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Old 4th September 2007, 04:46 PM   #1
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Join Date: Jul 2002
Location: london uk
Default jl hood 75w amp(1972)

Having built jlh hood's 30w int amp (cir1980) would be intersted to hear if anyone has built his ealier 75w amp pub in hifi news 1972.Thanks.ps the input stage appears to be unbalanced?
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Old 4th September 2007, 05:51 PM   #2
Geoff is offline Geoff  United Kingdom
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Location: UK
For anyone interested, the schematic of both amps can be found here:

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Old 4th September 2007, 06:24 PM   #3
latala is offline latala  United Kingdom
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Join Date: Feb 2006
Location: staffordshire
I have built thr 75 watter it was good very good! I used the Powertran kit that was considered to be the Rolls Royce version .
I do in fact still have one about the house and have built many clones of it.
I still agree with a lot of the design criteria and feel that a design such as this with Baxendall diode compensation etc as valid also the fact that the VAS stage was isolated from the diff pair via a current booster helped to improve distortion figures below a then magical 0.01% mid band
As to the thirty watt amplifier this is very similar to a design that I have made many hundreds of times the themal stabilty of the output stage is superb
regards Trev
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