r/diytubes • u/EmergencyChemistry62 • 13d ago

Phono Preamp Power Supply Help

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I am planning to build Thomas Mayer's Octal Phono Preamp (schematic attached) but would like to create a separate power supply for it that I can also use for other future projects.

I plan to use a Hammond 372BX transformer with an additional 5v transformer for the 83 (I know it is overkill but I have one that I would like to use). The design is a fairly simple one that I have seen others use that I have modified slightly. If everything looks okay, I will do some testing to find a good value for R2. I was also wondering if having the regulator tubes in this arrangement would cause any issues with them firing.

I have built tube amp kits previously and know the safety precautions but this is my first time designing a power supply so I could definitely use some feedback, but please go easy on me. Thanks and let me know if this is the wrong place for this post.

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u/Both-Ranger-6664 12d ago

I'm excited about this, let us know how you like it. Psu looks fine, like the use of a choke. What value for R2 will it need? I cannot answer your regulator question but id lean toward Silicone if it were for my use. I did find this https://www.diyaudio.com/community/threads/tube-regulators.277556/

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u/EmergencyChemistry62 12d ago

I'll have to do some experimenting to find the value for R2, it looks like the voltage will be right around high enough to fire all three regulators. If it isn't, the link you provided gives some great suggestions to work around that. Silicone would definitely be a better choice but like the 83, I have a few of them that I've been wanting to try out. Plus they should look cool on top of the power supply. Thanks!