diy IF transformers: first attempt.

[regenfreak]

I would like also to build an all triode superhet, something like the front end of the Grundig 80U, (I have an example), a  cascode IF, an Infinite impedance detector, AF amp, self split PP output. That's a possibility from currently available new production components: China production of 12AT7 are easily capable of 120MHz+ use, and in "new old stock" land, 7AT7 are relatively plentiful here and are not it seems attracting much attention of audiophools, or guitarists tube rollers.... yet.

Hi Amie
I have not logged on since Feb. I was so bad that I forgot the name of this forum. 

  In my early days, I started off building a minimalist MW superhet with only a single IF stage (somewhat deaf)  using a chain of cheap 9V batteries like yours. 

12AT7 is a good choice for oscillator. It is similar to ECC85 used in FM superhet. The 12AT7  was used in the Heathkit RF-1 signal generator kit, schematic here:

https://www.vintage-radio.info/heathkit

I was building my FM superhet tuner but encountered problem using ECC85 as an oscillator:

https://www.vintage-radio.net/forum/show...p?t=178722

I could not understand why the oscillatior output was so weak in spite of repeated experiments with different coils, feedback tappings etc. However I got the tracking perfect though. I built a minimalist FM superhet tuner with a 6SB7(RF , mixer and oscillator all in one). It works very well. To investigate the problem with ECC85, I will build an oscillator test rig so that i can isolate other factors like components interaction etc.  I have a pair of cheap Russian transmitter values 6C11 (EC81) from Aliexpress. They are good up to 750MHz. I am going to test against the ECC85. The 6C11 works really well as an oscillator in my chinese stereo FM kit. I have been doing other homebrew projects at the moment. So it will be my another "to do list" 

Happy experimentation!

Welcome! I've seen your posts on UKVRR

Good to see you here. Thank you