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Old 2nd March 2009, 01:31 PM   #11
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The Audioromy FU13 originally has
Output tube: Fu13/ 813 2
Input: 12AU7 x2,
Driver tube: 6DJ8 x2
Rectifier tube: 5Z3P x1

And its 22kg not 28 as some advertisers claim
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Old 2nd March 2009, 02:17 PM   #12
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Thanks for quick and useful input guys,

I spent some time searching through your previous posts, Koifarm, looking for a diagram. Would you mind reposting here so we can collect an Audioromy info thread?
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Old 2nd March 2009, 02:48 PM   #13
Koifarm is offline Koifarm  Netherlands
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There is no excact schematic in the links. Just one of a previous audioromy 845.
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Old 2nd March 2009, 03:21 PM   #14
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Guess Ill have to start tracing one from the amp then, its a good way to get to know it anyway.

About tube exchange you were talking about ecc99 needing more heater current. But you dont need to do any changes in the amp, so it will run cooler, is that correct?

I want to buy a set of tubes for the amp and keep the originals in reserve. Would this be the best set:
a more linear input ecc99
Drivers Ecc88 - what is the effect?
Rectifier as standard
and Output 813s - Find something for better longevity I have heard the FU13 only last 2-3000hr
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Old 2nd March 2009, 03:37 PM   #15
Koifarm is offline Koifarm  Netherlands
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The ECC99 needs MORE current so the amp will be a little hotter. You do not have to change anything. You got less distortion and more linearity and more dynamic/drive.

The tube setup is very personal. Do not change the brand for the FU13. We treid about every 813 tube we get our hands on but the shuguang FU13 sounds the best.

For the record:

The 6dj8( ecc88 or ecc85) is the inputstage.
The 12ax7 is the driver.
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Old 3rd March 2009, 08:05 AM   #16
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Keeping the FU13 is great, it seems you can spend a lot of money on 813 tubes, and the FU13 would be cheaper I guess.

Sorry for the mix up of input and driver, it just goes to show how imprecise information from the sellers is on these things.; And how much of a newbie I am.
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Old 3rd March 2009, 10:24 AM   #17
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Yikes - I've been collecting NOS 813s. Seems I should have been collecting FU13s.

What's the difference in sound?

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Old 3rd March 2009, 10:54 AM   #18
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http://img46.imageshack.us/my.php?image=fu13ie1.jpg

With a descent driver there should be no need for NFB......

I guess the 6DJ8 and ECC99 could do it without the 12AX7.
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Old 3rd March 2009, 12:58 PM   #19
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Thanks for the diagram!

Once again I have to admit defeat what is NFB?
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Old 3rd March 2009, 03:02 PM   #20
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NFB = negative feedback. Usually a loop from output back to input, where it is more correctly called "global" NFB, but can be local as well, e.g. round two stages. NFB can reduce distortion but it may not always sound better and can also introduce instabilities. The simple solution with innately low distortion triodes is not to use it. With pentodes it has much more popularity, and with solid state devices it is almost compulsory.

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