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Old 12th October 2010, 09:41 AM   #1
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Default OddWatt PP UL amplifier from scratch

Hi everybody,

here is my latest build of my premium amplifier, the OddWatt from Bruce Heran. Thank you Bruce for making this possible for all of us.

This amplifier is now second edition, it has some minor changes in the output stage wich will cause it to overdrive much more gracefully than the first version and the PSU is stabilized now. It is absolute noise free and frequency response is flat from 10 HZ till 22KHZ. Bruce rates this amplifier at 25 watt per channel, but this is with very low distortion, you get more like 33 to 35 watt per channel, before distortion becomes audible. I had the chance to compare this amplifier with some rather expensive tube amplifiers, but mine always wins, even against the Audionote. I am very proud to own such an amplifier. Here are some pics.
Attached Images
File Type: jpg OddBlock.jpg (49.8 KB, 260 views)
File Type: jpg Under the hood final new version.jpg (92.1 KB, 251 views)
File Type: jpg PSU new.jpg (96.3 KB, 250 views)
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Old 12th October 2010, 09:43 AM   #2
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Hi guys,

if anybody is interested in building this, I am happy to assist.



All the best.


Benny Buis
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Old 12th October 2010, 11:41 AM   #3
Ian444 is offline Ian444  Australia
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Hi Benny, you have been working towards this for some time. I'm really glad you are so happy with the results and the construction looks great, looks like you even made the PCB. Always nice to see projects like this.
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Old 12th October 2010, 01:18 PM   #4
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Hi Ian and everybody.

Yes, I make the PC boards myself, I try to combine the best of both, the PSU on a PC board keeps everything nice together and it is safe, IMHO. The amplifier part is wired in silver vintage cloth wire, a bit a hassle to work with but the result is very presentable, IMHO. Yes, I have been planning this rebuild for some time now, it turned out the way I wanted it to, without doubt. Everybody loves the sound of this amp, but some people judge me for using solid state in my amps. Yes, there are 5 controllers in my amp, two LM317 for the constant current source and two LR8 high voltage controllers for the PSU and a 12 volt controller for the pre stage filaments. But those controllers make this amplifier what it is, the LM317 forces the amp to operate to 100 % Class A, the LR8 make out of the PSU a big battery, absolute ripple free, well as far as I can measure, and this is about -90 dB, more will my old Oscilloscope not do, but this is still better than most premium ss amps on the market. The final hum test is done with high sensitive headphones, 4000 ohm impedance, the kind of headphones you use to build a crystal radio, you can listen to your local AM station just with those headphones and 20 yards of wire and a germanium diode, pretty cool. Anyway, direct connected to the cartridge of the record player, you hear the music loud and clear, now this impressed the hell out of me. Anyway, why I tell you is, those are super sensitive, and if I hear no noise using those in combination with load resistors, I consider the amp noise free. Those headphones don't replace an oscilloscope, but they are a nice addition to it. If you love tubes like I do, get such a pair, if you have a chance, you can thank me later. Tracing signal and noise, unbeatable, IMHO.
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File Type: jpg Vintage Headphones (450 x 600).jpg (64.1 KB, 194 views)
File Type: jpg OddBlock Series 1 edition number 2.jpg (118.8 KB, 440 views)
File Type: jpg KT88-PP PSU old.jpg (95.5 KB, 123 views)
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Old 12th October 2010, 01:44 PM   #5
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Sorry guys, I posted by accident the old PSU schematic, here comes the upgrade. The heater circuit is unchanged, so I didn't draw it again. Enjoy.
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File Type: jpg Benny's new PSU.jpg (65.4 KB, 112 views)
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