|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: Re: AC filament advice…? posted by JerryG on April 26, 2007 at 17:48:31:
Jerry,I don't know if the DRDs (including the Star Chief) use a standard DRD power transformer. But if they do, you might have a solution if you want to try a CMC.
What I am thinking is this:
My DRD 45s were tube rectified. Thus they have a 5volt 2 amp tap for the 5ar4. I am in the process of upgrading them to Star Chief (solid state rectified and regulated) so the 5 volt secondary won't be needed anymore. It could be used instead of the 2.5 volt secondary to heat the 45 tube. Currently I just have those leads taped off.
A 1 ohm choke drop + a few drop resistors could fine tune the voltage. It could also cause extra heat in the chassis so be aware of that.
Now I don't know if your amps have the 5 volt secondary, but if they do you would have enought headroom to try a few interesting heater approaches.
I am also going to try a pair of Tentlabs regulated current source Heater Supplies that I have in my parts drawer forever on my DRDs.
In the meantime I added a few drop resistors to fine tune my heater voltage to 2.45 volts AC.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- You May Have a 5 volt Secondary - Cappy 20:15:05 04/26/07 (2)
- FWIW Toroidal Common Mode Inductor Source - danlaudionut 20:53:17 04/26/07 (1)
- Re: FWIW Toroidal Common Mode Inductor Source - Cappy 10:44:18 04/27/07 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
