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I've owned three different Walter Woods Amplifiers, a original MI-100-0 from October of 1970, a MI-400-8 from 1992 that I sold on TB, and a early Electroacoustic Ultra that I still own.
They're incredible amplifiers, great tone, longevity, and durability. Unfortunately, they're difficult to repair because Walter never published schematics. Walter can repair most of them,
but as time moves on some of the older models just can't be repaired. An example would be the MI-225-8 because it has two analog power amplifiers running off a single SMPS that
Walter is unable to built anymore.
I've owned three different Walter Woods Amplifiers, a original MI-100-0 from October of 1970, a MI-400-8 from 1992 that I sold on TB, and a early Electroacoustic Ultra that I still own.
They're incredible amplifiers, great tone, longevity, and durability. Unfortunately, they're difficult to repair because Walter never published schematics. Walter can repair most of them,
but as time moves on some of the older models just can't be repaired. An example would be the MI-225-8 because it has two analog power amplifiers running off a single SMPS that
Walter is unable to built anymore.
as time moves on some of the older models just can't be repaired. An example would be the MI-225-8

I sold mine and got an Electracoustic because of worries about repairs, but I have to say I liked the old one better for the different channel voicings.
Funny thing is the old one never broke down, but the new one has been repaired twice![]()


I sold mine and got an Electracoustic because of worries about repairs, but I have to say I liked the old one better for the different channel voicings.
Hi, what were the differences between the channels? One for upright bass?
I have an old 225. One channel is flatter response, one has more mids when both eqs are set flat.
I only found that the high frequency through WW is more "clear and powerful", and it has not reached the range I can't bear. I've tried the bass of ash + Maple FB,It's true that there will be a brighter and sharper high frequency, but I can deal with it by moderately attenuating the tone and high frequency on the bass. Maybe it's because of different pickup types, or wood and preamp?Yes, one was better for upright. The EQ circuits were different. I wonder which circuit Walter used in the single channel amps.
To my ear the Electracoustic sounds brighter overall and I have to dial down the high mids more.