UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

John M0GLN · 13th Sep 2017, 1:33 pm

One of my sets is a RCA Victor 45X11, I have just changed a few caps' and it's working well, but there is one thing that puzzles me with regard to the valve descriptions on the schematic, the 12SA7 which is a heptode mixer-oscillator is shown as a '1st DET-OSC' and the 12SQ7 which will be doing the detecting is shown as the '2nd DET-AF-AVC'. what does DET stand for with regards to the 12SA7? I've looked on the web but other than finding out that it's a common description in US radios I've seen nothing else, I expect it will be something simple and obvious to all but me.

Thanks

John

13th Sep 2017, 1:33 pm	#1
John M0GLN Octode Join Date: Jan 2004 Location: Southport, Merseyside, UK. Posts: 1,156	RCA 45X11 valve description. One of my sets is a RCA Victor 45X11, I have just changed a few caps' and it's working well, but there is one thing that puzzles me with regard to the valve descriptions on the schematic, the 12SA7 which is a heptode mixer-oscillator is shown as a '1st DET-OSC' and the 12SQ7 which will be doing the detecting is shown as the '2nd DET-AF-AVC'. what does DET stand for with regards to the 12SA7? I've looked on the web but other than finding out that it's a common description in US radios I've seen nothing else, I expect it will be something simple and obvious to all but me. Thanks John Attached Thumbnails