Valve Overdrives Tube Swaps Part 1: B.K. Butler Tube Driver (12AX7 vs. NOS 12AV7) скачать в хорошем качестве

Valve Overdrives Tube Swaps Part 1: B.K. Butler Tube Driver (12AX7 vs. NOS 12AV7)

Welcome to Perky's Analog Gear Demos. Please subscribe for more demos of vintage & rare effects pedals! This is the first of two videos looking at the effect of swapping tubes in valve overdrive pedals. Today, we're going to swap the stock 12AX7 in the B.K. Butler Tube Driver for a NOS (c.1970) Mullard 12AV7 - which only has around 40% of the gain of the AX7. What effect will this have on the tone, gain & output of the pedal? As you'll see, swapping the tube doesn't have a major effect - despite the tube having much less gain. So why is this? Despite being called the 'Tube Driver', this pedal actually creates its overdrive using an Op-Amp rather than driving the tube. The tube is used to colour the sound & add some character, but not really to gain up the signal. So, we only really notice the difference in tube at lower drive settings - here, there's more transients in the signal for the tube to compress. When we slam the drive, the Op-Amp heavily compresses the signal, meaning that the tube is having a minimal effect on the sound. In Part 2, we'll be looking at the Effectrode TD-2A Tube Drive - which uses the tubes & only the tubes to create it's overdrive...so, we're expecting the lower gain tube to have a much greater effect! What do you think? Which tube do you prefer? And why? Comment below! Guitar is a Fender Tele with Bare Knuckle Pickups through a Hughes & Kettner Puretone Combo (recorded with an sE Electronics RNR1 Ribbon) and a Cornell Romany Plus (recorded with a 57) jp@joeperkins.co.uk