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Old 4th April 2006, 03:14 PM   #1
ZuMbAiU is offline ZuMbAiU  Bulgaria
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Default The best cheap and simple transistor amp?

I want to make any cheap transistor amplifier.I look for any very simple amp with good sounding like the DoGC,but this amp from WidowMaker is very commercial.I look for may be 25-30 W @8 Ohms from mono block. May be the reply is under my nose,but I can`t find it,help me.
I have one GainClone,but I look for a little natural sounding.
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Old 4th April 2006, 04:14 PM   #2
edl is offline edl  Hungary
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Hi,

there is a commercially manufactured audiophile hungarian amplifier, called Canopus.
It can be easly modied. Better transistors, good passive components, etc...
I think it's so simple.

Regards,
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Old 4th April 2006, 07:01 PM   #3
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Quote:
Originally posted by edl
Hi,

there is a commercially manufactured audiophile hungarian amplifier, called Canopus.
It can be easly modied. Better transistors, good passive components, etc...
I think it's so simple.

Regards,

Bias trimmer is potential fire, but the amp is nice for simplicity
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Old 5th April 2006, 04:09 AM   #4
CBS240 is offline CBS240  United States
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replace that BD139 Vbe mult. with a BD140(reverse emitter & collector of course) Maybe place 3 forward bias diodes from E to C of that BD140 to limit bias.
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Old 5th April 2006, 05:32 AM   #5
hacknet is offline hacknet  Singapore
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i think the pot in the vbe mulitplier can swap places with the resistor to make it safer...
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Old 5th April 2006, 07:13 AM   #6
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Hungarian people don't make a short at output ?
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Old 5th April 2006, 08:33 AM   #7
KLe is offline KLe  Australia
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Default Re: The best cheap and simple transistor amp?

Quote:
Originally posted by ZuMbAiU
I want to make any cheap transistor amplifier.I look for any very simple amp with good sounding like the DoGC,but this amp from WidowMaker is very commercial.I look for may be 25-30 W @8 Ohms from mono block. May be the reply is under my nose,but I can`t find it,help me. I have one GainClone,but I look for a little natural sounding.
Hi ZuMbAiU
If you would like a very natural and excellent sounding amplifier, that is also very affordable, then you should have a look at the Simple Killer Amp(SKA) by Greg Ball. Just have a look at the Simple Killer Amp Listening Thread and the Simple Killer Amp Constructor Thread.

Also, have a look at his website (click on GURU) http://members.dodo.com.au/~gregball/guru_001.htm
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Old 5th April 2006, 09:16 AM   #8
edl is offline edl  Hungary
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You are all right about Vbe multiplier. When this amp is DIY-ed, than a safer Vbe mult. needed.

Spec's and other infos in the manufacturer page:
In english: http://www.heedaudio.hu/en/prod_el.html
Deutsch: http://www.heedaudio.hu/de/prod_el.html
Magyarul: http://www.heedaudio.hu/hu/term_el.html

There are several modified version of this amp. For example using simple darlington output instead of the CFP, improve PSRR with two diodes, resistors and elkos, etc... It's your choice to make it better.
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Old 5th April 2006, 10:29 AM   #9
AndrewT is offline AndrewT  Scotland
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Hi,
the posted schematic is based on sziklai (compound follower) output stage.
There are many warning that this is more difficult to set up.

Maybe a more easily set up emitter follower pair would be better for a beginner.

Yes, swap the pot for the lower resistor and up the resistor from 220r to 1k0.
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Old 5th April 2006, 11:06 AM   #10
tubee is offline tubee  Netherlands
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John Linsley Hood his amps?

I have build 2 monoblocks, has only 4 transistors/channel
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