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Les_Garten

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Posts posted by Les_Garten

  2. How to: transformer-based impedance-matching box

    in Do It Yourself

    Posted

    I take that back. It looks like power transformers on both sides, and tubes in the middle? Does it really take 2 power cords? Odd.

    Anyhow, it looks like a solid state bridge rectifier sunk on the side and a CRCRC filter for B+. It also looks like AC heaters. Either of those could cause hum. To lower B+ ripple, you could add a choke -- it will not only reduce ripple, but it will also take some edginess off the sound. Heaters are a little harder as the 6080's draw a lot of current which means big diodes and a lot capacitance. It is also tricky to get 6.3VDC out of a 6.3VAC winding.

    Honestly, I'm not sure I'd bother.

    Hey, yeah it has 2 Power cords, each feeding a Transformer. I was looking at those heater runs as well, but they would be kinda a pain to change.

  3. How to: transformer-based impedance-matching box

    in Do It Yourself

    Posted

    It looks like it's already transformer coupled. The proper solution is to just fix the hum. It could be power supply noise, heater noise, grounding, or magnetic coupling.

    It seems that it is a Family characteristic of this amp in that it hums a "little" with Low impedance cans.

    Here's the inside of the amp for anyone interested. The JPG is big, beware.

    http://www.turbonet.biz/misc/337seReview/AAA_1430.JPG

  9. Fluke 179?

    in Do It Yourself

    Posted

    That would be cool. Just flashed my meter and I want to try and see how well the screen capture function works.

    I founded it. It's about 100mb. I'm uploading it, may take a little bit. I'll PM the link. It's 3.3. Enjoy, Post some screenshots!

  16. The Headcase Stax thread

    in Headphones

    Posted

    I'd use the SR-003 for that.

    The SR-003 will tell you a lot if something goes wrong. Wrong bias voltages scream at you and it's great for picking up hum.

    Hmmm, didn't think or consider that. I was just going to pick up some 303's for testing, but that seems a lot of $$$ to tie up just to test. So them thought about some lower end older STAX. I want something to test listen with before plugging in O2s. I'll look over the 003s, thanx!

  21. Fluke 179?

    in Do It Yourself

    Posted

    bought one too just now :D

    FOTM!

    FOTM! FTW!

    I also just tested the hfe function on it which is pretty sharp as well. There is a little wheel of holes with 4 different ways to plugin NPN and PNP transistors and select hfe on the selector. Works like a charm!

  23. Fluke 179?

    in Do It Yourself

    Posted

    Mini Review of VC99

    So I ordered one of the VC99s last week from a guy in California. I bought Late on Thursday and revived it today, nice!

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380176463237&ssPageName=STRK:MEWNX:IT

    It is not a Fluke. It was $29.49 + $10 shipping. It is worth the cash in my opinion. The temp input is interesting. I haven't played much with it to see how fast it is. The auto ranging is a little slow. You notice this the most when you are trying to test continuity with the spkr on. It takes a second or so to stabilize. Fluke has quicker internal processing, at 10-15x the price of course.

    It doesn't have a backlight, that's a shame. The display is very large, Like a Fluke 179, very easy to read for us folks whose eyes are ancient. The hfe measurement will be fun to try.

    The switch and case are not Fluke quality but are "pretty" good. It's a world better in every regard from the last $15 meter I got free with a battery. The probes are worth about $10 alone, they seem to be made pretty well.

    It has a rubberized covering that is a little harder plastic than the fluke rubberized cover, the color is more orange than the Fluke yellow.

    I haven't checked all it's specs in exacting detail, but I think it checked bigger caps on the cap test than MY Fluke which is an Original 87 model.

    The function buttons look like Drunken Master installed them. They are all crooked. I noticed this in the pix online before I purchased it. However, they all seem to be very solid and other than cosmetically bad, there aren't any issues.

    All in all, it seems worth the $29 + shipping. I would buy another.

  24. Blue Hawaii Special Edition

    in Headphone Amplification

    Posted

    It's from a Guide to EL34/6CA7 I bought off eBay, it's a PDF file.

    It's my secret weapon in the eternal struggle against fellow BH and other EL34 amp owners. Yes, that's right, fellow BH owners are the enemy in regards to tube acquisition operations.

    Ya, doesn't this mean that replacing all four will lead to more improvements than replacing the single fuse in other amps? :P

    Lokks like a great Stocking Stuffer for all your Audiophile friends.

    Season's Greetings!

    ;)

  25. The ultimate DIY? A Stax SRM-T2!

    in Do It Yourself

    Posted

    So its going to end up cheaper than i thought.

    So sue me.

    Mostly its because the power supply board is not going to be full size

    and that is going to make things cheaper.

    So the amplifier board really is what i said above unless there is some other

    charge i don't know about.

    I'm sure there will be few opportunities to use the word "cheaper" in this project! Indulge yourself!

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