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  1. alfa88

    transformer blowing fuses

    Okay , that changes my 1st post. When you talked about 16 Ohms I assumed you were referring to an output transformer. Now I'm confused. You say it outputs DC? That can only happen if there is/are rectifier/s involved. Another thing: if, indeed, you have everything disconnected from the...
  2. alfa88

    transformer blowing fuses

    Clarification Are we talking about an output transformer or a power transformer?
  3. alfa88

    transformer blowing fuses

    impedance Welcome to the forum. The value you speak of would be impedance not resistance. Think of impedance as an AC resistance . Compare the resistance of the other channel's transformer to verify the values are similar. My hunch is that it is something other than the transformer. A picture...
  4. alfa88

    quick question: Nixie...

    Alphanumeric Nixie Source I came across this site while looking for tube info. http://www.die-wuestens.de/eindex.htm
  5. alfa88

    High- Voltage Adjustable Regulator

    It's a good thing I asked. So are you saying get a couple Euro. 1:2 transformers, parallel the '2' windings as input and connect the '1' windings in series as output?
  6. alfa88

    High- Voltage Adjustable Regulator

    Transformer Options I've been exploring circuit options but step 1 seems to be finding a transformer. I've seen a suggestion on finding and scrapping old 'boat anchor' oscilloscopes but it occurs to me that I could simply get step-down transformers and reverse them. An example would be 120 Volt...
  7. alfa88

    Wanted: Realistic TM-1000 Manual

    It is a radio tuner produced in the late 70s. It is a an analog tuner that features a phase lock loop circuit dubbed Auto-Magic and a nice wood cabinet. I stupidly gave mine away but am awaiting an EBay win.:D
  8. alfa88

    High- Voltage Adjustable Regulator

    Nice,nice, nice. Looks like I have a new project. Thanks.
  9. alfa88

    High- Voltage Adjustable Regulator

    I'm looking to build a bench power supply to do some vacuum tube(valve) experiments and was wondering if anyone knows of a solid state solution for a adjustable voltage regulator that could withstand 350Vdc input, output 300Vdc @~ 300ma. I got to about the 6th page on Google and start seeing the...
  10. alfa88

    Controlling electronics from my computer

    Most electronics these days use digital controls as apposed to analog (potentiometers variable capacitors etc.). The heart of the digital control is a controller chip that turn the pushbutton 1s and 0s into the varied output, On occasion I have seen motorized potentiometers that I suppose could...
  11. alfa88

    Evolution of Electronics

    That's more precise than my story. I see alot of sources gloss over those details, I'm in the midst of rediscovering what a marvelous technology they are.
  12. alfa88

    Evolution of Electronics

    I'm wondering if anyone else had heard this story. When Edison finally developed a practical light bulb he observed that there would always be a deposit forming on the glass. That is when he added an additional element to the bulb to try and alleviate the problem. That's when he discovered the...
  13. alfa88

    Pink Noise Generator

    Heh heh. I can't really say I've bought anything from him but he does have some nice pc boards, lots of schematics and masks.
  14. alfa88

    Cable for Elenco SG-9000

    The 50 ohms I speak of is the impedance of the cable. RG-58U is fairly common 50 ohm coax. As for length, just keep it reasonable. Around 3 feet (1meter) . For the test lead side use flexible wire, say 4" (10cm). I like an alligator clip for ground and an easy hook type clip for the signal...
  15. alfa88

    Pink Noise Generator

    You might want to check out one of my favorite sites. http://www.musicfromouterspace.com/index.php?MAINTAB=HOME&VPW=1024&VPH=500 If I remember right I used a Zemer in place of a transistor for noise.
  16. alfa88

    Cable for Elenco SG-9000

    I was going to tell you to look it up but when I saw the manual it looks like they don't want to tell you. There is a section where they mention hooking up a 50 to 200 Ohm resistor. It's been my experience that sig. gen. outputs are 50 Ohms. A replacement test cable can be had most likely from...
  17. alfa88

    Vacuumtubes.net

    Update vacuumtubes.net is not only legitimate the prices and shipping were reasonable. My only gripe is their communication (or lack of) was a bit um-nerving. I got the parts quickly though and they do have a very informational web site.:D
  18. alfa88

    Wanted: Realistic TM-1000 Manual

    I'm looking for a manual either owner's. service or both.
  19. alfa88

    will gfci work on ungrounded circuit?

    Ground If your electric box is metal you may be in luck. They are sometimes grounded. Verify by ohming out from the box to the nearest cold water line. Shut the power off to play it safe. Otherwise bite the bullet, open up the walls and run a ground wire from a fore mentioned cold water pipe...
  20. alfa88

    Vacuumtubes.net

    Has anyone ordered from these guys? They're based in Florida. I did a web order last night and was expecting an Email notification like I get from everybody else. Nothing. Called and was told I'd get a call back.
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