The “Honeymoon” Twin

owner picked up this pre master-voloume SF Twin for a fair bit of coin, complained of poor tone, etc … was supposed to be Blackfaced but wasn’t / plus there was orange drops throughout – and circuit was very hummy

further inspection revealed a Bias circuit that was badly modded and way out of range / leaving the power tubes super cold at full rotation … vintage Fender Blue Foil caps were inserted in the Reverb channel signal path and tone circuits along with a NOS 0.001u/400v Mullard cap going into the PI circuit for a characteristic vintage feel

the rest of the circuit had a lead-dress hair-cut along with moving the trem-defeat line to reduce hum down to nil … a proper Bias circuit later and the amp was purring as it shoulda in the first place … sounding very AB763

Leave a Reply

Your email address will not be published. Required fields are marked *


This site uses Akismet to reduce spam. Learn how your comment data is processed.