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Post by dickieg on Feb 27, 2006 10:17:13 GMT -7
I just got a set of 7025s and understand that they are fantastic and rare preamp tubes. Would they be good in my Max JR and where should I try them? On the chart, the only slots for 12ax7s are V4 and V5 - was wondering about using the 7025s in V1 or V2 - (chart indicates ECC83S) I'm new to swapping tubes and don't understand anything about how they work, so I'd really appreciate some guidance. Thanks PS- if they're not right for the Dr Z, I do know where they would go in my Twin Reverb, but I'd prefer to invest in the Z.
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Post by Seńor Verde on Feb 27, 2006 19:49:59 GMT -7
The 7025 is a military version of 12ax7, just more rugged and tighter tolerance. The European version is ECC83. They are all interchangable and will work in the amp. Try them in the V-1 and/or V-2 slots. You can try them in the V-4 and/or V-5 slots as well.
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Post by dickieg on Feb 27, 2006 22:16:58 GMT -7
What are the differences? Would the ECC83 sound different than a 12ax7? Is it purely preference? Why does Dr Z use the ECC83? Also, what are the differences between v1 and v2? I'm really a novice in the back of these amps - for years I just paid attention to the knobs on the front! Now I read a lot in the forums about tube switching and I'd sure like to know a bit more about the logic. Thanks DickieG
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Post by Seńor Verde on Feb 28, 2006 19:45:12 GMT -7
The sound difference is not just between ECC83, 12AX7 and 7025. Even trying 12AX7, or any kind of tube, from different manufacturers will sound different. Sovtek makes at least 3 different 12AX7's and they all sound different too.
I think Dr. Z calls for ECC83 in the V1 and V2 slots because the GT and JJ (which is the stock tube for those positions) are labeled as ECC83. The other V4 and V5 slots use tubes called 12AX7 from their manufacturer, which is Sovtek.
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