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Old 25th April 2004, 11:40 AM   #1
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Question 200-300w solid state bass amp plans?

Hi all, my son is a bass player who dosn't earn a lot of money at his "real" job, and has asked me to make him a bass amp in the 200- 300w range. Although the purists would suggest a valve amp, I am more interested in buildig a solid state amp.
I am a radio electronics hobyist who has built and repaired many high powered transmitters etc over the last 25 years, so the construction of this amp should not be a problem, except for locating suitable circuit diagrams etc.
If you know of any suitable circuits could you please post the links for me here ..... many thanks in advance
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Old 25th April 2004, 02:05 PM   #2
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Hi,

Check ww.sound.au.com for some ideas for such a project.
Regards,
Thijs
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Old 25th April 2004, 02:23 PM   #3
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mike~! if ur son (like me) doesn;t really use the tone controls...coz it's a bass guitar...you could use a bridged parellel schematic...wire a few LM3875s together for 200W...check out ap note 1192 on national's webby...
http://www.national.com/an/AN/AN-1192.pdf
Look for 200W BPA
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Old 25th April 2004, 03:24 PM   #4
sreten is offline sreten  United Kingdom
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I'll just note a good sounding transistor musical amplifier
for bass is is nothing like a good hifi amplifier in design
or construction.

The feature set you need is quite alien to a hi-fi designer.

TBH IMO its simply not worth trying to build an amplifier
with what is available out there second-hand, and I've
never seen decent published plans for a bass amplifier.

My Peavey mkIII bass head I bought for 120. Its great,
and built like a tank, with a massive heatsink (15"x4"x1")
and eight output transistors for its 175W/ 4 ohms rating.
It also has a seriously large overspecced transformer,
no wonder its still going strong after 20 years or so.

It also has a sound I like, but not remotely hi-fi in nature,
and also has an excellent feature set, input matching,
tone shaping, shelving tone controls + graphic EQ,
effect send/return and a mandatory feature for bass
amplifiers - a compressor to avoid clipping at high levels.

Buy something designed to to the job well, IMO.

sreten.
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Old 25th April 2004, 11:21 PM   #5
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Thanks fellas for your replies. I will be looking around on the secondhand market to see what,s around, but failing that I will be making something to do the job. I have already looked at the
www.sound.au.com site and found a 100w amp schematic, but aparently more power is required. I will look into modifying this design for higher power output.
Again thanks for the help
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Old 26th April 2004, 09:29 AM   #6
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there is actually a 500W specifically desined for bass reproduction...runs class B...
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Old 27th April 2004, 12:00 AM   #7
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where would the circuit be for the 500w bass amp???
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Old 27th April 2004, 09:58 AM   #8
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it's found here
http://sound.westhost.com/project68.htm
A PCB is available from Rod himself...
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Old 27th April 2004, 10:04 AM   #9
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I feel that there is a misunderstanding. An amp for the bass guitar was aked for. The thing from Rod Elliott is a subwoofer amplifier. Not exactly the same thing.

Regards

Charles
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Old 27th April 2004, 10:07 AM   #10
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I know it ain't but I suppose he could go a bit further and make one outta it...if you get what I mean...it just doesn't have the right processing and tone controls...which shouldn't be too difficult...
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