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Old 7th January 2012, 12:18 AM   #11
scott17 is offline scott17  United States
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Here is another candidate:

http://i263.photobucket.com/albums/i...5StereoAmp.gif

From this site:

Electronics Projects - Vacuum-State Electronics
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Old 7th January 2012, 12:28 AM   #12
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What kind of output transformers do you have?

Tubes are cheap. Transformers are more expensive.
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Old 7th January 2012, 12:40 AM   #13
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Why not buy a 12AT7 and build the RH84SE amp? Lots of people have built it and are pleased with the results.
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Old 7th January 2012, 01:07 AM   #14
kmaier is offline kmaier  United States
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I'm leaning towards Wavebourn's response... look at what OPTs you have or what you're willing to spend on a pair. That will dictate your amp overall... and you should consider the output tube and stage topology at the same time.

Oddly, 45 triodes are a bit less expensive these days... for a couple watts, it's difficult to think you could possibly do better. And at the same time, consider what you are going to be driving as a speaker... that also influences what you would or could be happy with.

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Old 7th January 2012, 01:34 AM   #15
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Quote:
Originally Posted by kmaier View Post
Oddly, 45 triodes are a bit less expensive these days... for a couple watts, it's difficult to think you could possibly do better.
4P1L
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Old 7th January 2012, 01:57 AM   #16
kmaier is offline kmaier  United States
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Quote:
Originally Posted by Wavebourn View Post
4P1L
I can't argue with you on this one... I just don't have any of them (4P1L) to play with. I do have an extensive collection of 45 triodes... so I will sign up for being well versed on the 45. What differences do you perceive between the 45 and 4P1L?

Regards, KM
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Old 7th January 2012, 02:25 AM   #17
scott17 is offline scott17  United States
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No offense, but you all just go off on your own tangents all the time, don't you.

OP has EL84, 12AX7.

No mention of 12AT7, 45s, 4P1L, blah, blah, blah.

Please stick to the subject at hand.

http://i263.photobucket.com/albums/i...5StereoAmp.gif
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Old 7th January 2012, 02:32 AM   #18
scott17 is offline scott17  United States
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Bad link. Here is the correct one:

http://i263.photobucket.com/albums/i...5StereoAmp.gif
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Old 7th January 2012, 03:16 AM   #19
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in addition, unless you want ot spend up on opts, you are stuck with the opts you have (presumably SE).

Just build. How much research do you need when you have all the major components and there are only two or three workable combinations to use them?
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Old 7th January 2012, 03:17 AM   #20
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As Waveborn asked, "what kind of OPT's do you have"? SE and PP opt's are not the same!
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