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  1. Replies
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    Replacement of the switching controller (IC6)...

    Replacement of the switching controller (IC6) restored the DSP/CPU DC supply voltage to +3.3V.

    Unfortunately, my OC-3 still does not function.

    A self test run according to the procedure...
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    The MOSFET appears to be fine. No shorts between...

    The MOSFET appears to be fine. No shorts between pins 1 and 3, 1 and 2 or 2 and 3.

    Someone also also suggested removing IC6 and the MOSFET from the board and replacing them with a conventional...
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    According to my scope there's no square wave...

    According to my scope there's no square wave signal on pin 4, so I guess the IC is the source of the problem. I'll update this thread as soon as I have sourced and installed a replacement.
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    I do have a scope. I'll check the signal on pin...

    I do have a scope. I'll check the signal on pin 4 of the voltage regulator later today and post the results here.

    The area near the IC and the MOSFET gets quite warm after a few minutes and the...
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    Boss OC-3 - CPU/DSP Power Supply issue

    Hi,

    I have a Boss OC-3 Super Octave pedal that has stopped working.

    I suspect that this issue may be related to a doubling of the CPU and DSP supply voltage from 3.3V to 6.8V.

    Here is the...
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    Please disregard any suggestions I made regarding...

    Please disregard any suggestions I made regarding switching the 220 and 1 nF capacitors to achieve a flattened frequency response. The correct way to do this can be found here: SWR Aural Enhancer...
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    Well, according to feedback I received on some...

    Well, according to feedback I received on some other forums, trying to install a push-pull switch to accomplish this will not be easy. However, I did find out how to achieve a flat frequency...
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    SWR Aural Enhancer Bypass

    Does anyone here know how to modify an SWR bass amp in order to achieve a flat frequency response (ie turn the black curve into the yellow one on the graph below)?
    ...
  9. I have been told that in Eden amps, including the...

    I have been told that in Eden amps, including the WT-1205, the tube doesn't provide any gain. Apparently it's being used as an impedance matching device in this circuit (unity gain, cathode follower...
  10. It's a DIP. ...

    It's a DIP.


    http://i18.photobucket.com/albums/b107/139vinny/Eden%20-%20WT1205/WT1205015.jpg

    Cheers,
    Duff2
  11. Eden WT-1205 - trim pot adjustment to increase preamp gain?

    A little history first...

    When Eden first released the 2 channel WT-1205 bass amp, a lot of users complained that there was not enough gain available in the preamp stage, particularly if they...
  12. For those of you following along, trying to...

    For those of you following along, trying to figure this out from only the schematics will very likely end up being a lost cause.

    I went through my WT-400 preamp tonight schematic in hand and found...
  13. Here's the schematic for the WT-400. Have fun!...

    Here's the schematic for the WT-400.

    Have fun!

    Cheers,
    Duff2
  14. Didn't get a chance this morning. Will upload...

    Didn't get a chance this morning. Will upload 'em tonight.

    Cheers,
    Duff2
  15. Here are the schematics for the WT-800. The...

    Here are the schematics for the WT-800. The WT-400 schematics are on my other computer. I'll upload them tomorrow morning.

    Cheers,
    Duff2
  16. I opened up my WT-800 today and found that those...

    I opened up my WT-800 today and found that those four parts are already there. I have also found another version of the WT-800 schematic that included these RC components on the input jack.

    With...
  17. Modifying Preamp Frequency Response - Eden WT-800 to WT-400

    I have recently measured the frequency response curves for my Eden WT-400 (400 watt mono) and Eden WT-800 (2 x 400 watt stereo) bass amps. My ears have always suspected their preamps were voiced a...
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    KB, Thanks for your reply to my question...

    KB,

    Thanks for your reply to my question regarding the transformer. With regards to the E-caps, they have not been changed since the amp was built in 1992, so they may be the source of my...
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    Before I purchased the amplifier, a respected...

    Before I purchased the amplifier, a respected techician went through it, replaced some parts and gave it a clean bill of health. So perhaps the level of hum is inherent in the amp design, assuming...
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    Thanks Enzo. I'll pass along your feedback when...

    Thanks Enzo. I'll pass along your feedback when I talk to my amp guy again.

    For the record, the amount of hum is not affected by any of the control settings nor is it affected by the identity of...
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    The problem I have is with the level of...

    The problem I have is with the level of background hum produced by the amp. It is much louder than I observed with my other Eden amp (WT-400). I had both amps in my possession at one point so I...
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    Hi Amp Kat, My amp is quite different from the...

    Hi Amp Kat,

    My amp is quite different from the current generation of Eden amps. The WT series have a single 12AX7 tube and have a preamp designed by Russ Allee. The amp for which I am seeking...
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    Eden Electronics VT-.40 Bass Amp Schematic Search

    Hi,

    I am searching for schematic diagrams or the service manual for my 1992 vintage Eden Electronics VT-.40 bass amp. This is the 1st generation Eden bass amp with a preamp designed by James...
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