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Old 23rd March 2007, 08:33 AM   #1591
okmrbh is offline okmrbh  Canada
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Hi, Hdaudio. I'm not sure it could be.
Here is some more info from:


http://www.tubesandmore.com/


KIT - STEREO INTEGRATED TUBE AMPLIFIER

K-502

Tube designs rival the sound of high end audio amplifiers that cost 10 times as much! This kit was designed by George Fathauer. Enjoy the thrill of high end audio without going broke and enjoy the satisfaction in building it yourself. Kit comes complete will all parts and easy to follow instructions. Easily built in one evening. Uses 11BM8 tubes included in the kit. Also included pine board for mounting PC board and transformers.


Input Impedance: 100K ohms
Output Impedance: 8 ohms
Power Output: 8 watts
Frequency Response: 20 to 20,000 Hz
Minimum Input for Full Output: 0.3 V
Total Harmonic Distortion @ 1 W: <1%
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Old 23rd March 2007, 02:34 PM   #1592
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Thumbs up Headphone amp 6c4pi + 6c45pi

Newly assembled headphone amp (the picture was taken meanwhile - the actual will be posted tomorrow).

The amp uses Russian tubes:
- voltage amp: 6C4PI with LED bias
- output stage: 6C45PI with Si diode bias and choke loaded cathode follower + output cap.

Headphones: Sennheiser 420SL, (designed for Philips HP1000)
Weight: 8,5 kg bare.

The design is proved to be ok: detailed and godd bass, still some hum.
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Old 2nd April 2007, 01:56 AM   #1593
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Hi Yagoolar, your products is look very nice, however I can't imagine how to put into pocket ?



Hereby is my headphone-amp to use small tube, if you know the price of these tubes in Vietnam # 6 cent !!! , the OPT is made from US military' core.
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File Type: jpg pre for headphone outside.jpg (80.4 KB, 2466 views)
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Old 2nd April 2007, 01:58 AM   #1594
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Inside view
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File Type: jpg pre for head phone.jpg (84.9 KB, 2490 views)
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Old 5th April 2007, 07:30 PM   #1595
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Click the image to open in full size.

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Old 5th April 2007, 07:35 PM   #1596
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Quote:
Originally posted by viagraless
Hi Yagoolar, your products is look very nice, however I can't imagine how to put into pocket ?



Hereby is my headphone-amp to use small tube, if you know the price of these tubes in Vietnam # 6 cent !!! , the OPT is made from US military' core.
Unless you are a kangaroo
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Old 8th April 2007, 10:09 PM   #1597
SRMcGee is offline SRMcGee  United States
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Default Aikido Preamp

Folks:

It took me over a year to plan, lay out and build this Aikido preamp, and along the way a lot of people helped. Special thanks go to Bas Horneman (http://home.zonnet.nl/horneman/) and Mikkel Simonsen (http://electronics.dantimax.dk/); Bas supplied the John Broskie-approved Aikido PCBs and Mikkel supplied the Dantimax remote control system. Both Bas and Mikkel provided a lot of support to this newbie. The preamp is built in two ATI Research enclosures; the power supply box sports 3 transformers -- two are dedicated to the preamp and power supply circuits and the other is dedicated to the remote control system. In the preamp box, the Dantimax Control2 PCB and the LCD display are shielded behind an aluminum bracket and copper sheeting assembly, while the preamp PCBs sit above a piece of stainless steel.

The preamp sounds great: open, detailed and airy. Wonderful soundstage and excellent resolution. There is no discernable hum. I used my Hagtech FryKleaner to burn the Aikido in and have been enjoying the results ever since.

I may add a few improvements -- the RCA connectors may be upgraded to Cardas plugs I have on hand, some T-pads may be installed to lower the gain slightly and an on/standby indicator LED (based on Jim Hagerman's circuit at http://www.hagtech.com/pdf/led.pdf) may be added to the power supply enclosure.

Otherwise, this preamp is done. Time to consider new projects!

Regards,
Scott
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Old 8th April 2007, 10:13 PM   #1598
SRMcGee is offline SRMcGee  United States
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Default Aikido Preamp

Here is a rear view of the Aikido preamp:
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File Type: jpg aikido preamp (rear view) 040807.jpg (97.1 KB, 1711 views)
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Old 8th April 2007, 10:14 PM   #1599
SRMcGee is offline SRMcGee  United States
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Default Aikido Preamp

A rear view of the power supply:
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File Type: jpg aikido ps (rear view) 040807.jpg (86.8 KB, 1631 views)
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Old 8th April 2007, 10:21 PM   #1600
SRMcGee is offline SRMcGee  United States
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Default Aikido Preamp

An interior shot of the power supply enclosure:
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File Type: jpg aikido ps (exposed top view) 040807 (small).jpg (52.0 KB, 1856 views)
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