12AU7 vs 12BH7 vs 6CG7 - diyAudio
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Old 14th January 2003, 12:50 AM   #1
SHiFTY is offline SHiFTY  New Zealand
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Question 12AU7 vs 12BH7 vs 6CG7

Just wondering if anyone has compared these? Is there any clear winner? I am using a 12AU7 at the mo and have tried:

RCA 12AU7 cleartop
RCA 5693
Brimar 12AU7
Mullard CV4003
Sylvania 6??? (12AU7)
Philips Miniwatt ECC82
Siemens E82CC

To my ears, the Mullard and RCA 5693 sound the best; however I have heard people say that the 12BH7 will blow any 12AU7 out of the water. I have heard the 6CG7 is like a minituarised 6SN7 and is better again (although requires diff heater voltage)

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Old 14th January 2003, 02:24 AM   #2
Colt45 is offline Colt45  Serbia
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ive got some 5693s but i havent played them yet..

phillips E82CC sounds good.

but then im not one for brandnames..
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Old 14th January 2003, 08:09 AM   #3
SHiFTY is offline SHiFTY  New Zealand
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Umm gah should be RCA 5963, I guess I have 69 on the brain

I'm not one for brands either, but there are some clear differences between them. I am hoping someone can tell me about the 12BH7, I want to grab one of them
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Old 14th January 2003, 09:02 AM   #4
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Hi,

Quote:
however I have heard people say that the 12BH7 will blow any 12AU7 out of the water. I have heard the 6CG7 is like a minituarised 6SN7 and is better again (although
A 12BH7A iso a 12AU7A will often sound better.

The 6CG7 exists as 12CG7/12FQ7 and is not quite the same asa 12AU7.
They may be still in production at the former Yugo factory but I need to check this.
I know this factory still produces the 12BH7A though as a Philips licensee.

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Old 14th January 2003, 02:56 PM   #5
Joel is offline Joel  United States
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This is fairly dumb. A 12BH7 is not a 12AU7, etc. so, why shouldn't it potentially sound "better", or "worse" in any given circuit?
Are you using them both in the same amp, but adjusting all relevant circuit values to accomodate the different gain, currrent demand, plate resistances, etc?

I really would like one of you "shootout" guys to explain to me a statement like "I heard a 12BH7 will blow a 12AU7 out of the water."
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Old 14th January 2003, 09:17 PM   #6
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Default 12AU7A

Hi,

Take a circuit designed for a 12AU7A and replace that tube with a 12BH7A and 9 out of 10 it will sound better with the latter.

Shoot me,
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Old 16th January 2003, 12:55 PM   #7
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Default 6CG7

Hi,

Apparently this tube is still in production:

EI

Cheers,
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Old 17th August 2006, 11:29 AM   #8
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In my opinion the 12BH7 will sound much better than the 12Au7.

As Frank pointed out in an earlier post the 12BH7 in most cases is a plug in for the 12Au7.

The 6CG7/6fQ7 do sound like a 6SN7. The 6FQ7's in a RCA clear top will in most cases out shine the 5692's.

The 6FQ7/6CG7 is my favorite in the Aikido line stage as an input tube.
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Old 17th August 2006, 04:09 PM   #9
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Quote:
Originally posted by burnedfingers
In my opinion the 12BH7 will sound much better than the 12Au7.

As Frank pointed out in an earlier post the 12BH7 in most cases is a plug in for the 12Au7.

The 6CG7/6fQ7 do sound like a 6SN7. The 6FQ7's in a RCA clear top will in most cases out shine the 5692's.

The 6FQ7/6CG7 is my favorite in the Aikido line stage as an input tube.

I also like the 6FQ7/6CG7 in the input stage of the Aikido pre. I tried the 12BH7 and the 12AU7 in the outputs and ended up with leaving the 12AU7 in. The low end seemed a little more full compared with the 12BH7. Using 12AU7 in the input wasn't as clean sounding as the 6FQ7/6CG7. Using 12BH7 in the input was nice but the 6Fq7/6CG7 was even better. As you can see, these were the only tubes I had on hand and tried every combination possible...

I also tried the 5963 in the DIY Paradise simple pre circuit and ended up thinking that the sound was not real clean in the upper frequencies dispite having a full bottom end. Tried them in the Aikido but couldn't get the hum out, DC heaters and all.

These tubes all have different flavors and the bottom line is to use whatever sounds good to you no matter what the opinions of others are.
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Old 17th August 2006, 06:35 PM   #10
kegger is offline kegger  United States
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I'm with others here and and allmost every circuit where I subbed
a 12BH7 in for a 12AU7 the sound has improved.

You may want to watch the heater current though on some units,
but other then that they run the same circuits.
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