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  1. W

    Control board

    I've seen the 7.5k/2W resistor, that Ed mentions, fail several times. I automatically replace it. C111 (100uf/6.3v) fails frequently. C101 (47uf/100v) faills less frequently. I've seen C304 (4.7uf/35V) on the display board fail a lot. The same cap is used elsewhere on the board, but doesn't...
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    Oscilloscopes - Questions, Comments and WTF?

    Ed, I bought the TS1 around 1983 and it’s served me well. I added a synk output on the back of it You can’t beat being able to cover 2o -20 kHz with one controll. When I bought this it came with the book. I’m tied up for the next 10 days or so. At first chance I’ll get the book scanned...
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    Oscilloscopes - Questions, Comments and WTF?

    Mark does a fine job of detailing the setup. Referring to the trigger, most signal generators have a trigger output. This is the same signal as the output that is taken before the level control. I connect it to the external trigger input on the scope and set the scope's trigger switch to...
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    Does Anyone Have Any BNC Cables or Connectors?

    I tried the foreign equivalence a couple times. Wasn’t even close to being the same as the Pomona’s. I found some good deals on multiple purchases on eBay a few times They were in the $2.50 range each l For testing amplifiers, having cables terminated with the MDPs make it Really nice. I...
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    Does Anyone Have Any BNC Cables or Connectors?

    I've got a variety of BNC cables and adaptors. The scope in my rack has dual BNC to female binding post adaptors. All of my audio cables are fitted with Pomona MDP's on one end so they plug into the scope. I rarely use scope probes except for signal tracing. I recently worked on an...
  6. W

    Anyone have experience and opinions...

    Depending on your application, the Rigol DS1054Z is a 4 channel/50Mhz scope for $350. They can be cracked to make it a 100Mhz. The trace is fatter than my analog scopes but for capturing waveforms at audio frequencies it's hard to beat. My company has a dozen or so In R&D and no complaints.
  7. W

    Converting WOPL inputs to XLR...

    Although the Clenboxpro may solve the problem $69 probably doesn't get you audio grade components throughout. The advantage of XLR's is a balanced output that is less immune to noise. If noise is not an issue then one of the pins can be tied to ground resulting in a single ended output...
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    Converting WOPL inputs to XLR...

    SESCOM xfmr I use 1/4 phone jacks on my amps. Switchcraft 1/4 jack, insulated
  9. W

    Converting WOPL inputs to XLR...

    Here's a thought. If you want to run an amp bridged for mono output, the +/- signal of the XLR covers the bases. Radio Shack used to sell an XLR to 1/4" adaptor that used a miniature transformer. I have no idea what the frequency response was. Also, i think it was for microphones and line...
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    FWIW, I'm in N.E. Columbus. If you head this way let me know. There are a couple of us here...

    FWIW, I'm in N.E. Columbus. If you head this way let me know. There are a couple of us here. I travel a lot for work. Email me at d3imlay@gmail.com.
  11. W

    Toasted 400 still toast

    Roccus sent me the old transistors. The leads were less than 1/32" long so I had to solder on extensions. This would be a challenge on a good day, let alone the day after 10 hours of NCAA tournament games at the pub. I could not attach a lead to the one on the left so only two of the three...
  12. W

    Watts Abundant web site off line

    Nice! More incentive to get off my duff and do something. Thanks.
  13. W

    Watts Abundant web site off line

    It came to my attention that my primitive web site had gone offline. The host, Earthlink, acknowledged "they had some trouble". They got it fixed, but search results for watts abundant no longer finds the page. Until that gets fixed if anyone needs info on my relay boards here is the link...
  14. W

    Sansui monster

    The hack job I was referring to was covering up the Marantz name and model number with a piece of sheet metal. Cheap? Not these days, especially with the cabinet.
  15. W

    Sansui monster

    While watching a basketball game tonight, a commercial came on with this insult. Who would have the audacity to do a hack job on such a classic?
  16. W

    Toasted 400 still toast

    So the smoking gun appears to be the three transistors. Were they tossed in the trashcan? If they are still lying around I’d like to get a hold of them and check them on a curve tracer and post the results.
  17. W

    Is My Weller WES50 Iron Dying

    Tighten the tip. Loose tip happened to me last week on a similar iron.
  18. W

    So, here I go. Phase Linear 400

    The only benefit to silpads is electrical isolation which the MJF15030 providees. My testing indicated thermal tracking was not an issue. What I really like is the improved reliability of the TO220 leads.
  19. W

    So, here I go. Phase Linear 400

    I've successfully used Onsemi MJF15030's for the Q6 transistors in the bias circuit. The nice thing with this transistor is it's a TO220 in an isolated tab. It mounts perfect on stock amps. There is an added benefit. The fans typically found on computer cases have a connector with the same...
  20. 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?
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