Hi Jeff, What you have is a ferro-resonant transformer. That was used quite extensively in battery chargers for the marine industry. It provides a fairly good regulation with wide variations in load
Hi Carl, Yes they are probably going bad. The shiny spots are the start of holes being burned in the plates. 811s should never be run with any color at all. Also I think that amp has only 3 tubes? If
Hi Carlos, If you are getting your power from a 3 phase line, and you have 120 volts then there should be only 208 volts across the two phases. I ran into that problem at a military installation I wa
If you have a standard delta connection then you will only have one voltage available. Without other transformers of course. With a 3 phase wye connection (which I assumed that it is if you have two
I think there is a description of the tank circuit in the manual? If not try the manual for the 100V or 200V. They have the same type of circuit in the tanks. They are quite complex as to their opera
3rd order distortion is usually quite a bit higher than 5th or higher levels. 3rd order products are usually the ones that cause the most problems, so are the ones looked at most. Remember that 3rd o
CORRECTION: (I should be awake when writing). The above would be true if IM happened in the audio section but not if in the RF section. That should be 2A -B = C. The 2A + B products fall well outside
Hi Ian, The problem with peak hold analyses is that a particular peak only has to hit once and it becomes the same class of data as a frequency that is almost constantly present. It will tell you all
Spectrum analyzers that have peak hold often have different means of averaging also. Actually your 141 kind of averages when using the long persistence. It can be done several ways. I am still not su
Hi Tom, If IM products are generated at RF (after filters) I don't think that there is a difference. Each signal should modulate the other equally. If some of the products are being generated at lowe
Hi Tom, I agree that higher order products may have little to do with low order products. My point is that in most transmitters if there are severe or harmful high order products present there are al
Hi Tom, I think you are right about the levels of upper and lower products having the capability of being non-symmetric. I remember reading in Termans handbook about mixers that says that the "strong
They were used in the commercial two way radio sales business. I think EF Johnson came out with them supplying their dealers. It was a handy item for them to take to a customer to show how much power
Are you telling me that a signal that is causing splatter out 10 to 20 kc or even 100 kc is going to be clean on the opposite side band? Please reread the first sentence of post. 73 Gary K4FMX
If products can be heard 6-20 khz away you can almost bet that abnormal trash can be heard on the opposite side band. I am not advocating that listening on the opposite side band be the ONLY test don
-- Reminds me of the story of the kid that sees a huge pile of horse crap in his back yard one morning. He runs and gets a shovel and starts digging. When asked what he was doing he replied "with all
Shall we burn all the books that have reference to amplifier building too? As their venom filled NO. 73 Gary K4FMX ______________________________________________