Ooops, sorry....Mitch is also correct in that there are three stages (steps) in the alignment procedure in radios having three IF transformers.

I think English may be Huesby's second language so perhaps some social skills were lost in translation.

Please let's end the discussion about IF stages and talk about what else makes some radios so hot.

Dave

What about those novelty radios shaped like scantily-clad girls with the controls in compromising places? Anybody think that those are "hot?"

OK, that's wrong. In many ways.
Go ahead, Dave. I deserve it.
So wrong..

Dave Doughty

Sorry for having offended some folks with my word NONSENSE, could you suggest me a more polite word to mean the same ?

By the way I agree with you:
but there are 1 Mixer Transistor (which amplify), and 2 IF amplifier Transistors in that radio do you agree ?

Nonsense means "silliness" or even "foolishness."

In my opinion, I am the only one guilty of nonsense in this thread.

If you really wish to be sensitive about others' feelings, maybe a fair way to say it would be "I have to disagree with the thought that..".
That's one thing that I just do not come by naturally - social skills. I have learned them the hard way.

Absolutely!

There is a Mixer/Oscillator stage (sometimes known as a Converter when the mixer and oscillator functions are combined into one active device and it's associated cicuitry) and then there are 2 IF stages. The Channel Master 6515 under discussion also has an RF stage ahead of the Converter stage and a diode Detector stage following the 2nd IF stage. There is an Audio Preamp stage followed by an Audio Driver stage which sends it's signal to the push-pull Power Output stage. At least that's how I interpret the schematic. Others might see this differently.

Having a tuned RF amplifier stage ahead of the Converter is usually what makes for a hot radio, whether it uses transistors or tubes.

Dave

Thank you I really appreciate the English lesson.



Then case is closed !...

To everybody else:
Sorry folks, excuse my poor English, for my english studies I never been in the USA for more than a month and the rest I´ve learned watching movies and reading on the internet.

You should be proud, for, you are doing quite well at English. Better than some of us who were born as Americans. Many of us (Americans) could also take a lesson from most of the rest of the world and learn to communicate multi-lingually.

I thought the "nonsense" remark was kinda cute, myself; sorta like shooting from the hip and saying just how one feels.

But then I have thick skin. Hell, on this forum you sometimes need it, he he.

You're good in my book, Huesby! What country do you hail from, BTW?

Good to know Fifties, I´m your neighbor....Greetings from Veracruz, Mexico from an Arab/Mexican guy who still makes his living fixing and selling electronics devices like TV, Audio, Computers, appliances and such.

That's a tough way to make a living. Most of us lose money just doing it for fun!
It's good to know that there are still places left in the world where things aren't just thrown away when they need service.

I have that model (Hoffman Solar) and have not noticed that it is particularly sensitive.
But I have an early 1970"s vintage Channel Master with virtually the same circuit (No RF stage, two IF stages) that is really hot. It has a long ferrite rod antenna, which must be helpful, but I think the mixer transistor must be extra hot, along with other variables as have been brought up? I actually modded it, back in the day, by tacking on an extra IF strip after the existing one (ala 100xer or Q5er) , and it made it even hotter on AM BCB.

As I stated in an earlier post, I have 2 of the same model radio; one is hot and the other is "normal". Also stated in another post, I found some major differences in the AGC voltages between the 2, but haven't yet attempted to dig into the normal radio any deeper. I've been down here in Jaco, Costa Rica since last week, enjoying the sun, beaches and deep sea fishing!

-Matt

Hey, stop in and say hi to Lee and Dianne. 5 K Norte' de la eglisia blanco. Coffee growers and very dear friends of mine whom I haven't seen since just shortly before my youngest son was born (on Leap Day 2000!). If you have time and queres coffee le gusta!
Jeremy

Awe! I wish I would have written about our visit there sooner. Traveling back home now. Costa Rica is a beautiful place! I'm seriously considering buying a condo in Jaco - Las Palmas. Property owners can buy CD's in Costa Rica that pay 7.65%!

Thanks Jeremy! I'll look them up when we go back later this year.

-Matt