Pedals that stack with the Rarebird effects Transformer Preamp 63

EarthQuaker Devices Chelsea

Where this leans warm, EarthQuaker Devices Chelsea answers back bright

Tech 21 SansAmp

Tech 21 SansAmp's bright balances out the warm tone

IdiotBox Effects End of Line

Keep IdiotBox Effects End of Line after Rarebird effects Transformer Preamp 63 in the signal chain, clear of Rarebird effects Transformer Preamp 63's own gain stage

Roland Corp US LMB-3

Both lean toward warm and bright respectively — close enough in character that they complement instead of clashing

Boss DD-200 Digital Delay

Keep Boss DD-200 Digital Delay after Rarebird effects Transformer Preamp 63 in the signal chain, clear of Rarebird effects Transformer Preamp 63's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Catalinbread Csidman Ghost

Put Catalinbread Csidman Ghost after Rarebird effects Transformer Preamp 63 in the signal chain, clear of Rarebird effects Transformer Preamp 63's own gain stage — goes in the amp's FX loop (or last, into a clean amp)