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I bought this amp in 2007 , and haven't played it a lot (It was my band amp) , and i have never try to break-up this earthquake machine :lol: but today , i shunt my Normal input with bright input , turn both input volume to max , and play one chord with the master at noon... loud , it was... loud :l...

I open my amp again , and i put some Groove tubes GT12AX7M in V1 V2 and V5 , and i haven't heard a big change in my sound... It's very strange because when i put my guitar into the normal channel 'Hi' input , Input volume at noon , and master volume at 9'o clock , my guitar sound is practically inau...

Hi ,

I'll check all of these solution , but i'm on a very nice pair of blue TESLA EL34 NOS(1937) ,so i must wait a little more

Thank's for all of these answer ! So let me explain why i want to replace all of my valves. My mullard in V4 died , and when i turn the "Normal volume" knob to maximum , i have no crunch/overdrive , and i'm in the "hi" input of my Hiwatt , do you think that's normal ? And another...

Hi , I have a vintage Hiwatt DR504 (1976) that needs new valves.. My actual tubes are : -2 Sylvania EL34 "Fat boy" -Raeython 12AX7 in V1 -Mullard 12AX7 & 12AT7 in V2 , PI , V4. I need some advices for the power tubes , some people think that if you're putting vintage NOS(Matched pair) ...