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Old 24th October 2001, 04:13 AM   #1
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I was wondering if any one out there would have or know were to find a 12 volt power supply for maybe a SE 300b ?
I have built a pair of 300b mono blocks for home and I would really like to try to make some for the car.

Any help would be great.
Brian
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Old 26th April 2007, 02:48 PM   #2
w5jag is offline w5jag  United States
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Consider an old solid state 12 volt power supply designed for some of the older tube ham radio transceivers. Virtually no one runs these radios mobile any more, so a supply should be dirt cheap. Sometimes these even show up as NOS for about dirt cheap.

Drake DC-3, DC-4, Collins MP-1; there are likely many others out there.

Use it as-is, or gut it for the parts. If I were to build a mobile tube amp, this would be my starting point for power.

Win W5JAG
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Old 27th April 2007, 12:27 AM   #3
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this is my 300b car amplifier
out put is 8 Watt + 8 watt

power supply is 12 volt to 110 volt 60 or 50 Hz
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File Type: jpg car_300b_1.jpg (99.6 KB, 298 views)
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Old 27th April 2007, 12:34 AM   #4
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this is one of the power supply
http://i35.photobucket.com/albums/d1...CIMG4604_1.jpghttp://i35.photobucket.com/albums/d193/zzzzaudio/CIMG4604_1.jpg [IMG]Click the image to open in full size.[/IMG]
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Old 27th April 2007, 12:42 AM   #5
agent.5 is offline agent.5  United States
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If you use output transformers and accept a hybrid approach, you don't even need a power supply. Just run the amp at 12VDC. There are plenty of tubes that can run on 12VDC and use them as voltage gain. Use mosfet followers for current gain.

Look up Susan Parker's thread on the solid state forum.
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Old 27th April 2007, 01:02 AM   #6
w5jag is offline w5jag  United States
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Quote:
power supply is 12 volt to 110 volt 60 or 50 Hz [/B]
Neat. Did you pull the inverter board from an old UPS?

Win W5JAG
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Old 27th April 2007, 11:03 AM   #7
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yes, this is ups
for computer
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Old 27th April 2007, 12:38 PM   #8
Merlinb is offline Merlinb  United Kingdom
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This could form the basis of a VERY cheap and dirty 12Vdc step up PSU:
http://web.telia.com/~u85920178/use/tubepsu.htm
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Old 27th April 2007, 01:37 PM   #9
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Why not just buy a regular DC-to-AC power inverter? These things are dirt cheap these days. That way you just plug a home amp into the AC power. The output is typically a distorted, noisy waveform, so you'd want to make sure you've got line filtering in between it and the amp, but you'd have to do this for any switching option anyway.

Cheap power inverters

The idea of 300B filaments jangling along with road bumps and vibration gives me the willies, but I guess you could vibration-isolate the chassis as much as possible.
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Old 27th April 2007, 03:04 PM   #10
w5jag is offline w5jag  United States
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Quote:
Originally posted by Merlinb
This could form the basis of a VERY cheap and dirty 12Vdc step up PSU:
http://web.telia.com/~u85920178/use/tubepsu.htm
All of the old mobile supplies are pretty much the same as this in principle.

Win W5JAG
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