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Old 14th December 2004, 08:10 PM   #1
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Default SE tube in mono amp

Well after much research and studying I am ready to build my first amp. A modest endeavor , Mono amp with a full range speaker.
My difficulty is I am not sure which tube to use for the output.
It will be low power 3 - 5w. Doing a search on the board iy seems that people like the w300b , but is that over kill for this project.


Jeff(tenderfoot)
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Old 14th December 2004, 08:32 PM   #2
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hi! well as far as i'm concerned is 300B slightly overkill...

a simple ECL86 would be sufficient..
http://www.bonavolta.ch/hobby/en/audio/ecl86.htm

are you still into 300B look at this:
http://www.ptsoundlab.com/sectubes/s...s78wclassa.htm

or maybe something with EL84?
http://www.jogis-roehrenbude.de/Lese...E/Goecking.htm
or
http://members.at.infoseek.co.jp/lagarto/el84se_diy.htm

-Good luck!!
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Old 14th December 2004, 08:36 PM   #3
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hi, do a google search for 6aq5 a lovely little tube quite plentifull and relatively cheapto get and nice sounding to boot as some would verify, there are numerous jap hobbiests who have posted se circuits on it, combine this little tube with the little hammond [ the designation of which escapes me right now] though I know of some who are offering 2a3 triode kits using this traffo ie: angela..... -se op traffo and you are in business..... must be getting old and demented as I can see i'm all over the place writing this... hope you can make some sense of this rambling.... merry xmas and all the best from sunny down under cheers tomcat
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Old 15th December 2004, 01:15 AM   #4
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I'm listening to Diana Krall Live in Paris on the speakers in my avatar on a three tube SE amp right now. Each half of a 12AX7 driving a 6BQ5 in SE for stereo. I cannot believe how much tone this re-capped little Magnavox console pull has!

Shweeeeeet!
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Old 15th December 2004, 01:32 AM   #5
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Default to many choices

Her is a crazy idea how about a 6bm8(since I am green i have now idea how these tubes sound) --- I still am quite concerned
about SQ evan though it is mono and plan to use a good speaker



jeff
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Old 15th December 2004, 03:08 AM   #6
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Default blah

I guess after further review 6bm8 is a ecl86 . similar to prev mentioned ecl82. well I got it narowed down ... to 100 tubes
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Old 15th December 2004, 05:37 AM   #7
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Default Re: blah

Quote:
Originally posted by tenderland
I guess after further review 6bm8 is a ecl86 . similar to prev mentioned ecl82. well I got it narowed down ... to 100 tubes
6BM8 is an ECL82... it was designed for the dual use of TV tube & audio tube... it is like half of a 12AT7 and an EL95 in the same bottle. Puts out about 3-3.5 W in pentode, half that in triode.

Here is a tread on a 6BM8 amp Morse built:

No bang, no flash, just music!

The ECL86 was the audio specific successor to the ECL82. Like half a 12AX7 + an EL84, 4-4.5W in pentode.


Both can be used to make nice little amps.

dave
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Old 15th December 2004, 11:04 AM   #8
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Default Cheap and simple

Hi,

If you only need 1-2W, check this schema:
lo scherzo
from Audiokit

I've made these monoblocks using Hammond 125ESEs. They sound really good with Fostex FE206E BLs.

best regards,
Pete
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Old 15th December 2004, 11:36 AM   #9
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Why not try something with less common valves? I don't know how adventurous you want to be with your first project, so maybe I shouldn't be bringing this up, but thse valves look so cool

VHF double tetrodes like the 829B or 832 are rarely used for anything, and thus are fairly cheap. Pete Millett says that he bought 6 RCAs and 2 Mullards for the price of a Sovtek 2A3. Many more could be had if you had a 300B budget!

Click the image to open in full size.

Details of Pete Millett's 829B amplifier here, and schematic.

Also, there seems to be an 832 SE amplifier under development in this thread.

Edit: The picture shows up rather big here, oh well....

I forgot to say, this set up gives around 5W output per channel triode connected. No triode mode curves are shown on his site, but Paul De Raymond Leclercq (7N7 on this site) prepared some curves and is graciously willing to share them if you email him.
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Old 15th December 2004, 01:17 PM   #10
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Default schematic

I have a question concerning schem posted by Pete


Scherzo


1) not certain about the feed back connection and how to go from pentode to triode mode.

does the fill connect to green , yellow on the power trany
due to the fact the fills are in series in the tube ?


Jeff
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