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  1. wattsabundant

    3 WOPL's in the pipeline (+1)

    As frequency drops, the size of the iron core of a transformer increases. So if the input transformer is rated for 50 Hz it will have no problem at 60 HZ. Also the ripple frequency of the power supply will be higher and the bulk caps would provide slightly less ripple voltage although it's not...
  2. wattsabundant

    Phase liner PSU

    Yea, I had the industrial version. I ran it on single phase 208 and derated it.
  3. wattsabundant

    PL400 series 1 popped short fuse. what to check?

    When outputs go the fuses turn completely black due to sustained arcing. Thee AGX fuse is not intended for 80 VDC. I'm guessing the 5A fuses actually opened due to overload and replacing them one time may be ok
  4. wattsabundant

    Phase liner PSU

    About 20 years a friend bought a truckload (literally) of 10kw Crown amps. They only put out about 30 volts but would go down to about 0.5 ohm load. They came out of an MRI system. Input was 208, 3 phase. I used one as a variable frequency source and ran a 480:120 volt transformer backwards...
  5. wattsabundant

    I’m considering an iron upgrade…

    Perry, You're right, the Pace is ADS200. 2.00 reading glasses at a distance is my excuse. Can anybody explain the difference between the Weller bases and what irons are compatible with what base?
  6. wattsabundant

    I’m considering an iron upgrade…

    I use a Pace AD5200 for board level work. The fact that it its 700 degree in about 5t seconds appealed to me. Will the Weller's mentioned here work for the 40 amp bridge rectifiers and 12 gauge stranded cables etc? I bought one of the hot air SMD that I've used on back planes. Have to be...
  7. wattsabundant

    Phase Linear 700 series 2 questions

    I'm not a fan of whoesale parts replacement, especially on the board. Without good techniques and the right desoldering tools it is very easy to damage the board. If it's not blowing fuses the outputs are probably good. R101, 7.5K/2W is a common failure. For less than $400 you can get an...
  8. wattsabundant

    Derek92994's 700 Ser II White Oak conversion

    Attached is the page from the 400 manual on how to test outputs. It's not in the 700 manual. It works for just about any traditional amp. Read it 2 or 3 times and do what it says and you'll find the shorted device(s). Note that replacement of fuses multiple times does at least $100 worth of...
  9. wattsabundant

    Who is the Dynaco guru here? Just found a gorgeous Dynaco stack

    Working on a 400/416 driver board is a PITA. Doing so will certainly mess up a neat assembly job. Thank the tech who labeled stuff and left it for the next tech.
  10. wattsabundant

    Who is the Dynaco guru here? Just found a gorgeous Dynaco stack

    I bought a 400, PAT5, and a FM6 at an estate sale last year. The assembly had to be factory as it was so neat. The amp and preamp had a few bad coupling caps. Barely made 200 watts at 8 ohms. Otherwise it was fine. Sold the set on EBAY. In the early 90's I did sub contract work for Sound...
  11. wattsabundant

    Phase Linear 5000 Series 2

    Here's the manual
  12. wattsabundant

    Dynaco Stereo 400

    Back in the late 80's and early 90's I tested about 500 driver boards for this amp and it's siblings the 410 and 416. I didn't necessarily like the totem pole output section but it met spec and was reliable. If i didn't have a 200 W/C amp I wouldn't hesitate to jump on this one. It uses all...
  13. wattsabundant

    NOS OEM Phase Linear plastic RCA jacks

    Yep, they're OEM and with that comes more broken jacks and cracked solder joints.
  14. wattsabundant

    Dick Burwen's Amplifier Problem

    The loud pops that are mentioned in the article are not likely to be caused by outputs. The more common issue is the TO92 transistors on the front end.
  15. wattsabundant

    PL400 II Chassis Spare Parts

    An ultra reliable 400 would use the 700 chassis and heatsinks with the bolt pattern of a 400 transformer. 10 outputs per channel = lower dissipation by each one. It would be hard to blow that one.
  16. wattsabundant

    PL400 II Chassis Spare Parts

    Not to argue, but my experience was there were racks and racks of 400's in rocke and roll PA's. They wered modified with front panel fuses and level controls. When done right, the lower outside transformer bolt was replaced with a longer one and a bracket was installed to support the...
  17. wattsabundant

    Wopl 700 series 2 with a slight buzz at midrange speakers

    As for the noise, the input jacks "float" from the chassis. Float means they are not directly connected to the chassis. The jacks should have a fiber washer on both sides of the chassis. Sometimes people eliminate the washers thinking it will improve noise. I think not.
  18. wattsabundant

    Wopl 700 series 2 with a slight buzz at midrange speakers

    Looks like my brother's writing. He's an architect.
  19. wattsabundant

    Bosch's system

    There was a commercial a few years ago with a vintage Marantz receiver but they Photoshopped Marantz off of the front panel.
  20. wattsabundant

    Help a crazy old man.

    for the time being send me a PM if there is a dire need.
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