I'm thinking of experimenting with a pair of Quickies and make a couple of mono tape preamps.
My idea is to insert the eq circuit between the two sections of each amp. I will basically build the tape eq section of the Seduction for which I would (from memory as I don't have the schematics in front of me):
Replace the pot in the first section with a 250k trimpot.
Replace the pot in the second section with a 1M resistor.
Between the two stages I will install a a passive equalization network composed of a series resistor R1 of 66Kohms and a series-shunt network composed of a 1.5Kohms for NAB (1.07k for IEC) resistor and .033uF cap.
Use a 0.1 uF coupling capacitor.
The main problem I see is gain since the 6DJ8 has an amplification factor of 33 vs about 5 for the 3S4.
Any comments?
My idea is to insert the eq circuit between the two sections of each amp. I will basically build the tape eq section of the Seduction for which I would (from memory as I don't have the schematics in front of me):
Replace the pot in the first section with a 250k trimpot.
Replace the pot in the second section with a 1M resistor.
Between the two stages I will install a a passive equalization network composed of a series resistor R1 of 66Kohms and a series-shunt network composed of a 1.5Kohms for NAB (1.07k for IEC) resistor and .033uF cap.
Use a 0.1 uF coupling capacitor.
The main problem I see is gain since the 6DJ8 has an amplification factor of 33 vs about 5 for the 3S4.
Any comments?
