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  1. W

    Electrolytic coupling caps >1uf

    Thanks for the link. I kinda suspected WIMAs. The link answered all the questions. Any comments about coupling caps beyond the range of WIMA. What's all of the noise about silk dielectric?
  2. W

    Electrolytic coupling caps >1uf

    I'm thinking it's time to start on my 3300II preamp. I haven't kept up with the audio grade electrolytics. What seems to work at a reasonable cost? Looks like I'll need 2.2uf, 4.7uf, and 22 uf. What are the good film types ? I've got a few hundred polystyrenes. Are they still thee choice...
  3. W

    Sir, I read you're posts concerning the upgrades to the P/L3300. You also mentioned an upgrade...

    Sir, I read you're posts concerning the upgrades to the P/L3300. You also mentioned an upgrade to the 400II. Did you find the documentation for the 400II?
  4. W

    Power stage Phase Linear 400 serie 2

    In my previous message I referred to a PDF that did not get uploaded. Here it is
  5. W

    Power stage Phase Linear 400 serie 2

    When I repair an amp that lights the "dim bulb" test set I check for shorted outputs. After eliminating the bad ones if the bulb still lights up I tie the bases of the predrivers (Q7, Q10) together with a mini grabber clip to eliminate the bias circuit. If the bulb dims there is an open...
  6. W

    Potential WOPL project

    After sleeping on this idea it occurred to me that each channel/module has it's own driver board. Consequently to use one white oak board would get even more messy. The other option would be to use a driver board on each module with half of it unpopulated. Possible, but not very probable. One...
  7. W

    Potential WOPL project

    I recently took a look at a couple Peavey CS 800's for a friend. I'm guessing he bought them for less than a $100 in need of repair. The electrolyic caps had a date code of 1978 indicating they're 40 years old. They've had a hard life and were pretty beat up. They're very heavy with a large...
  8. W

    Phase Linear X20 Crossover

    I have a living room with almost all P/L electronics. "The worlds first WOPL 400II" that Lee did a few years ago is in there along with a 3300 preamp and 5100 tuner. Until last weekend I was running ESS 1A's. I got a little carried away this weekend and took out the Heil diaphragms. 've got...
  9. W

    Clip-On Heatsinks

    Does the original test spec allow for a temporary mod? If not I find it hard to believe that Crown could take exception to it in this manner. Why have a spec if anybody can test their product to suit their own best interests.
  10. W

    PL400 help

    To further clarify, the DC protect board mounts on the binding posts. New binding posts are provided as it can be difficult to reuse the originals.
  11. W

    Mark goes at it again... just bought a PL700/II!

    Just sent the invoice for the board.
  12. W

    Mark goes at it again... just bought a PL700/II!

    I bought one of the import hot air guns that is used for surface mount to do the pem nuts on the back planes. I practiced on a smoked PL14 board before first. It worked pretty good.
  13. W

    PL 3300 Series II rebuild/upgrade

    The purpose of the regulators is to keep the +/- outputs at 15 volts over a wide range of input voltage. The spec (P.3 of the manual) says the range is 90-132 vac. 132 is 10% high from a nominal voltage of 120 volts. 90 volts is 25% low from a nominal 120. Typical power supply design is +/-...
  14. W

    Bad part can come from anywhere

    The 6517 is a high voltage version of the venerable 2N3904. I used it here because it's been used for 40 years to drive an ice cube relay in the inverters at my day job. The DC link voltage on the inverters is as high as 315 volts.
  15. W

    Soldering the pem nuts on back planes

    I've done a few, for other people. You're right though, I'm past due for a 700. I've still got the 400II you did years ago.
  16. W

    Soldering the pem nuts on back planes

    I'm doing one of my own 700B's. The pem nuts on the back plane obviously requires a lot of heat. I found a solution that works pretty good. I bought one of the hot air guns on Amazon (and paid the $2.49 for a 4 year warranty). It did a very good job with some patience. Temperature was 410C...
  17. W

    My PL700B by Marco

    Looking at the marks on the case and the 1979 datecode the one in the pic is a pull. Buyer beware.
  18. W

    Bad part can come from anywhere

    I ran into this some time ago. The transistors sat around for several months until I needed them. At that point it was too late to return them. I tossed them in the trash.
  19. W

    Dynaco C-100 Energy Storage System (Capacitor Bank)

    I met with John last Wednesday at the local burger joint. The C-100 came about late in the history of Dynaco. It is believed there were less than 1000 of them built. The folks at the factory were leery of them due to the stored energy in all of the caps. In addition, all of that stored...
  20. W

    Dynaco C-100 Energy Storage System (Capacitor Bank)

    There is a potential issue I can see. Can you post a schematic of your plan?
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