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Old 2nd December 2012, 10:58 AM   #21
cjkpkg is offline cjkpkg  United States
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here's my el84 p2p build.
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Old 2nd December 2012, 11:46 AM   #22
tinitus is offline tinitus  Europe
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or this looks like fun
probably not the best
but simple, and easily 'updated' later on

EL84 driving EL84 SEP
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Old 2nd December 2012, 12:15 PM   #23
freax is offline freax  Australia
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KT88 SE Basic or Master Kit

You could always get the basic kit from Scott17

If I were the OP i'd be thinking about a single tube envelope per channel amplifier/audio triode + output pentode in one envelope, like the ECL82's

That way he can use 2 tubes, a SS rectifier, and spend a total of about $50-$100 on parts at most for 3.5 watts output in Single Ended.

http://bruceinjapan.blogspot.jp/2012...-tube-amp.html
http://nmwilliam.tripod.com/ecl82.html

'nuff said, kits rule!
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Last edited by freax; 2nd December 2012 at 12:35 PM.
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Old 2nd December 2012, 12:32 PM   #24
tomlang is offline tomlang  United States
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Some of us are building a "5 watt" amp using cheap line transformers at AK:

Parsimon: An Ultra-Cheap DIY Class AB PP Pentode Power Amp - AudioKarma.org Home Audio Stereo Discussion Forums
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Old 2nd December 2012, 01:39 PM   #25
tinitus is offline tinitus  Europe
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small cheap SE output trafo in EU would cost 30-50EUR, each
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Old 2nd December 2012, 02:44 PM   #26
yoaudio is offline yoaudio  United States
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Quote:
Originally Posted by cb5 View Post
Hi Everyone,

Im looking to build my first tube amplifier to power a pair of 8R bookshelf speakers.

Does anyone have any reccomendations?

Thanks
If you have the Omega Grande 8R Single Driver Speakers, Highly efficient. 96 dB sensitivity.

 8 inch Fostex drivers. (The Hemp version, not the Alnico.)
Then I would recomend a RH84 build.

Click the image to open in full size.


As Zekk put it in another thread-



Quote:
Originally Posted by Zekk View Post
I'm exhilarated by the great sonics coming out of my humble Magnavox 196 BA re-wired to a RH84SE circuit.
Only changed the choke to a Hammond 10H@150mA.
Despite the original PT of 260-0-260v, with a B+ of 276v, it did'nt lose out much to my regular McIntosh MC-30 monobloc.
What surprised me most was how quite it is, not a hiss from my 101dB Altec 604-E! Incredible!
Can't beleive that 3 tiny-wimpy tubes can thump my Mac !?
Bass is a big "WOW". s
This first listen to a SET have totally changed my mentality of the low watters! I'm now confident enough to build a RH66 if I can find the schematics for it. Can make use of the quad of KT66 Gold Lion from the MC-30.
This hobby is fantastic and wish I could have taken up electronics instead of structural engineering, 40 yrs. ago.
Cheers!
Zekk
In a output transformer shoot out in another forum--

On an RH84 build of mine, I recently tried the Hammond 125ESE, Edcor XSE15-8-5K, Edcor GXSE15-8-5K, and the Transcendar 5k-8ohm 10W SE Trasnformer.

Both the 125ESE and the Edcor XSE15-8-5k sounded very similar to each other with the Edcor having a bit more high-end detail. Both seemed to drop in performance on the low end.

The Edcor XSE15-8-5k costs half the Hammond for similar performance so I view the Edcor XSE as the better value compared to the Hammond. It is handy to have the multiple impedance taps on the Hammond for experimenting.

The Edcor GXSE15-8-5K was an overall good performer with a much improved bottom end compared to the 125ESE and the Edcor XSE15-8-5K.

The Edcor GXSE15-8-5K bottom and mid range sound was close to the Transcendar with the Transcendar sounding the best of the bunch with more high-end detail.
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Old 2nd December 2012, 07:41 PM   #27
cb5 is offline cb5  United Kingdom
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THANK YOU everyone, I will be looking through all the different options posted many thanks
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Old 3rd December 2012, 09:39 AM   #28
cb5 is offline cb5  United Kingdom
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Quote:
Originally Posted by freax View Post

If I were the OP i'd be thinking about a single tube envelope per channel amplifier/audio triode + output pentode in one envelope, like the ECL82's

That way he can use 2 tubes, a SS rectifier, and spend a total of about $50-$100 on parts at most for 3.5 watts output in Single Ended.

Bruce in Japan: ECL82 / 6BM8 Tube Amp
Single Tube amplifier

'nuff said, kits rule!
Im thinking of building this to start with, could i just use cheap output transformers that are available in the UK?

Is there anything specific i need to be aware of?

Thanks
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Old 3rd December 2012, 09:45 AM   #29
tinitus is offline tinitus  Europe
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please note....special tube
some of these 'compactron' tube types use weird tube bases
and those who don't, they can be 'in high demand'
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Old 3rd December 2012, 09:49 AM   #30
cb5 is offline cb5  United Kingdom
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Okay, maybe i should look at something else?

It just seems simple!
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