Ive realized what i truly need now is to simple add an rf stage to my home brew.

I happen to have a few good testing 201a tubes and since the voltage and filament seem to be in range of eachother, i think it would work.

So if i understand this correctly, i can copy the audio half of my single type 30 regen receiver with a 201a and then have an rf stage?, allowing me to use a small speaker?

Having built a few tube and transistor regens, I would say that trying a new design is a learning experience. There are so many variables of components, antennas, layout, etc. that it's hard to predict the performance "gains" of a new design. Typically, I end up building each design 2 or more times. The first one is a "breadboard" to get the general concept working, then another with "refinements" (things I learned building the first one).

It seems that you are looking to add an audio stage. I don't think you will see much performance improvement. I have a small audio amp on my bench that I use as a signal tracer. If I hook it to a one-tube breadboard, I have a pretty good idea of what an additional audio stage might buy me.

I guess I would explore adding an RF stage, or going to a pentode instead of a triode and controlling regen with a pot on the screen grid.

Anyhow... it's fun!

Rich

Here is a nice design that's been around since the mid-50s and uses easy-to-get tubes:



It's called the "Novice Special" and lots of reference available on the internet and in old QST magazines.

Rich

The two tube Hikers set and the Doerle sets come to mind.


http://www.philcorepairbench.com/doerle.htm

Doug

I suppose I should just be looking at adding an RF stage and not a total redesign. Though I am going to attempt to add the variocoupler into this and add taps, to hopefully add some sensitivity.

Ive a few good testing 201a tubes. I read that its an amplifier and receiver triode. Would this give me enough gain to run a small speaker? That is if its running off the minimum 45vdc that im running my type 30 on.

The 201a seems ideal as the plate voltages and filament are comparable and do overlap in the operating voltages.

So i suppose im just looking for a good single tube rf stage that i can rework to use one of the 201a tubes now. The Doerle looks like the rf stage can be copied easily, but it calls for a transformer, something ive yet to use.

Hello Guys,
Nice circuit design