What will 3 12au7s sound like?
Moderator: VelvetGeorge
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What will 3 12au7s sound like?
Hi guys. Just wondering what 3 12au7s will sound like in a jtm45 with el34 power tubes, and a gz34 rectifier tube? Will it sound like crap? I won 2 sets of these tubes(12au7) on ebay which are supposed to be vintage.....one set from 59 and the other from 60......sorry for the dumb question, I'm just new to amp building and want my amp to sound good. Thanks to any replies.
- neikeel
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Re: What will 3 12au7s sound like?
Pretty low gain
12AX7 = gain factor 100
5751 = gain factor 70
12AT7 = gain factor 60
!2AU7 = gain factor 19
Look here:http://www.thetubestore.com/Gain-Factor
So it will be quiet and stable but I doubt a rock monster!
I often like a CV4004 or 5751 in the PI or in a cascaded preamp if it is a bit fizzy otherwise 12AX7/7025 or ECC83 work best for me.
12AX7 = gain factor 100
5751 = gain factor 70
12AT7 = gain factor 60
!2AU7 = gain factor 19
Look here:http://www.thetubestore.com/Gain-Factor
So it will be quiet and stable but I doubt a rock monster!
I often like a CV4004 or 5751 in the PI or in a cascaded preamp if it is a bit fizzy otherwise 12AX7/7025 or ECC83 work best for me.
Neil
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Re: What will 3 12au7s sound like?
Thanks.....but what if I put a tube screamer in front of it until I can afford good valves.....will it do?neikeel wrote:Pretty low gain
12AX7 = gain factor 100
5751 = gain factor 70
12AT7 = gain factor 60
!2AU7 = gain factor 19
Look here:http://www.thetubestore.com/Gain-Factor
So it will be quiet and stable but I doubt a rock monster!
I often like a CV4004 or 5751 in the PI or in a cascaded preamp if it is a bit fizzy otherwise 12AX7/7025 or ECC83 work best for me.
- bill bokey
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Re: What will 3 12au7s sound like?
12au7 draw a lot more current than 12ax7, I'm not sure it's totally safe for the amp...
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Re: What will 3 12au7s sound like?
According to the build instructions. ....I can use 12ax7, 12at7, 12au7, 12at7, 12az7, 12dw7, or 5751 in the preamp sectionbill bokey wrote:12au7 draw a lot more current than 12ax7, I'm not sure it's totally safe for the amp...
- neikeel
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Re: What will 3 12au7s sound like?
Give it a go and report back, I would drop some in one of m amps but I do not have any ECC82 or 12AU7sdanwelsh wrote:According to the build instructions. ....I can use 12ax7, 12at7, 12au7, 12at7, 12az7, 12dw7, or 5751 in the preamp sectionbill bokey wrote:12au7 draw a lot more current than 12ax7, I'm not sure it's totally safe for the amp...
A set of Sino 12AX7s can be incredibly cheap
Neil
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Re: What will 3 12au7s sound like?
Okay.....will doneikeel wrote:Give it a go and report back, I would drop some in one of m amps but I do not have any ECC82 or 12AU7sdanwelsh wrote:According to the build instructions. ....I can use 12ax7, 12at7, 12au7, 12at7, 12az7, 12dw7, or 5751 in the preamp sectionbill bokey wrote:12au7 draw a lot more current than 12ax7, I'm not sure it's totally safe for the amp...
A set of Sino 12AX7s can be incredibly cheap