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Old 17th June 2013, 01:17 PM   #3031
ALP is offline ALP  Russian Federation
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Talking Germanium transistors power amplifier with low distortion

90% finished power amplifier on germanium transistors.
I`m builder, but please follow link to autor of circuit -http://devicemusic.ucoz.ru/blog/25_vattnyj_bystrodejstvujushhij_usilitel_na_german ievykh_tranzistorakh/2011-02-12-4 (sorry, but Russian language only)


Specs:

Output power - 25W/4Ohm or 12,5W/8Ohm per channel
Range - 10-20kHz
Distortion - less than 0,1% at 1 kHz 10W/8Ohm
Idle current - ~0,35-0,45A


Transistors:

JFET1-JFET2 - K504NT3 (Si-JFET, К504НТ3, my be replaced pair 2SJ103)
Q100, Q102 - MP21A (GE-PNP, МП21А, http://lampilich.narod.ru/tr/small/mp20_21.html)
Q104, Q108 - ASY29 (GE-NPN, first version - MП38A - http://lampilich.narod.ru/tr/small/mp35_36_37_38.html)
Q105, Q106, Q107 - GT404G (GE-NPN, ГТ404Г, http://lampilich.narod.ru/tr/small/gt404.html)
Q111, Q112 - Р605A (GE-PNP, П605А, http://lampilich.narod.ru/tr/b_big/p605.html)
Q113, Q114 - 1T806A (GE-PNP, 1Т806А (mil spec grade) or ГТ806 (industrial grade) - http://lampilich.narod.ru/tr/b_big/gt806.html)

Sound:

Fast, clean, deep bass. Smooth high. Fantastic powerfull sound!
Attached Images
File Type: jpg 25GE_1CH.jpg (367.2 KB, 1130 views)
File Type: jpg 25GE_InSide_1.jpg (208.1 KB, 1099 views)
File Type: jpg 25GE_InSide_4.jpg (320.3 KB, 1057 views)
File Type: jpg 25GE_InSide_7.jpg (203.4 KB, 984 views)
File Type: jpg Sine_1kHz_FullPower_8Ohm_x10.jpg (101.8 KB, 917 views)
File Type: jpg Sine_10kHz_FullPower_8Ohm_x10.jpg (112.6 KB, 156 views)
File Type: jpg Sine_20kHz_FullPower_8Ohm_x10.jpg (107.0 KB, 109 views)
File Type: jpg Square_1kHz_FullPower_8Ohm_x10.jpg (106.6 KB, 125 views)
File Type: jpg Square_10kHz_10W_8Ohm_x10.jpg (106.0 KB, 168 views)

Last edited by ALP; 17th June 2013 at 01:22 PM.
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Old 17th June 2013, 03:24 PM   #3032
Bonsai is offline Bonsai  Taiwan
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Wow! That is a nice build. Congratulations!
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Old 17th June 2013, 04:28 PM   #3033
redjr is offline redjr  United States
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Great looking, clean build. And fantastic internal layout. Wonderful job and attention to detail. I love it.
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Old 18th June 2013, 04:59 AM   #3034
DAS3 is offline DAS3  Russian Federation
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to ALP
SUPER!
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Old 18th June 2013, 06:05 AM   #3035
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Looks cute will have a look at it

kind regards,

Harrison.
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Old 23rd June 2013, 07:26 AM   #3036
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Smile small, but powerfull amp

I saw a case, including two quite large heat sinks on Alibaba.com lately. As it cost nearly nothing, I gave it a try, and bought one. VERY nice!!
I designed a small yet powerful amplifier lately, which is quite universal and simple. This design has been applied to numerous other projects in the past and sounds very good indeed. So, here we go: take a few of those fine 2SA1095 / 2SC2565 ringemitters, build everything nice and clean on the heat sink and squeeze a 300VA toroid in the middle of it all. It's not ready yet, but... it won't take long I hope!
And yes, all those connectors were inclued in the price of less than $ 50,- which should be reagarded as an absolute bargain! Even the mains switch (Alps!) and the turned, massive aluminum knob for the volume pot is included! I just ask myself: HOW can this be so cheap? Of course, it's made in China
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File Type: jpg IMG_2406.jpg (408.7 KB, 495 views)
File Type: jpg IMG_2408.jpg (398.0 KB, 498 views)
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Old 23rd June 2013, 07:40 AM   #3037
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Quote:
Originally Posted by 325addict View Post
I saw a case, including two quite large heat sinks on Alibaba.com lately. As it cost nearly nothing, I gave it a try, and bought one. VERY nice!!
I designed a small yet powerful amplifier lately, which is quite universal and simple. This design has been applied to numerous other projects in the past and sounds very good indeed. So, here we go: take a few of those fine 2SA1095 / 2SC2565 ringemitters, build everything nice and clean on the heat sink and squeeze a 300VA toroid in the middle of it all. It's not ready yet, but... it won't take long I hope!
And yes, all those connectors were inclued in the price of less than $ 50,- which should be reagarded as an absolute bargain! Even the mains switch (Alps!) and the turned, massive aluminum knob for the volume pot is included! I just ask myself: HOW can this be so cheap? Of course, it's made in China
link?
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Old 23rd June 2013, 08:58 AM   #3038
Bonsai is offline Bonsai  Taiwan
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Default New sx-Amplifier build

Here's another sx-Amp that I built this week end. I bought another case like the one I used for the nx-Amp and started assembly yesterday. Its playing now through my B&W's (Houston Person 'Mellow' - very laid back Jazz CD).



The heatsinking on this case is very good compared to the old one. I'will be using the old one for a new 10W class A amp I am working on ('ux-Amplifier'). The ux-Amp is a CFA single ended input stage design with some similarities to the JLH 10 Watter - but enough of that for now.

Some pics

Attached Images
File Type: jpg SX1.JPG (350.9 KB, 477 views)
File Type: jpg SX2.JPG (358.8 KB, 370 views)
File Type: jpg SX3.JPG (377.9 KB, 183 views)
File Type: jpg SX4.JPG (360.7 KB, 232 views)
File Type: jpg SX5.JPG (214.1 KB, 250 views)
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Old 23rd June 2013, 09:17 AM   #3039
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Default Case is from...??

Hello Bonsai,

where did you get that beautiful case? And what does it cost?


Thank you,

Timmo.
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Old 23rd June 2013, 10:24 AM   #3040
Bonsai is offline Bonsai  Taiwan
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325addict it's from Tang Hill International in Taipei it costs about $130. It's actually a Erno Borbelly amp case. If you order one, make sure it's the stereo version.
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