EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

Jon Ketron
  • Male
  • Lexington, KY
  • United States
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  • mike hadley
  • Joseph W Strickland
  • David C. Poland
  • Norman S Braithwaite
  • Kent King

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Latest Activity

Jon Ketron replied to Leonid Soloviev's discussion Another nice Scott with s/n on Ebay
"Hello, A late 7 knob version complete with Tasman cabinet, good chrome, and without tweeters similar to what you have posted in terms of condition, recently sold for close to $1,500.00 on eBay.  Do you have the Scott cabinet that goes with…"
10 hours ago
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"I want to thank all members who were able to help on this restoration.  This AW-15 has been delivered back to the customer.  He is very thrilled to have the unit playing again. I hope to have another E.H. Scott surface…"
Jul 17
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Thank you Mike for the schematic and further details regarding the testing procedure. Jon"
Jul 10
mike hadley replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Joe; I forgot to include a scope across the cap under test to measure ripple, half wave rectification is used as it gives far more ripple than full wave, this gives a better idea of the internal condition of the cap Mike"
Jul 10
Joseph W Strickland replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Mike; Thanks for that information. It would be nice to combine that with one of the older capacitor testers made in the days of vacuum tubes, such as the ones by Eico and Heathkit with an eye-tube and variable control to measure the capacitance of…"
Jul 10
mike hadley replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Jon; I have attached the method we use for cap testing, it allows for the slow application of dc and the whole thing is current limited by the lamps, there is also the facility to over volt the cap, this is a particular nasty thing to do to the cap…"
Jul 10
Jon Ketron commented on Kent King's blog post Super XII Troubleshooting & Alignment
"Very interesting, thanks for sharing Kent. Jon"
Jul 10
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Joe, Thank you for the comments.  All tuner chassis dog bone resistor's inside this set are still original testing between 10%-20% tolerance.  The only resistors changed were all located within the power supply.  My plan was to…"
Jul 9
Joseph W Strickland replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Jon; Glad you managed to get the unit operational again. You do very neat work. The underside of the chassis looks very nice and neat. Like Mike, I approve of your original appearing resistors. It looks like a well preserved original, except for the…"
Jul 9
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Mike, I am interested in a diagram of the circuit if you get a chance.  Speaking of reception, this entire week between 9AM and 10AM I have been able to pull in Radio China on this customers AW-15, my location is Lexington Kentucky here…"
Jul 9
mike hadley replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Jon, I only performed the test because the caps could be removed from the chassis and I has access to the test equipment, otherwise I would have restuffed. I'm still thinking about replacing the caps as I can easily find some cans to fit and…"
Jul 9
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Mike, I see your reasoning and fully agree.  I didn't realize you performed extensive leakage testing on the tuner electrolytic's.  That is great they still measure good after all these years.  I see why you…"
Jul 9
mike hadley replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Jon; Thanks for the compliment, as you can see I have a little more rust than you do, the damp storage caused the psu transformer to develop a fault, so unfortunately that's not original but under the shroud who would know. Both of the 3uf caps…"
Jul 8
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Mike, Nice work on your AW15 Tuner chassis.  I noticed across both electrolytic's on my tuner chassis, there is a power resistor across both positive terminals.  I know this must be a factory change as the power resistor is of the…"
Jul 8
mike hadley replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Jon; I have attached a before and after photo of the underside of my chassis, only four caps are unstuffed, the two 3uf bolt electrolytics, surprisingly these are still ok after all of these years, and the two bathtubs that are located under the…"
Jul 8
Jon Ketron replied to Jon Ketron's discussion 1934 AW 15 Electrical Restoration, Questions Please
"Mike, The tune is from 1934 and by Clarence Williams.  Fitting music for this machine at the time of brand new purchase.  In the video I utilized an SSTRAN AMT3000 low power transmitter.  It is a great kit and has…"
Jul 7

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