"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…"
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
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…"
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…"
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…"
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…"
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…"
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…"
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…"
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…"
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…"
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…"
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…"