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 Forum: Audio, radio, and electronics   Topic: Some amps of mine

 Post subject: Re: Some amps of mine
Posted: Sun Jul 01, 2018 5:46 pm 

Replies: 2
Views: 68


Note the discussion of the metal cover and the microphonic 12ax7 tubes here http://audiokarma.org/forums/index.php?threads/jangly-6-string-sound.730945/ I have to put some microphonic ...

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

Posted: Mon Jun 18, 2018 5:55 pm 

Replies: 41
Views: 20919


... that I read the most, was a tube specs' book. I read it and dreamed of having and using all that tubes. Now I use military tubes that were unobtanium then, but cheap today on ePay. :D

 Forum: Audio, radio, and electronics   Topic: Gubernator - 71 single ended amplifier

Posted: Thu Jun 07, 2018 2:04 pm 

Replies: 5
Views: 739


As you can see from the picture, I used SMPS to power filaments of output tubes. It produced clean, well filtered DC for minimum of hum and sag, and greatly decreases weight and size of ...

 Forum: Audio, radio, and electronics   Topic: "Desirable even order harmonics", my ass! :-)

Posted: Mon May 14, 2018 5:17 pm 

Replies: 0
Views: 128


... symmetric, some even order harmonics get decreased in level. It has nothing to do with vacuum tubes, solid state devices, or even transformers. It is about symmetric distortions! How to get them? ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 71 single ended amplifier

Posted: Mon May 14, 2018 1:35 pm 

Replies: 5
Views: 739


... But the principle is the same, and there are several ways to apply local feedback around output tubes. If you want an example of nested feedback loops, look at SpaceX landing. It cant be possible ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 71 single ended amplifier

Posted: Sun Jan 07, 2018 1:54 am 

Replies: 5
Views: 739


... nasty sounding distortions, it is the usual way to build them: 2 or 3 triode stages depending on tubes, no or little feedback. As the result, they have reputation of amps good for audiophile recordings ...

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

 Post subject: Re: PP UL GU50
Posted: Thu May 30, 2013 5:24 pm 

Replies: 5
Views: 4502


... 3 go to output stage, to the same points go parallel feedback by voltage from anodes of Gu-50 tubes. I ordered custom transformers from Edcor. 2x285 V secondary for B+, 66V for bias, 2x12.6 V ...

 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: 4502


... Look at Pyramid schematics, I used there feedback from anodes to first grids of Gu-50 tubes. It is better than UL with feedback to screen grids. More flexible, more linear, and you can ...

 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: 4502


... setting, some values of voltage to verify my prototype. If I not understand the curves of the tubes, I know read a schema and realize it. A brief overview of some achievements (thank again Elektor ...

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

Posted: Mon Jan 28, 2013 6:16 pm 

Replies: 35
Views: 15041


... corresponding MOSFET and some other components. But you may find it usable to power preamp tubes by clean stabilized voltage that depends on Zeners used. I plan to use this PCBs for other projects ...

 Forum: Audio, radio, and electronics   Topic: 6p15p data данные 6П15П

Posted: Tue Jan 15, 2013 7:50 pm 

Replies: 1
Views: 2453


... размере кликните на неё. http://wavebourn.com/gallery/tn-tubes/6p15p-1.gif http://wavebourn.com/gallery/tn-tubes/6p15p-2.gif http://wavebourn.com/gallery/tn-tubes/6p15p-2.jpg ...

 Forum: Audio, radio, and electronics   Topic: Line array from microphone capsules...

Posted: Sun Mar 18, 2012 11:47 am 

Replies: 18
Views: 6296


... be 420V regulated by pass regulator. Both 6.3V windings in series to power filaments of 12L6GT tubes on the 2'nd floor of SRPP. Rectified by pair of Shottky diodes it will be something like 8V ...

 Forum: Audio, radio, and electronics   Topic: Monster tube project

 Post subject: Re: Monster tube project
Posted: Fri Dec 23, 2011 8:28 pm 

Replies: 9
Views: 3867


... About 12P17L, it is a very good tube. But 4P1L tube is exceptional Look how much 45 and 2A3 tubes cost, and how much do you think 4P1L should cost to match the price/quality criterion? Will ...

 Forum: Audio, radio, and electronics   Topic: Monster tube project

 Post subject: Re: Monster tube project
Posted: Mon Dec 05, 2011 11:14 pm 

Replies: 9
Views: 3867


quikie22 Wrote:

Received the tubes yet? Any good?


Not yet.

 Forum: Audio, radio, and electronics   Topic: Monster tube project

 Post subject: Re: Monster tube project
Posted: Mon Dec 05, 2011 8:45 pm 

Replies: 9
Views: 3867


Received the tubes yet? Any good?
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