Forum Replies Created

Viewing 15 posts - 31 through 45 (of 66 total)
  • Author
    Posts
  • in reply to: Two blown fuses in one day #671
    John V
    Participant

      Is the other panel operating properly? If so I would try swapping backplates to try and determine it the issue is with the panel or the backplate.

      in reply to: Two blown fuses in one day #669
      John V
      Participant

        When you turn up the bias can you get to a point where the panel crackles?

        in reply to: Two blown fuses in one day #652
        John V
        Participant

          Was the response to you from Dr. West within the past few days?

          Thx,
          John

          in reply to: Schematics for AU90 transformer modification #646
          John V
          Participant

            Hi lotus123,

            Check out this thread on Audio Asylum. It contains Lew’s comments
            about the AU90 transformer and Will. Lew evidently did not remove the inductor connected to the bass Xformer while Will did. I think you would want to keep the inductor to block the highs from entering the bass transformer.

            https://www.audioasylum.com/cgi/vt.mpl?f=otl&m=35023

            in reply to: Schematics for AU90 transformer modification #627
            John V
            Participant

              Hi lotus123,

              You are the one who purchased the AU90’s from me. And I thought I procrastinated, your as bad as me.;))
              What vintage M854’s do you have? I don’t recall that you owned them at the time you purchased the AU90.

              in reply to: Schematics for AU90 transformer modification #605
              John V
              Participant

                Hi lotus123,

                Here is a copy of am email I received in 2012 showing the brackets made to hold the AU transformers:

                From: David [mailto:dmcclesk@swbell.net]
                Sent: Sunday, August 28, 2011 10:04 AM
                To: ‘acousticsupplies@gmail.com’
                Subject: FW: brackets for tranformers

                Hey Will – Here is the info I sent Lew on subject…Let me know if you have any questions…David

                PS: Make sure when you do the cutouts in plate 3 that you leave enough room on the outside edge for the machine screws. They are right at the edge…

                From: David [mailto:dmcclesk@swbell.net]
                Sent: Thursday, August 18, 2011 6:51 PM
                To: ‘markoffl@yahoo.com’
                Subject: RE: brackets for tranformers

                Hey Lew – Here is a quick sketch of how I made the mounts. All three pieces are ¼” acrylic. The cut outs should be large enough for you to get a nutdriver on the nuts that fasten the mount to the backplate. I can’t replicate them as I would have to take my backplates apart to measure spacing and sizes again, etc…The finished mount is removable. The 4 – 8/32 or 10/32 machine screws should be tightly threaded from the underside of plate 3 to avoid slippage when fastening the transformer nuts…Let me know if you have any questions…There may be a more elegant solution but I was in a hurry when I made them…After the picture (below) of the backplate was taken, I removed the brilliance pot from the circuit and hardwired the transformer connections with Valhalla..only because I had it already from the original backplates.…Also while the 1.5 sledgehammer is still in place I have it switched out. I’ll probably remove it at some point. Let me know if you have any questions…

                David

                —– Forwarded message —–
                From: “Lewis M” <markoffl@yahoo.com>
                Date: Thu, Aug 18, 2011 10:35 am
                Subject: brackets for tranformers
                To: “dmcclesk@swbell.net” <dmcclesk@swbell.net>

                Dear David,

                Is there any chance you can get me a pair of the brackets you made or had made for mounting the 90:1 transformers in the backplate? I would pay all costs, of course. If not, perhaps you can send me a drawing or plan for making them here.

                Lew

                Attachments:
                You must be logged in to view attached files.
                in reply to: Using WiFi Plugs to Power/De-Power Sounlabs #562
                John V
                Participant

                  The plugging/unplugging topic has been beaten to death on pg. 1 and in a number previous posts for that matter.

                  The bias circuit has been generally reliable over the years, panel issues are another story, at least for some pre PX panels, also mentioned on pg. 1.

                  in reply to: Using WiFi Plugs to Power/De-Power Sounlabs #560
                  John V
                  Participant

                    At the end of the day do what makes you feel comfortable, you wanna leave them powered 24/7, do it. You feel more comfortable unplugging/ turning them off when not in use, do it.
                    The one instance when I would certainly unplug them is when severe weather (lighting) is forecast/imminent.

                    BTW, TWB’s comments about pre and post PX panels are accurate, had my share of factory returns due to pre PX panel failures.

                    Now, let me go turn my panels on and listen to some music.;))

                    John

                    in reply to: Using WiFi Plugs to Power/De-Power Sounlabs #553
                    John V
                    Participant

                      Check the older threads, another member uses wireless lamp switches, RF not Wifi, to turn his Majestics On/Off.
                      One example:

                      Might be easier than bending over to flip the switch.

                      John

                      in reply to: Using WiFi Plugs to Power/De-Power Sounlabs #551
                      John V
                      Participant

                        I also unplug my U890’s when not in use. I have a short male-female extension with inline switch (https://www.amazon.com/gp/product/B01HGNN30M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1).

                        As D10 mentioned above, the panels bias up in seconds as per Roger West.

                        in reply to: One SL speaker not working #542
                        John V
                        Participant

                          That’s great, glad to hear it!
                          Been there, done that.

                          I’d much rather feel like an idiot than:

                          1. Have a bad panel/supply that needed to be returned and repaired.

                          or

                          2. Return the panel/supply only to find out there was no problem
                          with either.

                          My rule of thumb, check the simplest most obvious items first
                          even though I think, “NAH, it can’t be that” ;))

                          Enjoy your system!
                          John

                          in reply to: Ticking/Clicking Sound #452
                          John V
                          Participant

                            By your description you could have some dust or other contaminant that is causing a discharge. If so it should subside over time.
                            I’ve had variations of random noises caused by contaminants over the years with the various SL panels I’ve owned. The noise, with no music playing, can take the form of crackling, sizzling, whistling, ticking, etc..
                            At times I have been able to change the characteristic of the noise, or even eliminate it, by standing close to the panel and blowing hard into the area where the noise emanates. You might be able to use “Dust Off” canned air to provide the same effect, just don’t point the nozzle too close to the membrane.
                            The PX panels are very reliable, Roger has mentioned in the past the only issues they’ve had are due to shipping damage.

                            in reply to: No crackling sound #431
                            John V
                            Participant

                              That’s correct, you can see that it is connected to the AC receptacle
                              and line fuse holder. Output of the supply, red wire, plugs into the HV mixer.

                              in reply to: No crackling sound #394
                              John V
                              Participant

                                HI,

                                Correct, directly from the SL factory, speak to Connie and she’ll be able to fix you up.

                                Replacement is not difficult although it does entail soldering a few connections. Take a look at the pix. below, that should give you a pretty good idea. You’ll need to replace the bias control, included with the bias supply, also.

                                John

                                Attachments:
                                You must be logged in to view attached files.
                                in reply to: Pristine II restoration #389
                                John V
                                Participant

                                  AFAIK the brilliance control (L Pad) has a linear taper, but that said, the only way to know for sure is to measure it.
                                  As to mounting the resistor, why not just remove the brilliance control and mount your resistor to the backplate with a screw/washer passed through the controls mounting hole in the backplate? Add some thermal paste for heat transfer and away you go.

                                  John

                                Error on visit counts WordPress › Error