Search results

Search Forums New Posts
  1. S

    converting vacuum tubes

    I'm sure it can be converted (I don't have advice for how). What I'm responding to, is WHY would you want to convert it? It'll destroy the collector value of it, when you want to sell it. The 6L6 and 5U4's are readily available from a lot of places. I've got some old pinball machines that...
  2. S

    Car Power Inverters

    Consider contacting manufacurer for what to do. You can't be the only one who's doing this, and they may have suggestions.
  3. S

    PN2222 Question

    Ya gotta watch-out for counterfeit parts out of China. They're becoming a big problem from what I'm noticing. Most semiconductors anymore are made in Asia or the Pacific Rim, ...but buying out of China is asking for trouble, they're pretty unscrupulous.
  4. S

    Bringing audio equipment across the Atlantic

    Awww, lazy manufacturer support. The email address I contacted sent me a reply that says THEY only deal with stuff sold in the U.S. They gave me a new email address for worldwide support, if you want to try it: www.panasonic.net I checked the owners manual for your model, and it is ONLY...
  5. S

    Bringing audio equipment across the Atlantic

    I know you're in a hurry to run your new gear, but I'd wait a little while if I were you. I contacted the mfgr, and will see if they send me a reply. If this site will show it, the mfgr is: 2.panasonic.com If they get back to me, I'll post what they say about getting the SAAX540, bought in...
  6. S

    PN2222 Question

    The PN2222 is supposed to be the 2N2222, with no change in the pin-outs. Some manufacturers labelled the PN to designate plastic package. (the 2N2222 can come in plastic or metal can). I don't have an explaination for why your PN's pin-outs are different. Maybe a factory screw-up, and they...
  7. S

    Two button control for 4speed car fan

    There are several variables one would need, to design a circuit to do this (step up or down a speed with each push-button depression). Whatever additional parts you need, would depend on the voltage and current of the fan, and the value of the coils (which are acting as resistors to control fan...
  8. S

    Amplifier troubleshooting

    Hopefully *steve* will get back to you on your query to him. He's right, make SURE you've got the TO-220 case isolated from the heat sink, so you don't short it out. Mica isolator, or something similar, ....if you saved whatever you took from the assy when you removed the TO-220, you may be...
  9. S

    Tek 2235 Power Supply Revisited

    Yeah. You already did the diagnosis and troubleshooting, ....saving me a lot of my own looking, if I see similar symptoms. Good luck with the scope when you get the part.
  10. S

    Bringing audio equipment across the Atlantic

    You can't run the 60hz stuff on 50hz, and get clean audio. (Plus the voltage difference you probably have in Ireland, and the effect of the different freqs on the input). Check your manual you got with the Canadian purchase. Most of the Japanese designed stuff, has switchable 50/60Hz...
  11. S

    Potentiometer R-ranges

    It'd have to be a physically large pot to handle the amperage. And that won't be cheap in low resistances. Maybe somebody will give you a place to find what you're looking for in a later post.. I don't know how much experience you've got in electronics. If it was me, I'd be looking at a...
  12. S

    Tek 2235 Power Supply Revisited

    Yeah, I didn;t see how Tektronix would put the same part number on something that wouldn't work. You probably know it's not unusual for several different manufacturers to make parts for Tek or HP. They might still put their own numbers on them, but they'd have to meet the Tek specs, for Tek...
  13. S

    Tek 2235 Power Supply Revisited

    I went to the Sphere site. I see the one you were looking at is sold (Unitrode CMX647). But they also list the two Murata MSL8513's I mentioned. Several times I've emailed Sphere stuff I was looking for, that they didn't have listed. And they actually went out and found some for me. You...
  14. S

    Tek 2235 Power Supply Revisited

    Your inquiry to Sphere must have motivated them. They're now showing two used ones (they claim fully tested) for $69. Also one, looks like outside US for $49 on ebay. I'll look around some more, and post another note if I find something later. Nice job, finding it.
  15. S

    Transformer Design

    I don't know who makes up-to-date reference material on transformers. You might actually email a transformer company for suggestions on where to look for reference materials. Especially for critical design. I've used transformers that vendors claimed were equivalent to what I needed, only to...
  16. S

    Transformer Design

    I wouldn't even attempt it these days. More power to you if you're going to do it. With the advent of different wire composition and construction, iron core composition, and a dozen other variables, I leave it to the transformer companies to figure out. I've got five books on transformer...
  17. S

    transistor

    Trick question. Curve tracer will show the operating curve (which is not linear) Transistors or designed to be used IN THE LINEAR OPERATIONAL CURVE of the transistor output curve. There will be a portion of the curve where the transistor output is linear. Hard to answer that question...
  18. S

    Sony TV Channel Stuck

    Another thing to check before giving in to repair: I've got a Sony, and the 'ON' pushbutton plastic pushbutton itself hangs-up in the de- pressed position. You can't always see it, it flexes a little to one side (the plastic pushbutton you depress itself). When that happens, the Channels...
  19. S

    Denon AVR-2700 Stuck in Standby

    Trivia that may help. 1) Pull the plug and plug it back in, a few items (particuarly Blu-Ray players), reset the memory controls to default, and restart themselves when re-energized. 2) The fuses you found, sound like speaker protection fuses. I know you've got power to your LED's, but are...
  20. S

    Monitor is too bright… Brightness cant be controlled!!!

    If you have solid-state potentiometer, look at the integrated circuit variable resistor chip. Mine was a different model, but the variable resistor chip failed, and screen went to full brightness, with no control.
Top