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Old 11th June 2006, 02:10 PM   #1091
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Quote:
Originally posted by Mr. Triatic
->rwellerson
..Stunning!!
Which transformers are you using?
Hi. Mr T

Thanks for the "stunning"....
As I said just above the trafos are done under my specs and by a very good guy in this art.
All of them oversized for their jobs.
For ex.: the output ones we're done to stand 100WRMS each in this 60WRMS per channel amp.
Believe me: bass is way much better (not more bass but lower and lower bass...)

[ ]
Ricardo
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Old 12th June 2006, 12:46 PM   #1092
jane is offline jane  Norway
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Default MiniPP, EL84 power amp

MiniPP, EL84 power amp.

Distortion figures are quite good: less than 50dB (mainly 3rd harmonic -- higher order harmonic less than 70dB) at 5V rms output into 8-ohm resistive load. Onset of clipping is about 7V rms.

Feedback mix: Local shunt feedback: ~8dB, loop feedback ~10dB.
Zo is less than 1 ohm.

Click the image to open in full size.

Some tweaking/testing with different feedback fractions, idle current etc are still to be done.

Latest schematic:
Click the image to open in full size.

Jan E Veiset
NO-6600
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Old 12th June 2006, 01:11 PM   #1093
SY is offline SY  United States
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The 12AT7 is a great choice there (that's what I use in my EL84 amp). High mu, excellent linearity at the 10-15V swings needed for that circuit.
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Old 12th June 2006, 11:36 PM   #1094
arnoldc is offline arnoldc  Philippines
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My little preamp

Front:
Click the image to open in full size.

Back:
Click the image to open in full size.

Porn:
Click the image to open in full size.

The little one can take WE407/396, 2C51, 5760 tubes.
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Old 12th June 2006, 11:40 PM   #1095
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by arnoldc
My little preamp
ugly!
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Old 12th June 2006, 11:56 PM   #1096
arnoldc is offline arnoldc  Philippines
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Thanks for the compliment choky
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Old 13th June 2006, 06:47 AM   #1097
ddd is offline ddd  Bulgaria
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arnoldc, it's a matter of style. The wood is not a must in every design. I think this is a sample of nice and clever constraction!!!
choky is obviously a fan of the kitsch. Sorry, choky.
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Old 13th June 2006, 11:53 AM   #1098
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Shishido style IITC 801A amp. PSU is a separate chassis.
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File Type: jpg 801a_amp_sm.jpg (98.2 KB, 1846 views)
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Old 13th June 2006, 12:05 PM   #1099
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by ddd
....... The wood is not a must in every design. .......

it isn't?
how?

http://choky.on.neobee.net/images/Choky's%20WOT.jpg





now-that is not ugly....it's a mess
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Old 13th June 2006, 04:19 PM   #1100
ddd is offline ddd  Bulgaria
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Quote:
Originally posted by choky



it isn't?
how?

http://choky.on.neobee.net/images/Choky's%20WOT.jpg





now-that is not ugly....it's a mess
Your preamp is nice, choky, but as standard as the others in that style. I could describe arnoldc's design as brave and out of temporary fashion. That's why I liked it.
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