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Old 27th September 2012, 12:25 AM   #31
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So, add another gain stage?
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Old 9th October 2012, 09:21 PM   #32
pilovis is offline pilovis  Italy
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The amplifier is finished! , the sounds is so great!

Wow, Wow, Wow

I did not use any feedback since I don't like it (it flattens the bandwidth).

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Last edited by pilovis; 9th October 2012 at 09:29 PM.
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Old 9th October 2012, 09:27 PM   #33
pilovis is offline pilovis  Italy
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Quote:
Originally Posted by Original Burnedfingers View Post
So, add another gain stage?
There is no need to add any extra gain stage, the gain is more than enough, tested! .

Last edited by pilovis; 9th October 2012 at 09:33 PM.
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Old 10th October 2012, 06:50 AM   #34
pilovis is offline pilovis  Italy
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Click the image to open in full size.

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Old 10th October 2012, 12:27 PM   #35
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Hi pilovis.

Beautiful assembly and great case. I have a couple of concerns though. I assume that the larger white transformer is the main line-power transformer, and the two black transformers are output transformers. If you connect large loudspeakers with good bass response, and you might hear more 50Hz hum in one channel than in the other that could be because the middle output transformer is mounted parallel to the line transformer. If you turn that transformer around 90 Degrees you will probably find that the hum is reduced.

A second comment is that I believe that the rectifier tube is too close to the power output tube 807. During operation the two tubes would heat each other up and may overheat the glass where they almost touch. Power-tubes like these should not be closer to each other than about 20mm.

Congratulations on a beautiful construction.

Hans J Weedon.

Last edited by HJWeedon; 10th October 2012 at 12:32 PM.
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Old 10th October 2012, 12:56 PM   #36
pilovis is offline pilovis  Italy
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Quote:
Originally Posted by HJWeedon View Post
Hi pilovis.

Beautiful assembly and great case. I have a couple of concerns though. I assume that the larger white transformer is the main line-power transformer, and the two black transformers are output transformers. If you connect large loudspeakers with good bass response, and you might hear more 50Hz hum in one channel than in the other that could be because the middle output transformer is mounted parallel to the line transformer. If you turn that transformer around 90 Degrees you will probably find that the hum is reduced.

A second comment is that I believe that the rectifier tube is too close to the power output tube 807. During operation the two tubes would heat each other up and may overheat the glass where they almost touch. Power-tubes like these should not be closer to each other than about 20mm.

Congratulations on a beautiful construction.

Hans J Weedon.
Very good points!
I will add a small internal fan.
Fortunately, there is no udible hum.

This is the video I took with my small digital camera :
807 tube Ultralinear Class A - Stereo Hi-Fi Amplifier - YouTube

and just another picture:

Click the image to open in full size.

Last edited by pilovis; 10th October 2012 at 01:03 PM.
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Old 11th October 2012, 07:18 PM   #37
pilovis is offline pilovis  Italy
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I listened to this amplifier connected to a pair of huge Warfedale E90, 100 kilograms of speakers

Wow, It was amazing, at almost full volume (7+7W), the room was full of sound with no audible distortion and very good quality of sound!

Someone told me this amplifier wouldn't have enough gain, some other told me the penthode driver wouldn't have a good sound .

No comments

Warfedale E90

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Old 11th October 2012, 07:56 PM   #38
pilovis is offline pilovis  Italy
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The trick of the gain is in the capacitor between the driver's screen grid and ground
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