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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: I suggest caution when upgrading some amps posted by JohnL on March 29, 2010 at 19:14:54:
Huh?
If you had had your Jadis worked on and didin't like the result, then you would have something to say, and I would support you saying it. But as all you got was some promo, how can you make any intelligent comment on Joe's work?
The Jadis may, or may not , sound great, but theoretically they are all flawed from a technical point of view - using a low gain high current tube (ECC82/12AU7) as the input tube, and a low current high gain tube (ECC83/12AX7) as the driver tube for the output tubes.
The 12AX7 has no chance of correctly driving even the EL34 tubes in your amp - let alone the string of KT88s in their larger models. This results is quite some frequency roll off in the high end, which is easily corrected by simply exchanging these two tube types, and a few associated resistors.
I don't argue you being happy with the Jadis, but not everyone is.
Regards, Allen
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Follow Ups
- RE: I suggest caution when upgrading some amps - Allen Wright 03/30/1003:26:34 03/30/10 (2)
- RE: I suggest caution when upgrading some amps - I sort of agree... - Joe Rasmussen 23:31:58 03/30/10 (0)
- Since you raise the issue... - JohnL 04:49:23 03/30/10 (0)
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