Recent content by thefragger
  1. thefragger

    Beta22!

    Quote: Noted.   I'm off to Europe later today and I'll redo the resistors wen I get back.
  2. thefragger

    Beta22!

    I doubt I'll be running speakers at the beta22's rated 50WPC--my 208WPC (measured, Sony rated it at 100WPC) Sony TA-F6B amp (which I repaired/restored) is rarely used past 1WPC according to the meters, which, when relating to the volume knob, translates into 9.30~10 (with zero existing at 8...
  3. thefragger

    Beta22!

    It's worth noting that I plan on using this amp with loudspeakers and my Stax Earspeakers, as well as headphones.   AMB? Since this is your baby, what do you think?
  4. thefragger

    Beta22!

    How would I resolve the situation if it becomes an issue (aside from having it right down near the PCB)? Additionally, what failure mode should I be looking for regarding the issue of the additional assumed inductance presented by the additional lead length?   I didn't think it would be an...
  5. thefragger

    Beta22!

    Here's an early photo of my board--you can just see the gold line indicating the negative leg, and that it's facing the wrong way relative to it's taller mate in front of it.  
  6. thefragger

    Beta22!

          Quote:   That was an error on my part, the unregulated voltage was going through, I just made a bad assumption while not in the right frame of mind. I was reading the voltages at the tabs of the diodes and assumed that two tabs were (+) and the other two were (-)...
  7. thefragger

    Beta22!

    Well, now, it looks like my negative rectified voltage is -0V--that can't be terribly good!!! Bad diode? Bad wire clamp? Bad solder joint? I measured the voltage off of the tabs of the diodes; two read +42VDC and two read zero; the secondaries are okay, which logically means that it's the wire...
  8. thefragger

    Beta22!

    Morning! For some reason I couldn't reply last night: I'll get to testing later on today, I was just curious if anyone else had come across this problem before.   KnightOfAwesome: I saw that on the AMB website, I'll get to that later today.   johnwmclean: According to the...
  9. thefragger

    Beta22!

    Right, okay, so I built my supply to +/-30VDC. At first I fired it up, the LED didn't light, so I flipped it around and re-tested--a-okay! Light lit up and I measured roughly +/-20VDC (+/-18.75VDC~ish each rail), which was weird.   AH! R10 is 10K, oops! Okay, so I swapped out R10 for a 6.81K...
  10. thefragger

    Beta22!

    Thanks!
  11. thefragger

    Beta22!

    SCHOOOOOL'S OUT FOR SUMMER!! I've been busy and I'm ready to run a test.   Quick Q: what fuse rating should I use for a three-board setup running at 30V? Fuse will go at the primary of the power traffo.
  12. thefragger

    Removing AKG K140 Drivers?

    No no, they didn't break, they're soldered onto the tab, so when you heat the tab up, the vc lead separates. I managed to fix one after I installed the mismatched set, but fear that more heat will un-fix it. Quite the conundrum!   Also, I did try grabbing it with tweezers on one driver--the...
  13. thefragger

    Removing AKG K140 Drivers?

    Holy moley I haven't logged in on here in a while!   Alright, I fitted the new drivers in a while ago--the problem I found with the busted drivers is that there's zero mechanical connection between the tinsel leads and the solder tabs, so when you heat the tap up, the tinsel lead lets go and...
  14. thefragger

    Holy Moley

      Winter break--I can almost taste it! I've one last exam on Tuesday and at 11am I don't have to study anything again until mid January!   WOO!!   This past semester I pulled a 120% courseload and it left me with absolutely ZERO time for a social life, outside of a quick visit from the...
  15. thefragger

    Removing AKG K140 Drivers?

    I wound up using a coping saw to free the drivers. Worked like a charm!
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