I have probably not spending enough time searching the forum.
A year ago I switched from normal SS amps to SE tube amps and liked the sound. Then I wondered why to don't see any SE SS amps out there. I am interested in how the "interface" from the output stage to the speaked is done.......to avoid DC on the speaker......without using large electrolytic capacitors.
I will perform some searcing........
A year ago I switched from normal SS amps to SE tube amps and liked the sound. Then I wondered why to don't see any SE SS amps out there. I am interested in how the "interface" from the output stage to the speaked is done.......to avoid DC on the speaker......without using large electrolytic capacitors.
I will perform some searcing........
Google the creator of Pass Labs, Nelson Pass, and you will find your answer. Most of the diy builds are Zen or Firstwatt clones. After a certain amount of time the Firstwatt amplifier schematics are released for the diy crowd.
FIRST WATT ARTICLES
FIRST WATT ARTICLES
No worries.
You'll find plenty of info that'll answer all your questions here, @diyaudio.com, in the PassLabs forum.
And @FirstWatt.com.
Takes some time but it's worth the effort.
Also there will be many knowledgeable souls willing to guide you in your endeavours.
(I know I might sound like a catholic priest but that was intentional).
You'll find plenty of info that'll answer all your questions here, @diyaudio.com, in the PassLabs forum.
And @FirstWatt.com.
Takes some time but it's worth the effort.
Also there will be many knowledgeable souls willing to guide you in your endeavours.
(I know I might sound like a catholic priest but that was intentional).
Not kits as such at the moment
There are extremely detailed build guides that are easy to follow that cover building and setting up the amps.
Also part lists with stockists.
Any problems can be addressed on the forums which have a large and active following.
The diyAudio build guides
There are extremely detailed build guides that are easy to follow that cover building and setting up the amps.
Also part lists with stockists.
Any problems can be addressed on the forums which have a large and active following.
The diyAudio build guides
A class amps are for sissies
I am interested in Single Ended configurations. Then you need 100% pure class A. There are other strange definitions of class A operations. In SE you get the real stuff.....
I wonder in some configurations are with output transformers rather than with capacitors. It should be possible if OT's are made for this purpose.
The Aleph series are Single-ended
http://www.firstwatt.com/pdf/prod_aj_man.pdf
Aleph J – diyAudio Store
Aleph J illustrated build guide
FIRST WATT ALEPH J
There is something to look at. Thank you for that.
They write "no capacitors in the signal path".
There is a schematic for the Alehp J amp. I can see I need to learn someting new how DC is avoided without a capacitor and without an OT. Q5, Q6 and Q7, Q8 is not in a PP configuration? but you call this Single Ended?
So if I learn how this curcuit is working it will be a big step forward.
A lot of heatsinks is needed. It is a big difference from tubes where the heat is radiated from the tubes. But that I was aware of.......
They write "no capacitors in the signal path".
There is a schematic for the Alehp J amp. I can see I need to learn someting new how DC is avoided without a capacitor and without an OT. Q5, Q6 and Q7, Q8 is not in a PP configuration? but you call this Single Ended?
So if I learn how this curcuit is working it will be a big step forward.
A lot of heatsinks is needed. It is a big difference from tubes where the heat is radiated from the tubes. But that I was aware of.......
My favorite of the SE Nelson offerings is the BA-1 using the BA-3 front end. I've built the F3, and Aleph series along with a few of the Zen series single ended but the BA-1 was, is, better to my ears with my speakers in my room.
http://www.firstwatt.com/pdf/art_ba1.pdf
http://www.firstwatt.com/pdf/art_ba_3.pdf
My build is a 3 output pair BA-1. Boards and j-fets available in the diyaudio store.
http://www.firstwatt.com/pdf/art_ba1.pdf
http://www.firstwatt.com/pdf/art_ba_3.pdf
My build is a 3 output pair BA-1. Boards and j-fets available in the diyaudio store.
Looks interesting. I have saved the links. I have a good damping factor compared to a SE tube amp.
How much ripple do you usually have on the PSU? .....is it down to a few mV ripple normally?
I am streaming music in 16 or 24 bit quality and the DAC has a large fixed output so I just use a passive preamp (10k Goldpoint stepped attenuator built into a DIY box). In my system this gives me the cleanest and most dynamic sound (300B SE amp in the moment). Will read about the BA1. Can see it requires some "big" hardware......
How much ripple do you usually have on the PSU? .....is it down to a few mV ripple normally?
I am streaming music in 16 or 24 bit quality and the DAC has a large fixed output so I just use a passive preamp (10k Goldpoint stepped attenuator built into a DIY box). In my system this gives me the cleanest and most dynamic sound (300B SE amp in the moment). Will read about the BA1. Can see it requires some "big" hardware......
I am using approx. 94 dB Open Baffle speakers. The 7-8 W the 300B can deliver are more than enough. I have not yet tried to drive it into clipping. My ears are going "bad" before then. Impressing how loud 7-8 W can play.......
These speakers:
OBL-15
....but built in 1 inch black MDF with some other minor modifications.
These speakers:
OBL-15
....but built in 1 inch black MDF with some other minor modifications.
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