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Re: Thanks for suggestions. Any thoughts on

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scarebus

(A)

In Reply to: Re: Thanks for suggestions. Any thoughts on posted by Kamigo on January 20, 2006 at 05:05:20:

DougE,
Per wiring diagram, check C1 and C2 of psu. Do you see
any bulge on the top? Try replace them. How did the voltage
check come out?

Follow Ups:

Re: Thanks for suggestions. Any thoughts on - GTCharlie 17:45:07 01/20/06 (4)
Check the first capacitor immediately after the 5U4 rectifier, before the choke. And if you replaced what came in the box, check value. Say, between 20 something uF up to say 47uF should do very fine. Too much capacitance won't be too healthy for your rectifier in case of surges. Those caps could be also shorted. Second, check the tapping of your primary. You could be getting 110V from your wall, but tapping 100v in your primary. The AN mains is multi-tapped. Hope this helps. Enjoy the weekend
- Re: Thanks for suggestions. Any thoughts on - deankhor@singnet.com.sg 19:05:28 01/20/06 (3)
  I got this same problem a month back. The 5U4G glowed bright blue before fading off, and the 2A slow-blow fuse shorted. I opened up the chassis to find one of the 47uF cap blew. It's been a month since I replaced the fuse/cap....and I am still not sure what to make of the short.
  Hope this helps too. Have a great weekend.
  cheers
  - Is blue light normal ? - Jean-Claude 06:07:35 01/22/06 (0)
    Reading all your recent posts , I am wondering whether BLUE LIGHT in my KIT ONE are normal or not. It started by one 300B ,then the 6SN7 is also showing a blue light. I must add that I had a concenr with the C4 Jensen cap which cooked the R5 resistor...Since then the C4 is not connected anymore.
    Jean-Claude
  - Will check caps and measure voltage - DougE 13:23:17 01/21/06 (1)
    per your suggestions.
    I have rewired the driver board as Chris has, and yes the only blown fuses and rectifier tubes did come after this rewiring. However, I didn't touch the PS or rectifier boards when rewiring so I'm thinking that the only difference would be a surge as has been suggested. Will measure and see what's going on. Will check my winding tap as well. On a related note, the stock 5u4 did spark on turn on even before I rewired the driver board. So, I'm thinking this issue was there from first build. Of course, it could be something I've done since the original build has made it worse!
    As for the soft start, it sounds like the amount of surge that occurs shouldn't blow tubes--is that right? Anyone other than me and Chris blown a rectifier?
    Thanks again,
    Doug
    - Re: Will check caps and measure voltage - scarebus 15:18:41 01/21/06 (0)
      Hi Doug,
      To clarify my incident on blowing the rectifier, the original
      5U4G sparked and blew way before hardwiring the system. I had some
      issues with the Cu caps and a Jensen, cooking R7 on psu. After hardwiring, on initial pwr-up, 5U4G(National tall bottle)
      glowed with blue light without blowing fuse nor cooking any resistors.
      On second pwr-up, with vom hooked to pin 4 or 6, voltage went up to
      around 700 with 5U4G glowing, but no smoke. Left it on, and saw voltage
      dropping gradually to around 200 and slowly came up to 425. And ever
      since, everthing is working fine.

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