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Yes, the tone control switch disables AVC when set to "C.W." I prefer the independence of control that the S-40B provides. But one advantage of the 8R-40 might be the open switch contact on the tone

Hi Don, It's abundantly clear to me that your comments are meant to contribute to the conversation and to my progress in understanding how all this works.? Hopefully a few spectators are learning

I opened up the transformer to see if I might be able to repair it.? So far, it appears to have been wound as Jim described: Primary first HV secondary 2nd Filament windings last.? I haven't peeled

I have also read that some of the artificial sweeteners cause gastric problems.? In any of the drinks I make I use either Stevia or Monk Fruit extract. Justin B. - KI5GKD

Not much. I don't drink much soda of any sort and don't use lo-cal sweeteners (or sugar for that matter). I don't think I can blame my bad memory on that. Curiously my memory is very good for some

HaldenYou said: "By transitivity, then, primary current and primary voltage are in phase with each other." No, this violates all that is known about inductors and coupled inductors aka transformers.?

DonThere is no difference between two inductors and a transformer if the two inductors are coupled together only by a common magnetic field.? The tighter the coupling between the two inductors, the

Hi Richard, Do you drink ANYTHING with Aspartame? The non-caloric sweetener? It's found in many Diet Soft Drinks and in table packets (Brand name Nutrasweet and Equal). I was having issues exactly

Hi Jim, The purpose of monitoring primary current is to understand how the transformer's operation affects the power source.? The purpose of monitoring secondary voltage is to understand how the

Hi jim I think many and me/I would agree with paragraph 2, and 3, but on pgf 1, with all due respect, this is a transformer, and it has some resistive load which is reflected to the primary as-in

Hi Robert, I think your statement "none of your measurements or assumptions can be correct" is an exaggeration at best.? The oscilloscope has not been calibrated for years, but that does not mean its

Robert, Halden , and all , at the risk of “”“massively exceeding my bandwidth””” and being ousted !! Robert, yes, I agree, and I think this was understood, as Halden said he did not want

HaldenAnd that is the problem, there should be a phase difference between the two if you measure voltage and current in the same winding.? Measuring current in the primary and voltage in the

I have to look at the 8R-40, does the control turn off the AVC when the BFO is operating? Does not on any of the S-20R/S-40 series. The HQ-120-X and its successors are wired that way, manual RF

RE Don, I think you were onto something. Halden, you have gone to a lot of work for us—thanks! It takes me a lot of time to digest all this! so I can’t just bounce it back. I have inserted

Run 1 of the 8R-40 used the same tone control arrangement as run 2. I have an example of the first run and the main difference is that run 1 used a selenium rectifier in the power supply and a

One interesting difference between the S-40B and the 8R-40 is the use of the tone control to control tone, BFO, and AVC. These are all separately controlled in the S-40B. When the control is set to

Halden, I understand that you are not running this transformer at rated input voltage. Have you not considered that you do not have the design rated magnetic field being generated and therefore,

Hi Jim, No, I haven't crushed that resistor to inspect it nor measured its inductance. I have attached a screenshot that shows that there is very little phase difference between primary current and

HaldenYour current sensing resistor is 1 ohm?? How many turns of wire do you think make up this resistance?? Film resistors can also have a spiral cut to trim resistance but it's inductance is