Tube DIY Asylum

RE: Need to build/buy a power supply

24.27.41.140

Triode_Kingdom

In Reply to: RE: Need to build/buy a power supply posted by FlaCharlie on January 25, 2025 at 08:11:21

For that kind of money, a linear supply has a lot fewer parts to fail.

Follow Ups:

RE: Need to build/buy a power supply - 1974 05:45:19 01/26/25 (10)
So it looks like the power supply suggested here would work and the price is reasonable. I just need to figure out a few more details.

The amp has a male gf12 3 pin aviator connector, so it looks like I need a female connector of the same type, but I'm not sure which one to get. There are ones with a cord preinstalled, but only 3 wires, so nowhere to attach the 300V ground. I can get just a gf12 connector and theoretically solder on my own ground, but is this even right?

The green wire appears to positive for the 6.3v, the black wire the ground, and the red wire the positive for the 300V. Would the negative 300V attach to the chassis via the GF12 connector its self?

The other issue is the filtering. Would this power supply be okay on its own or would I need to add filtering and if so what and where?
- 3 wires is all you need. The heater and the 300vdc share a ground wire. - Tre' 17:45:46 01/27/25 (0)
  .
  Have Fun and Enjoy the Music
  "Still Working the Problem"
- RE: Need to build/buy a power supply - 1974 07:05:32 01/26/25 (8)
  Hoping this is helpful.....
  - Yep, no power supply in there... (nt) - Triode_Kingdom 09:14:43 01/26/25 (7)
    nada aqui
    - I wonder if "AC In" is in reference to the level of ripple in their power supply? - 1973shovel 05:39:23 01/27/25 (6)
      Forgive my sarcasm. Perhaps it's a translation issue.
      - RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? - 1974 07:12:22 01/27/25 (5)
        
        In Reply to: RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? posted by 1973shovel on January 27, 2025 at 05:39:23
        
        I have pretty much resigned myself to the fact that the only way I'm going to get this amp working is to just suck it up and buy the original power supply for $260. I picked this thing up for $50 hoping that building a power supply would be simple, but that is proving not to be the case.
        
        "hoping that building a power supply would be simple" - 1973shovel 07:43:16 01/28/25 (2)
        
        In Reply to: RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? posted by 1974 on January 27, 2025 at 07:12:22
        
        I do understand your thinking. Is resale value of any concern? If so, you're very likely better off buying the stock power supply.
        
        If ultimate performance from that circuit is your goal, sure you could probably build a better supply than what they're offering.
        
        But if you take into account the cost of a power transformer (or transformers, if you use a separate filament transformer), a properly sized choke, caps, umbilical/connector, etc. etc. the cost starts to quickly add up.
        
        And that's not even including the chassis. If you're OK with assembling an open power supply on a piece of plywood, then you're good. But if you want the supply in a decent looking chassis, that's where the work and expense really comes into consideration.
        
        Good luck.
        
        RE: "hoping that building a power supply would be simple" - 1974 08:29:14 01/28/25 (1)
        
        In Reply to: RE: "hoping that building a power supply would be simple" posted by 1973shovel on January 28, 2025 at 07:43:16
        
        Resale value aside, I'm not sure that a bunch of components, some of them carrying 300V, screwed to a block of wood is what I'm looking for.
        
        Also if the 6.3 and 300V have a common ground, then the suggested SMPS will definitely not work.
        
        RE: "hoping that building a power supply would be simple" - FlaCharlie 12:45:50 01/28/25 (0)
        
        In Reply to: RE: "hoping that building a power supply would be simple" posted by 1974 on January 28, 2025 at 08:29:14
        
        You apparently have not looked at the links I provided earlier, especially the one to the amp my granddaughter built.
        A single 100 Ohm resistor isolates the grounds and it is not simply mounted on a piece of plywood.
        My 10-year-old Granddaughter's Amp (Open in New Window)
        
        Edits: 01/28/25
        
        RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? - FlaCharlie 09:05:56 01/27/25 (1)
        
        In Reply to: RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? posted by 1974 on January 27, 2025 at 07:12:22
        
        The SMPS I suggested WILL supply the 300v and 6.3v required. The only question is if it will be quiet enough on its own using headphones. To me it would be worth spending $50 to try it then add some additional filtering, if necessary.
        
        You could also build a more traditional linear supply from scratch for much less than $260.
        
        You should be able to use the existing connector but there's no reason why you couldn't use some other type or even hard wire them.
        
        Other than pointing out the fact that they mislabelled the connection as "AC In" nobody has offered an actual solution.
        
        I would be concerned about the quality of the original supply given the fact that the company can't even label the PS input correctly. Have you asked them about that? Are they willing to supply a schematic?
        
        RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? - Triode_Kingdom 14:27:49 01/27/25 (0)
        
        In Reply to: RE: I wonder if "AC In" is in reference to the level of ripple in their power supply? posted by FlaCharlie on January 27, 2025 at 09:05:56
        
        This Chinese company has a terrible reputation for faking specifications. Who knows, the original PS might be noisy too.

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