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WawaWHUT? This is one confusing preamp!

#282
agedhorse said:
How does using a 6.3v supply use less current and/or less power than a 12v supply? I think you have your Ohm's law formulas inverted.

Sorry, the safety rules/laws/regulations haven't changed in any significant way between 2008 and now.
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Measured it at the wall plug. I might be wrong about the cause of the difference in current draw. I've found that different tubes are using a different voltage at the plates, which may be it. The safety regulations sure are covered online more now than then. From what I understand many local jurisdictions started to enforce them more in the recent years.
 
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#283
Heater current has nothing to do with AC supply current as the (power) transformer normalizes the current so that the power remains constant. It takes a certain amount of power to achieve the necessary temperature to boil electrons off of the cathode. With the heater running at 1/2 the voktage, it takes twice the current to achieve the same temperature.

What you may be measuring is the result of different operating points, or the effects of different tube types in a circuit.

Safety regulations for electronic equipment are not handled at the local level. They are specified and certified nationally and internationally by a variety of agencies and organizations. In the US, that would be Underwriters Laboratory and the associated "Nationally Recognized Testing Labs" program that certify that a product is designed and built to the recognized standards.
 
#284
Which all comes back to the Statute of Anne. They can make all decisions concerning performing artists and expect no repercussions. As I understand from reading online, UL listing is recommended and not required. Were I to sell enough preamps in a short enough period of time I would certainly go for such a thing. Then I'd have to sell some more to pay for mass producing them. This is America, remember?
 
#286
What is a
Statute of Anne?

And how does regulating performance artists effect preamp manufacture?


nbtone said:
Which all comes back to the Statute of Anne. They can make all decisions concerning performing artists and expect no repercussions. As I understand from reading online, UL listing is recommended and not required. Were I to sell enough preamps in a short enough period of time I would certainly go for such a thing. Then I'd have to sell some more to pay for mass producing them. This is America, remember?
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#287
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#289
nbtone said:
First of all: hello to the spam patrol! I know this post will permanently ban me from talkbass, but it is time to answer to all the weirdness one more time.
Yeah I had to hire a safety engineer to get all the issues with Nitewalker Bass Preamps sorted out. There were spacing problems on one of the circuit boards, and there was no safety ground. I reinforced the enclosure, so that the front panel isn't so flimsy anymore, and I added a plate in the tube access area to prevent any hazards when changing the tube, due to the placement of a new circuit board. Other than that I had to resolder all the solder connections and make use of heat shrink tubing on every one of them, and I had to make everything look clean and sanitary. I replaced the faulty circuit board and added another. The safety ground issue took a whole lot of effort, and several talkbass people, in spite of all the banter, guided me to some extent. I don't use any solid state parts in my tube circuits, other than the rectifiers, and I have successfully made use of a 6.3vac filament supply. There is no bothersome hum. I don't do politics, but I think a whole lot of arbitrary laws are being made that benefit the electronics workplace and are destructive to the music workplace. .... Just saying. The 6.3 vac filament supply uses half the current that a 12.6vdc supply uses. That's reading at the wall plug, by the way. (Lower power bills, anyone?)
I first manufactured these in 2008, and the laws are a lot different now. I researched this in 2008, and I hired a respectable electronics company in the U.S. To design and manufacture the enclosure and the circuit boards. I assembled everything, and now I'm reassembling them. There is still a lack of quality bass amplification choices, so I'm still making preamps. I had a good sounding amp in 1966 from the 1950s, but when I needed a louder one I found that none of them were any good. Fifty years later the choices are no better, unless you use a Nitewalker Bass Guitar Tube Preamp. That is my perspective.
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You're going to have to try a lot harder if you want to get banned!
 

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