to supply your mic with B+: it is specified to deliver 120VDC, just like the N28.

However, the C28 needs around 175mA to supply 6.3V for the 6072's tube heater (the N12A power supply was designed to supply a 7586 Nuvistor-equipped C28c, which has a current draw of 122mA).

I believe the current draw between the two tubes is still close enough to give your N12A a try, considering the beefy heater supply in N12A.

Nothing will go up in smoke, and at worst you will not reach the required 6.3VDC, measured at the 6072's heater wire. But I think you will be fine, after adjusting the heater trim pot inside the N12A.

If you are not competent in doing work in high voltage environments with deadly currents present, hand the job off to a specialist!

[Satchwine]

Thanks so very much Klaus.

In your opinion should I go with this option or am I better of having a new supply built, assuming this supply works well.

Thanks again Marcus

[klaus]

I would start with what you have.