I have the Amprex gold pin, SQ, PQ’s all seem brighter in my system than the bugle boy. Valvo’s are mellower, Orange globe are brighter than white lablel amprex gold pin SQ,PQ. Bugle Boy can be a Goldilocks tube sometimes.
if your preamp takes multiple 6922’s I mix and match maybe a Valvo and a PQ the Valvo can tame the PQ and give it nice balance if I’m using a silver cable.
Please confirm this with Brent my findings may be personal but the bugle boy has always been on of my favorites for there price and performance.
My amp came with the russsian gold lion gold pins 6922 there okay but lack in sound stage and can be a little bright they remind me of Telefunkens but lacking. They sounded nice at first but spending a little time with them their faults become apparent.