Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
Thanks for the update. Glad to hear the Electro-Harmonix tube worked out for you.
Did you ever find out if the first tube you bought was bad? I mean, does it test bad, a defective tube, or is the Groove Tube brand just no good in your particular amp?
I have not had the tube tested and may send it in to BOI for giggles if they feel like dissecting the thing.
The original tube in the amp was a Groove Tubes 12AX7 (This may not be Hartke's OEM tube as the bass head was purchased used), the first replacement was a Groove Tubes 12AX7C (Chinese Manufacture) that made the amp go berserk. So far the outcome is pointing to either a bad tube or a bad series of tubes; shame because Groove Tubes touts their QC process as being extremely stringent.
If the new tube holds up for a few weeks, I'll order another as a spare.
Sounds like the Groove Tube. I've had bad luck with Groove Tubes. Noisey and bad sounding stuff for the most part. They were 12AX7's. I know of at least one tube site on the internet that refuses to carry Groove Tubes. They say it's because Groove Tube doesn't actually make tubes, but buys tubes and rebadges them. I can't substantiate that.
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