L20 V8

ljm_ljm · 01:07 PM

The new version I test it will is the top level of the power amplifier simulation power amplifier.

It USES four to power tube. Positive, the reverse side.

Tests used only 2 to transistor output.

It will be a perfect power amplifier.

ingenieus · 8th November 2011, 09:00 AM

Please tell us more.

ljm_ljm · 9th November 2011, 03:03 PM

it is about 250W 8R (+ -70V）
Four double transistor of the power output. Each circuit board.

Each level of all use CFP.

ingenieus · 10th November 2011, 07:05 AM

Can you post a circuit diagram, please?

teslar · 11th November 2011, 11:56 AM

Please showe schematic and pcb layout.
Regards.

astankov · 11th November 2011, 01:27 PM

I'm interested also to see a schematic and PCB if possible.

Regards!

ljm_ljm · 18th November 2011, 02:05 AM

The new board arrived.
It will give the maximum brilliance. All of the power amplifier

Its high frequency sound like the ocl amplifier as 300 B.

With great power 250 W 8 R output.

Its temperature is very low.

ingenieus · 18th November 2011, 10:37 AM

The boards look nice.

That is about all I can say.

astankov · 21st November 2011, 05:17 PM

Interesting! Can't see a thermal sensor on the heatsink.
You say temperatures are very low - how did you bias the outputs?
And again can we see a schematic please?

rickedd46 · 13th December 2011, 12:15 PM

ljm_ljm,

How many versions of the L20 are there? I saw a L20, V7, V9 and others on ebay

Which one is better?

And why?

Thanks.

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8th November 2011, 09:00 AM	#2
ingenieus diyAudio Member Join Date: Apr 2011	Please tell us more.

9th November 2011, 03:03 PM	#3
ljm_ljm diyAudio Member Join Date: Sep 2006	it is about 250W 8R (+ -70V） Four double transistor of the power output. Each circuit board. Each level of all use CFP.

10th November 2011, 07:05 AM	#4
ingenieus diyAudio Member Join Date: Apr 2011	Can you post a circuit diagram, please?

11th November 2011, 11:56 AM	#5
teslar diyAudio Member Join Date: Nov 2006	Please showe schematic and pcb layout. Regards.

11th November 2011, 01:27 PM	#6
astankov diyAudio Member Join Date: Dec 2009 Location: Pernik	I'm interested also to see a schematic and PCB if possible. Regards!

18th November 2011, 10:37 AM	#8
ingenieus diyAudio Member Join Date: Apr 2011	The boards look nice. That is about all I can say.

21st November 2011, 05:17 PM	#9
astankov diyAudio Member Join Date: Dec 2009 Location: Pernik	Interesting! Can't see a thermal sensor on the heatsink. You say temperatures are very low - how did you bias the outputs? And again can we see a schematic please?

13th December 2011, 12:15 PM	#10
rickedd46 diyAudio Member Join Date: Mar 2007	ljm_ljm, How many versions of the L20 are there? I saw a L20, V7, V9 and others on ebay Which one is better? And why? Thanks.