Recently acquired a stealth Gt50. I am not knew to tube amps but this amp just rocks! However lately, channel Two has been lower and fading down in volume. Last night channel 1 decided to knock out after a little while of playing. I ordered new power tubes for her(6v6), but I've read the caps take a beaten too. I pulled the amp out and found 4 caps ( 450v 47uf), 4 caps (450v 100uf) and 2 caps (35v 1000uf). Never replaced caps before but have worked on pc boards at work on occasion. Should I replace all the Caps all 10? or is there a way of testing it and determining which need replacement. Thoughts, advice would be beneficial. Thank you for reading my post.