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Old 17th September 2011, 10:35 PM   #3641
Manta79 is offline Manta79  Netherlands
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Built some years ago, A Bill (KT88) variant (Triodedick with some Dalojan changes), including aluminum housing, Infrared remote, electronic motorized Alps, Nixie IN-13 Vu meter, numitron clock/display, controller Altera Max2 device FPGA. This tubeamplifier can also send "next number" signals to the first CD player from Philips that i have ;-) (CD100). Homemade 6SN7 6.3VDC powersupply based on a LM2576-Adj.

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Click the image to open in full size.


And i have built a Philips CDpro including infrared and controller in Altera FPGA (Cyclone2 programmable device), you can choose between LCD or numitron tubes display, includes a 1:1 tube buffer. Housing is homemade aluminium. 1.2 MB Floppydrive steppermotor ;-)

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Click the image to open in full size.

Some other tubehobbies of me: Nixieclock based on programmable Altera FPGA including DCF77 antenna, homemade housing, pcb's

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Last edited by Manta79; 17th September 2011 at 10:46 PM.
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Old 17th September 2011, 11:10 PM   #3642
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Manta79: A lot of work but very nice.
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Old 18th September 2011, 12:03 PM   #3643
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Default KT120 PSE Aikido drive

As promised I'm back on this issue. Finally KT120 PSE / Aikido drive is ready. I had some issues with PSU…. The first PSU was CRC and I did not get a clean sound… I tried all tricks but I couldn’t get free of PSU noise…. Finally I rebuilt this part with CLC filtering and all problems solved. Idle current was set after several test at 90 mA per tube – there was no noticeable sound difference from 80 up to 120 mA… With 90 mA I am sure the tubes will last longer. I do not have equipment to test this amplifier fully, but it sound as good as it looks… From the first listening I could remark an excellent control over all frequency range at all power levels. There is no “colored” frequency, tubbier sound or what so ever – very clean and clear with excellent dynamics. Compared with my previous KT88 PP I do not see any loose of bass. Miller capacitance effect – not a trace of it, Aikido makes a very good job. Coupling capacitors I used are military Russian Teflon, paralleled with smaller PIO and Styroflex. The cathode R’s are rated at 25W but they still get warm. There is no NFB at all..
After 4 hours of listening I seem to improve – but I believe it needs more time. Burn in not only for the tubes but for the C’s as well…
Well, finally I attach one more picture with the actual PSU…
Best regards to all,
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Old 18th September 2011, 05:18 PM   #3644
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Hello everyone.
Here's a project recently started doing, is not ready yet, very soon ...
https://sites.google.com/site/agalka...-c3g-s---el-34
Sincerely, Alex
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Old 18th September 2011, 08:53 PM   #3645
Jap is offline Jap  Poland
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Manta79 - very nice. I hate wood boxes for the apples which are used for the tube amps. My amp is going to the similar design like your one (box already finished). Will be presented soon.
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Old 18th September 2011, 09:30 PM   #3646
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Quote:
Originally Posted by GA Audio View Post
Hello everyone.
Here's a project recently started doing, is not ready yet, very soon ...
https://sites.google.com/site/agalka...-c3g-s---el-34
Sincerely, Alex
Very good.
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Old 19th September 2011, 02:27 PM   #3647
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Thumbs up beautiful

very nice clean lines and the clock is interesting and amazing looking.
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Old 19th September 2011, 05:03 PM   #3648
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Originally Posted by mhouston View Post
Very good.

Thank you.
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Old 20th September 2011, 08:51 PM   #3649
lowpoke is offline lowpoke  Australia
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@Manta79: Attention to detail is amazing!
@GA Audio: This project looks very impressive, as do all your others!
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Old 22nd September 2011, 06:43 AM   #3650
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Originally Posted by lowpoke View Post
@GA Audio: This project looks very impressive, as do all your others!
Many thanks for the nice review!
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