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Hi all , I have a non-gigging Mesa Express 5:25 +and I noticed the clean mode in channel 1 has lost a lot of volume output and crackles a bit when I pick hard on low E string. Channel 2 seems to be unaffected and has plenty of gain and output. I replaced V1 with a Mullard and V2 with a Tung Sol...

Hi all , I have a Mesa Express 5:25 + I plugged in yesterday and I noticed the clean mode in channel 1 has lost a lot of volume and crackles a bit when I pick hard. I am not real knowledgeable about tube amps, but assume it's a bad pre-amp tube as the amp sounds fine in the other channel and...