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ljm_ljm 7th November 2011 01:05 PM

L20 V8
1 Attachment(s)
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.

astankov 11th November 2011 01:27 PM

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


ljm_ljm 18th November 2011 02:05 AM

1 Attachment(s)
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


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

Which one is better?

And why?


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