I find it really really good. An alive amplifier with low bias current consumption! It's always a matter of taste. By example I find UCD amplifier flat and borring, but often use them in my amplifiers because it's fun to deal with!
What is your favorite amplifier ? I always want to try new things.I find it really really good. An alive amplifier with low bias current consumption! It's always a matter of taste. By example I find UCD amplifier flat and borring, but often use them in my amplifiers because it's fun to deal with!
What is your favorite amplifier ? I always want to try new things.
😊
Yes I live in Toulouse in France. Tubes are often really pleasant to listen! I just owned hybrid amplifier but never real valves amplifier with output transformer!
JLH69 is so many times quote as really good amplifier, I would like try it one day but I don't like high bias current and big consumption one! 😒
JLH69 is so many times quote as really good amplifier, I would like try it one day but I don't like high bias current and big consumption one! 😒
NAD 3400.
It's my challenge to learn and repair.
Started with recap.
Then some pwr tr stopped working....
Have 4 off them though. Started recap one of the working ones.
15000uf filter caps in the low rail pwr. Instead of 10000uf.
It's a mess with wires everywhere in this amp, so i will try sort them out, and move them under the board instead.
Waiting for parts,
It's my challenge to learn and repair.
Started with recap.
Then some pwr tr stopped working....
Have 4 off them though. Started recap one of the working ones.
15000uf filter caps in the low rail pwr. Instead of 10000uf.
It's a mess with wires everywhere in this amp, so i will try sort them out, and move them under the board instead.
Waiting for parts,
Attachments
Attachments
Hi to all,
here I share my realization of the DENON PMA-SA1.
Input stage and VAS are Sony's style circuits.
The output stage is a UHC Mos Bootstrapped Cascode as in DENON top amplifiers.
Enrico
here I share my realization of the DENON PMA-SA1.
Input stage and VAS are Sony's style circuits.
The output stage is a UHC Mos Bootstrapped Cascode as in DENON top amplifiers.
Enrico
Attachments
Some of my DIY amplifiers - preamp, poweramp and phono preamp.
My 2x250W/4ohm BJT amplifier based on @DouglasSelf blameless topology. More here:
https://pmacura.cz/DIY_250W_4ohm_amplifier.html
https://pmacura.cz/DIY_250W_4ohm_amplifier.html
Attachments
Hey, below is my recently built amp with autotransformers 2x300W into 2/4/8R load...
THD: 0,001% at low power and about 0,005% at full power.
SR: 25V/us
FR: 3Hz-160kHz /-3dB full power low frequency limit is around 20Hz, below that output cores saturates
You can see more images here in gallery: https://postimg.cc/gallery/FzmNFLF
And more measurements, spectrum and frequency extremes here: https://postimg.cc/gallery/n78Yt41
THD: 0,001% at low power and about 0,005% at full power.
SR: 25V/us
FR: 3Hz-160kHz /-3dB full power low frequency limit is around 20Hz, below that output cores saturates
You can see more images here in gallery: https://postimg.cc/gallery/FzmNFLF
And more measurements, spectrum and frequency extremes here: https://postimg.cc/gallery/n78Yt41
My goodness
the build quality of that NAD3400 is absolutely atrocious for a commercial product. It looks like the accountants were at work in cutting corners for production. I would be ashamed to let such a product out under my name. Compare it with some of the excellent so-called 'amateur' amplifiers build and presented by forum members here
Good luck in trying to get it working
It was a challenge, but now it's working condition again.
Nothing wrong with the build quality, despite its age, still sound great.
More bad engineering and planning where to put all those wires...
Not only nad from that period...
The fault was easy fix after finally found it.
Now it's modified with a BT receiver inside.
And some other mods , beside a full recap. It was a personally challenge, and I got through it
Attachments
WIP Class AB 2x50W + input selection + speaker protection and delay:
