Recent content by ViperZ

  1. ViperZ

    Tannoy HPD 385A tweeter diaphragm replacement options

    Hi all, I bought a pair of Tannoy Berkeley with HPD 385/A in them, and one tweeter coil was repaired (now it is lower impedance compensated with resistor in series). I would like to replace the diaphragm with a coil, and Lockwood looks like the best replacement avaialble on the market. I also...
  2. ViperZ

    Velodyne ULD-15 subwoofer repair

    Yes, I have the schematic. It is surprisingly complicated for a subwoofer. 2 microcircuits and 3 matched colour-coded transistors in the preamp.
  3. ViperZ

    Velodyne ULD-15 subwoofer repair

    As much as I appreciate this post, sure, point me in the right direction then... I always do enough research on previous posts before making a new thread. This amp has been in my house for close to 20 years, working like a champ after my last repair on it. So yeah, hence my post.
  4. ViperZ

    Velodyne ULD-15 subwoofer repair

    The driver surround was replaced less than 5 years ago. It is not rattling sound, it is an audible hiss/noise - can be heard from about 1-2 feet with no sound playing. The sub itself works fine when sound is applied.
  5. ViperZ

    Velodyne ULD-15 subwoofer repair

    Hi all, I am going through my system repairing minor issues, and finally got to this Velodyne ULD-15 Series II subwoofer amplifier from 1985. I repaired it probably close to 20 years ago and it has worked great every since in my system. Last year I noticed that the subwoofer got a little...
  6. ViperZ

    Replacement Power Switch P227EE2B20A is end-of-life

    Just saw this thread. Checked my stash, I still have a couple of the ones, which are obsolete. These ones should work great, thank you for finding them.
  7. ViperZ

    Rotel RA-1412 strange preamp problem

    Interesting timing. I just picked it up a couple of hours ago. Apparently cause of the issue was an intermittent ceramic capacitor on a power rail for the preamp board.
  8. ViperZ

    Avery's "First" Maker: The TA-800

    Dave, thank you again for taking your time to find and share this circuit. I will hopefully be picking up my TA-800 today, and will start making parts lists and making plans to restore and modify it. Regards, Eugen
  9. ViperZ

    Avery's "First" Maker: The TA-800

    Thank you, Dave. I see 100-Ohm screen stability resistors on the output tubes; 10-Ohm 1% resistors on cathodes. Is there recommendation on wattage for both? Screen stability I guess 1/4-watt will do; would the same work for cathode current sampling ones? For individual bias pots - your schematic...
  10. ViperZ

    Avery's "First" Maker: The TA-800

    Hi all, is there a marked-up schematic available to show where to install and the values of: 1. Screen Stability resistors, 2. Cathode current sampling resistors 3. Individual bias controls I am supposed to pick up a very tired TA-800 soon and it will need a total overhaul. Thank you.
  11. ViperZ

    ADC Accutrac 4000 repair

    Yeah, I read that whole thread. Luckily for me, both my chips, control and memory, are working fine. I wish that guy posted gerber files for PCB along with his code and parts list. Would have been a full replacement package for those with failed controllers.
  12. ViperZ

    ADC Accutrac 4000 repair

    No, I don't have the orb or the remote, and they seem to cost a pretty penny. Yes, there is an adjustment for the tonearm sensor sensitivity level. You will need ADC proprietary mirror insert, or you can improvise.
  13. ViperZ

    ADC Accutrac 4000 repair

    Thank you! I'm trying to source the stylus. The person who was helping me had one, but he is on vacation. I'm in no hurry for now. Spent an hour and a half sanding and polishing the dust cover, glued a crack in the back... it will need another round of polishing later, but looks presentable now...
  14. ViperZ

    ADC Accutrac 4000 repair

    I think I am done. I tried to adjust the run-in position and rest position perfectly, but there is not enough adjustment, since they both use the same mirror. It is not a big deal, as everything works now, arm gets into rest position / cradle, just off from the very end of the hook by ~4mm. I...
  15. ViperZ

    ADC Accutrac 4000 repair

    Thank you, Dave. I love working on unusual or unique gear, have a pretty good collection of it too. I will definitely look at the Optonica table, sounds like fun. (holy cow - a separate arm wand for the sensor was used - https://www.ebay.com/itm/224052239648) Right now I took the whole thing...
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