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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: 21856


... feedback for minimum of distortions on all powers up to clipping, but still get controlled ... with more efficient power output. Screen grid supply is regulated, using Zener string and MOSFET, ...

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

Posted: Mon Mar 04, 2013 12:23 pm 

Replies: 35
Views: 16138


... price will be $9.60 for 3 boards for complete power supply: inrush current limiting board, high voltage rectifier ...

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

Posted: Mon Jan 28, 2013 6:16 pm 

Replies: 35
Views: 16138


... better! I will have soon PCBs available for power supply designed for Pyramid amps. Probably kits with all parts ...

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

Posted: Mon Jan 28, 2013 12:51 pm 

Replies: 35
Views: 16138


... or apply negative bias to the screen from power supply, otherwise output resistance is huge and voltage amplification ...

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

Posted: Sun Mar 18, 2012 11:47 am 

Replies: 18
Views: 6700


... rectified. I will split it on 120V (negative supply) on a shunt regulator in series with load, ... regulator. Both 6.3V windings in series to power filaments of 12L6GT tubes on the 2'nd floor ...

 Forum: Audio, radio, and electronics   Topic: Sub-miniature guitar tube amp

Posted: Tue Sep 13, 2011 10:27 am 

Replies: 65
Views: 24398


... capacitance (350uF) and lack of choke of the power supply. Will try bypassing the GU-50 cathode resistor to reduce ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Fri Jun 17, 2011 3:07 pm 

Replies: 54
Views: 25169


... of my MOSFETS kept blowing in my regulated power supply too as mentioned in my post in the other thread. The ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Fri Jun 17, 2011 9:21 am 

Replies: 54
Views: 25169


... to return back to the project, and redesign power supply completely. It was PITA to unbolt all the assembly in ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Sat Jun 04, 2011 3:13 pm 

Replies: 54
Views: 25169


Power supply with all stabilized voltages is ready. Forgot about bleeding resistors, it is not good when rectified voltage is 800V!

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Thu Jun 02, 2011 11:59 am 

Replies: 54
Views: 25169


... I made. I've found a donor for heatsink for power supply and fixed it on chassis: 40W of power dissipated by PS ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Tue Apr 19, 2011 11:39 pm 

Replies: 54
Views: 25169


... wiring had been used. It is regular PCB for power supply. Some software does it wrong, assuming that it does not ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Mon Apr 18, 2011 2:11 pm 

Replies: 54
Views: 25169


Done with PCB for 12.6V and -80V power supply. Also, the PCB contains inrush current limiter (20 Ohm resistor ...

 Forum: Audio, radio, and electronics   Topic: Gubernator - 8: parallel SE GU-50 amp

Posted: Fri Apr 15, 2011 11:37 am 

Replies: 54
Views: 25169


Here is the sketch of B+ power supply:


Image

 Forum: Audio, radio, and electronics   Topic: Gubernator-7: 4P1L Single Ended Amplifier Design

Posted: Tue Apr 12, 2011 1:54 am 

Replies: 144
Views: 64112


... to the limited headroom from the tube's low power. Would have liked to do the same thing with ... to get a transformer for negative voltage supply, but decided that maybe should try the interstage ...

 Forum: Audio, radio, and electronics   Topic: Gubernator-7: 4P1L Single Ended Amplifier Design

Posted: Thu Apr 07, 2011 8:22 am 

Replies: 144
Views: 64112


Yes with the GU-50 amp, the CF allowed a higher power output. So, yes I was considering a cathode ... bias voltage of CF. Any suggestions for single supply voltage CF? I have 6N1Ps, 6N6Ps, 6P15Ps/EL83 ...
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