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HaldenYou can't have it both ways, either you are measuring a reactance with a 90 degree phase difference between E&I or you are measuring a resistance with E&I in phase.? A reactance does not behave

A rainy day here and thought I'd dig into the SX-117 again and investigate the AVC pumping situation that's been discussed in the past.? For those not familiar with the problem, the symptom is that

Halden good that you are still testing, here is how I see the images. The second one seems to show turn on at voltage negative peak, very small fast transient in voltage when switch closes. no

Here's an interpretation of the surge according to the theory that it represents the transformer core reaching saturation. In image #49, which shows the strong surge, one can see that the current

Hi Jim, All conditions are the same in the third image (#58) except that the previous time the unit was turned off, the last cycle had negative polarity as shown in image #56, below.? Per the

HaldenThe second o'scope image is exactly what I would expect to see from an SSR switch at turn on.? At the voltage zero crossing, the current is always at a maximum with voltage leading the current

When I started collecting in 1975, I spent as much time tracking down Rider's manuals as I did searching for radios. This was long before the 'Net, so hard-copy manuals were essential.? Times have

That would be more convenient than the paper set I have :). I think 14 is the volume with most of the ham gear. John [email protected]> wrote:

(2nd post this evening) This image shows the profile of primary current starting with a peak a little more than 4 A and decaying over about 4 seconds to about 1.6A as the filaments warm up.? In this

Another update... I hauled by HT-37 to the dual-trace storage scope and inserted a 0.5 ohm resistor into the neutral side of the power supply.? Here's a little bit about what I found. When the surges

The files are also posted here: http://www.nostalgiaair.org/Resources/ Same stuff but also the Index to locate which volume to find what you are looking

Mis spelled Rider, sorry. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

Ryder published manuals for nearly anything a repair shop might run into. They redrew schematics to make them uniform. There were a couple of other pubishers of service data but I think Ryder was

I just received a DVD I bought on FleaBay that contains volumes 1-23 of the Riders Manuals.? I scanned through a little of it and found pages of radios I've never even heard of! 73, -- Justin

Joe, Yes it was. The primary on the original had failed open. A Stancor A-4723 was also suggested by Jim Whartenby, but I found that difficult to source in the UK. It was possible to obtain from the

DonI was responding to what you said which is at the very bottom of this email."Anyhow, Halden’s current was about in-phase with the voltage [ I copied and shifted the current which is not perfectly

Hi Jim, You are right about needing to get into the nitty-gritty! I don’t understand why you wrote all this, but it’s good to learn more, thanks. but at the end you said: “If you can find a

Thanks, Jim. ????????? ? Joe Connor

Yes, see message # 30485"Further investigation revealed that the primary of transformer T5 is open."Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

I want to make sure I understand this. Was the Hammond 124A used to replace the interstage transformer?? ? ? ? ? ? ? ? ? ? ? ? ?Joe Connor