Hi folks,
I recently scored a Pilot FA-540 on eBay. The one I received was from a console. But the models sold usually is the non-console type. So, while going through the circuit from the service manual I noticed that the original FA-540 had a "LEVEL SET" pot tuner and a 12AU7 circuit. But in the console unit I received the 12AU7 circuit is missing. What is the specific use of the 12AU7 circuit? Is it necessary to add it?
I've attached a picture of the unit I've received. I've also attached the schematics for a better understanding along with picture of the non console unit from an eBay ad (https://www.ebay.com/itm/Audiophile...h=item4b5947ee14:g:1LwAAOSwLr1cIYIT:rk:6:pf:0) to show the tube and the level set.
Thanks in advance.
I recently scored a Pilot FA-540 on eBay. The one I received was from a console. But the models sold usually is the non-console type. So, while going through the circuit from the service manual I noticed that the original FA-540 had a "LEVEL SET" pot tuner and a 12AU7 circuit. But in the console unit I received the 12AU7 circuit is missing. What is the specific use of the 12AU7 circuit? Is it necessary to add it?
I've attached a picture of the unit I've received. I've also attached the schematics for a better understanding along with picture of the non console unit from an eBay ad (https://www.ebay.com/itm/Audiophile...h=item4b5947ee14:g:1LwAAOSwLr1cIYIT:rk:6:pf:0) to show the tube and the level set.
Thanks in advance.
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