Great Upgrade for Defender 5h
Upgraded from the stock Chinese tubes. These tubes give a lot more headroom and volume for that matter. Very nice clean and crunchy tones. 12 o'clock on this thing now is getting very loud. I can mostly only play this thing at a 1/4 volume practicing at home before I start pissing people off. Just gives the amp a cleaner, louder and crunchier boost to this 1 knobbed beauty. Great Upgrade for the money.