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Old 2nd September 2008, 01:02 PM   #1
sarrisk is offline sarrisk  Greece
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Default set el84 tube amp

Hi all ! I made this ( weak ) but really interesting amp few years ago (based on decware SE84) .
Its only 1.8 watt and now with my BL Horn Speakers i discover what a SET low power design can do !

just want to share it because it's simple construction.


Click the image to open in full size.

costas
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Old 2nd September 2008, 01:40 PM   #2
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Congratulations! How do you like it compared with your previous amplifiers?
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Old 2nd September 2008, 01:56 PM   #3
sarrisk is offline sarrisk  Greece
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Thanks !
This baby sounds really sweet (more sweet than my 807s, but lacks in dynamics) .
Its because of the el84 which is great tube ! . Obviously its 1,8 watt /channel its not a tremendous power but you can really enjoy solos , voices and ballads.

costas
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Old 2nd September 2008, 03:10 PM   #4
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Congratulations! Is EL84 in triod mode?
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Old 3rd September 2008, 01:34 AM   #5
Akita is offline Akita  Malaysia
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Nice wood chasis, I like that
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Old 3rd September 2008, 10:00 AM   #6
sarrisk is offline sarrisk  Greece
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Quote:
Originally posted by azazello
Congratulations! Is EL84 in triod mode?

Quote:
Originally posted by Akita
Nice wood chasis, I like that

Thanks !
El84 is in triod mode . Here is the schematic

Click the image to open in full size.

costas
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Old 4th September 2008, 01:43 AM   #7
Akita is offline Akita  Malaysia
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Interesting, What is the bias voltage of your 6n1p? Do it sound different by switch it to others bias point?
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Old 4th September 2008, 09:03 PM   #8
sarrisk is offline sarrisk  Greece
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Quote:
Originally posted by Akita
Interesting, What is the bias voltage of your 6n1p? Do it sound different by switch it to others bias point?

I never connected the 1,5k resistor in the bias circuit. If i remember well when checked once when first tested the amp sounds no difference. So 2 years before i modified the driving stage with this :

Click the image to open in full size.

RK=430 ohm for Vp=250 volt

it matching better now.

regards
costas
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Old 4th September 2008, 09:18 PM   #9
sarrisk is offline sarrisk  Greece
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personally i prefer 6922 instead of 6N1P . In my ears sounds more sweet .

costas
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Old 5th September 2008, 10:15 PM   #10
Zmeika is offline Zmeika  Bulgaria
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Hi ,
what kind of 6922 do you prefer?

regards Zmeika
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