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Floyd, I’m curious as to the type of capacitor that was replaced. Hallicrafters often used the Cornell Dubilier “Tiny Chief” type in many of their products. These have a pink-0colored

Finally resolved the AVC pumping problem.? As I mentioned, AVC pumping by off-frequency signals occurred only with the selectivity switch in the 2.5 position.? So, looked for what's different with

Hi Don, I think your post 30781 refers to the second image (TEK0007) in my post 30774.? Thanks for your comments on what's going on there.? It seems reasonable.? Unfortunately, the first image in

FYI: Transformer's primary DC resistance 0.616 ohms.? Current sense resistance 0.50 ohms.? There is also wiring, fuse, and a power cord.? Power source is Puget Sound Energy.? Load is the HT-37 at

DonEvidently, you did not understand what was said in my email of August 7th which is in response to your email of August 5th.? In it, you said "current was about in-phase with the voltage",?were

Jim, my reply wording is in green, inserted after your wording in black There is no need to correct anything. If anyone is still following this thread, the point has been made that there is a

In a situation like this, an oscilloscope is your best friend.? Start probing around T8 when exhibiting the problem. Source? should be relatively easy to locate. k6lr??Sent from my Verizon,

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