UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Adding a selectable line input to valve radiogram

Edward Huggins · 20th Nov 2020, 4:43 pm

Ah, I now see the OP is not using the word "Bias" in the electronic sense, but in the literal sense. It's a rather esoteric way of explaining an electronic characteristic!
Again, all my 60 years experience of the theory of crystal/ceramic cartridges working into a high-impedence input (c.1 meg ohm load) tell me that no form of EQ adjustment is needed - it is performed by the inherent piezo/mechanical virtues of the cartridge per se.
So why do these Posts seem to wander off into attempting to change these inherent characteristics by some form of variable EQ/Gain? I just don't get it. HELP!

20th Nov 2020, 4:43 pm	#136
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,328	Re: Adding a selectable line input to valve radiogram Ah, I now see the OP is not using the word "Bias" in the electronic sense, but in the literal sense. It's a rather esoteric way of explaining an electronic characteristic! Again, all my 60 years experience of the theory of crystal/ceramic cartridges working into a high-impedence input (c.1 meg ohm load) tell me that no form of EQ adjustment is needed - it is performed by the inherent piezo/mechanical virtues of the cartridge per se. So why do these Posts seem to wander off into attempting to change these inherent characteristics by some form of variable EQ/Gain? I just don't get it. HELP! __________________ Edward. Last edited by Edward Huggins; 20th Nov 2020 at 5:04 pm. Reason: typo