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 Forum: Audio, radio, and electronics   Topic: Hi-Fi amp with guitar transformer

Posted: Fri Aug 17, 2018 1:33 pm 

Replies: 42
Views: 21863


Hercules amp is an attempt to design a high-end audio amp better than first Pyramid amp that required 4 of 6L6GT tubes in parallel in order to get satisfactory low audible distortions, ...

 Forum: Audio, radio, and electronics   Topic: PP UL GU50

 Post subject: Re: PP UL GU50
Posted: Mon May 27, 2013 3:00 pm 

Replies: 5
Views: 4897


... can't use anode voltage above 300 Volt, as the result the tube will be under-powered. Look at Pyramid schematics, I used there feedback from anodes to first grids of Gu-50 tubes. It is better ...

 Forum: Audio, radio, and electronics   Topic: PP UL GU50

 Post subject: PP UL GU50
Posted: Mon May 27, 2013 6:36 am 

Replies: 5
Views: 4897


... that of elektor, to help newbies like me. I am looking for a diagram that has been proven (the pyramid looks very well!) with references to the Transformers from output to order, the bias setting, ...

 Forum: Audio, radio, and electronics   Topic: GM-70 with 4P1L pentode DRD driver

Posted: Mon Jan 28, 2013 6:16 pm 

Replies: 35
Views: 16165


Now it looks better! I will have soon PCBs available for power supply designed for Pyramid amps. Probably kits with all parts included will be available. Here is schematic attached. One small ...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Thu Apr 14, 2011 9:00 am 

Replies: 40
Views: 22072


How do you bend the perforated sheet? I cut 2 steel angles for sizes. One of them 15 inches, another 17 inches, the third one is bigger. Sandwich them and clamp in a vise. Then bent by hand, helping ...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Mon Apr 11, 2011 11:23 pm 

Replies: 40
Views: 22072


Is it tricky to dirll the perforated sheet? is it aluminum or steel? What kind of rig do you use to bend it? Not at all, I use Greenlee hole punches. They are expensive, but worth it. I use aluminum,...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Mon Apr 11, 2011 9:18 am 

Replies: 40
Views: 22072


Anatoliy, just the way you came up with a chassis impress me a lot, apart from the morgan jones book I haven't seen original approaches like yours when coming up with a chassis. Specially taking into...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Sun Apr 10, 2011 10:29 pm 

Replies: 40
Views: 22072


Anatoliy, just the way you came up with a chassis impress me a lot, apart from the morgan jones book I haven't seen original approaches like yours when coming up with a chassis. Specially taking into ...

 Forum: Audio, radio, and electronics   Topic: GU-50 push-pull amp

 Post subject: Re: GU-50 push-pull amp
Posted: Thu Mar 17, 2011 8:49 am 

Replies: 6
Views: 7209


... cores, but I am afraid we can't make in Edcor price range. Speaking of schematic, you can take Pyramid-VII-M bones. It's real High-End.

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Fri Dec 10, 2010 7:28 pm 

Replies: 40
Views: 22072


Копирую с форума hiend.borda.ru =======cut here================= majordom22 пишет: цитата: Гoсть Хотелось бы полностью схему.Думаю,Вы раз...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Mon Dec 06, 2010 3:48 pm 

Replies: 40
Views: 22072


Here is the schematic.

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Mon Dec 06, 2010 3:17 pm 

Replies: 40
Views: 22072


what is the role of the magic eyes? how do they work? I tot they were used in radios only. Power output indicators. Crater is kind of anode covered by fluorescent thing that is ionized by electrons t...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Mon Dec 06, 2010 12:00 am 

Replies: 40
Views: 22072


what is the role of the magic eyes? how do they work? I tot they were used in radios only.

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Wed Dec 01, 2010 11:17 am 

Replies: 40
Views: 22072


Simply beautiful =D> =D> =D> ... I am sure it sounds even better. :)) Can't wait to hear some sample recordings from it. btw, what are the tubes glowing green in the middle of the picture? [...

 Forum: Audio, radio, and electronics   Topic: Pyramid-VII: home stereo vacuum tube amp

Posted: Wed Dec 01, 2010 10:49 am 

Replies: 40
Views: 22072


Simply beautiful =D> =D> =D> ... I am sure it sounds even better. :)) Can't wait to hear some sample recordings from it. btw, what are the tubes glowing green in the middle of the picture? [s...
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