UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - An all tubes FM tuner with permeability tuning device.

Osvaldo LW1DSE · 8th Feb 2022, 4:37 pm

This is the idea borrowed, but in my case the coils will be in line for mixer grid coupling, except the antenna coil.

The RF amplifier will be a ECC88 or ECC189 cascoded and the mixer & oscillator, a ECF801. FI will be 12MHz and the tubes selected for it are EF184's. Detector is a 6AL5 but unsure the configuration (Foster Seeley or ratio detector).

Please note that its ugly appearance is obvious, but will be corrected after prototyping.

8th Feb 2022, 4:37 pm	#3
Osvaldo LW1DSE Tetrode Join Date: Jan 2022 Location: Barrio Garay, Almirante G. Brown, Buenos Aires, Argentina Posts: 76	Re: An all tubes FM tuner with permeability tuning device. This is the idea borrowed, but in my case the coils will be in line for mixer grid coupling, except the antenna coil. The RF amplifier will be a ECC88 or ECC189 cascoded and the mixer & oscillator, a ECF801. FI will be 12MHz and the tubes selected for it are EF184's. Detector is a 6AL5 but unsure the configuration (Foster Seeley or ratio detector). Please note that its ugly appearance is obvious, but will be corrected after prototyping. Attached Thumbnails __________________ Enjoying high heel sandals, shoes or boots when I can. Last edited by Osvaldo LW1DSE; 8th Feb 2022 at 4:41 pm. Reason: Typos :-(