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Old 04-04-2009, 09:36 AM   #71 (permalink)
joshuaaewallen
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Re: Preamp Tubes? - Who, What, When, Where, Why, and How? - RCA 12AX7A

Quote:
Originally Posted by solarburnDSL50 View Post
Great posts and I'm soaking it all in. I love to hear how these tubes work in other's amp circuits cause it may be just what I'm looking for or interested in...
I hear ya. That's exactly the type of real world feed back I was hoping for when I started this thread. I comprehend just barely enough to be dangerous, and since I'm not an engineer technical specs are very difficult for me to wrap my thick head around...

Quote:
Originally Posted by solarburnDSL50 View Post
... I tried the JJ ECC83S in my circuit and they were dull and flat and EQ adjustments didn't help. I tried one in my HT Dual pedal as well and got the same result...
So far the only spot that the JJ ECC83S (12AX7) seems to fit nicely in my rig is in V4 my phase inverter... Probably because as the reviewer from The Tube Store noted, "While not as harmonically rich as others I tested, they do provide high gain without the usual noise and microphonic problems you would expect." I think have observed that in my rig when I have the JJ in V4 the amp is quieter with less, if any, hiss, hum, buzz going on in the back ground. It does seem to smooth out the rough edges when placed in that spot. (Of course it could just be the most balanced tube I have and thus work best in V4 for that reason...)

Quote:
Originally Posted by solarburnDSL50 View Post
... I tried the JJ ECC83S in my circuit and they were dull and flat and EQ adjustments didn't help... ... I don't like them with my ears and in my amp. I know quite a few Marshall guys that do. What can ya do but decide for your self...
I agree. I have a JJ Gold pin and a regular JJ, and as I've stated, so far the only place they seem to fit well in my rig is in V4. The other tubes I've been trying just seem to have more layers to the tone, more audible texture (I know that these are pretty poor descriptions, but nothing else seems to fit...) that I can hear.

I'm not sure what frequencies they are bringing out, butthe 12BZ7 & the GE tubes I am running really have a lot of depth and chime. I really think they are my winners for V1 & V2.

So far I am liking, amazingly enough, the Groove Tubes ECC83/7025 12AX7R in V3, and the JJ in V4. I think V3 & V4 are the slots to fill now. I will start playing around with those now and leave V1 & 2 as they are. The trick is for V4 I need a good balanced tube to keep things quiet and what not.

Well... I gotta make like a banana and split. If ya have any other thoughts on this subject, please send 'em my way. Ciao!
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2004 PRS Custom 24 10 Top
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1999 Marshall JCM 2000 TSL 122
- Power Tubes: JJ EL34L's
- Assorted New & Vintage pre-amp tubes... I like to roll...

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