As in a CCS loaded single output device?
VFET is close to the SIT-3 in terms of topology (AFAIK, i am very novice when it comes to SS circuits). I believe the ACA is the same concept. As is Hugh Dean's Alpha Nirvana.
A choke or CCS loaded paraFeed SE tube amp is the same family.
dave
If i wrote 'many' tube amps are classA instead of 'most' we would not have to go over the nonsense like AN39 and Vfet and ACA are the same family...
Probably scared the OP away. Quiet tube DHT SE amplification to drive horn drivers is quite possible, careful attention to detail is required.
My recipe is fixed bias 300B driven by led biased triode connected D3A (not recommended due to availability) loaded by a cascode ccs/ makes for a hybrid mu follower.
Coleman regulator for filament heating, fed from a regulated 8.5V supply. Bias is CRC filtered. D3A is AC heated.
The power supply and amplifier circuitry are on separate chassis.
The B+ power supply is CLCLC with SIC bridge rectifiers. C= 60uF, L = 2H
Drives 2440 on 2380 horn - about 114dB, and T825 horn tweeter at 110dB. Very quiet.
Output transformers are amorphous core types from Monolith Magnetics.
Possibly a Russian 6Z51P might be a good substitute for the D3A.
My recipe is fixed bias 300B driven by led biased triode connected D3A (not recommended due to availability) loaded by a cascode ccs/ makes for a hybrid mu follower.
Coleman regulator for filament heating, fed from a regulated 8.5V supply. Bias is CRC filtered. D3A is AC heated.
The power supply and amplifier circuitry are on separate chassis.
The B+ power supply is CLCLC with SIC bridge rectifiers. C= 60uF, L = 2H
Drives 2440 on 2380 horn - about 114dB, and T825 horn tweeter at 110dB. Very quiet.
Output transformers are amorphous core types from Monolith Magnetics.
Possibly a Russian 6Z51P might be a good substitute for the D3A.
Poor guy, he was just asking simple question. Ok, i am out of here, i do not fancy moderator call my post untrue
Especially after series of untrue statements
And i recommend AN39, yes i built it 🙂 but aleph j sounds better to me
Especially after series of untrue statements
And i recommend AN39, yes i built it 🙂 but aleph j sounds better to me
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Hi Kevin, that is very interesting. Do you have a published schematic? Maybe on your website?
BTW, I too use the 2380 horn with a 2445J. The 2445s go into breakup around 11 kHz, so a super tweeter might be nice. But it sounds so good that I am loathe to play with one right now. Those T825s are pricey! How do you like them compared to running the 2440s full out?
BTW, I too use the 2380 horn with a 2445J. The 2445s go into breakup around 11 kHz, so a super tweeter might be nice. But it sounds so good that I am loathe to play with one right now. Those T825s are pricey! How do you like them compared to running the 2440s full out?
Many is better than most, but the similarity of CCS loaded SE amps is nonsense?
As i said i am not all that up on SS so take a broader view.
I believe that ACA and SIT-3 are single stage devices, the VFET does have an inpiut board/stage.
dave
Im using a 350hz elliptical tractrix horn...this is somewhat bigger than the 2380a but smaller than the 2386 (all the 2" horns I have)...I dont know how to give 1 watt lol. Sens is likely ~112 but I dont know...the 108db listed for the Axi is on a seos 30 waveguide.
Am I going to have to build an amp? Is there a whole kit for the Aleph J? I am aiming for scientific idea of sound quality not "what sounds best"...neutral, uncolored. Does this An39 have a kit or assembled build? I've not built an amp before FYI...but I am down to try if you guys will baby sit me lol.
Please no one leave over a simple disagreement, please...
Just to give an idea how lost I am, I googled an39 amplifier, nothing relevant returned...
Am I going to have to build an amp? Is there a whole kit for the Aleph J? I am aiming for scientific idea of sound quality not "what sounds best"...neutral, uncolored. Does this An39 have a kit or assembled build? I've not built an amp before FYI...but I am down to try if you guys will baby sit me lol.
Please no one leave over a simple disagreement, please...
Just to give an idea how lost I am, I googled an39 amplifier, nothing relevant returned...
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Well that's rude, arrogant, and unwarranted, what makes you think I was commenting specifically on anything you said?
I commented as a member and not a moderator. I am entitled to express my opinion and experience just as you are.
You are free to stay or go as you choose.
The design is not on my long dead website, nor ever publicly available, that said send me a PM and we can discuss offline.
The 2440 struggles to make it flat to 8kHz so I have never tried to run it as part of a 2 way. The 2441 will however, and I think sounds a bit better than 2445 which I tried. I no longer have the drivers, but I do have the 'phragms which work fine in my 2440's but I prefer the 2440, it's a bit better at the bottom and mid portion of the range. The 2441 will run to about 15kHz but relies on diaphragm break up in order to do so, in order personal preference I would rate the 2440 better in the midrange when coverage above 7 - 8kHz is not required.
Above about 6kHz the T825 sounds better and I cross at 6kHz currently. The radiation patterns match fairly well both being bi-radial types.
The amplifiers drive the compression drivers directly - source impedance is something of a concern as these drivers were really designed to be driven by a perfect voltage source which doesn't describe my amplifiers.. The effect of varying load impedance can be greatly mitigated by using a lower impedance tap on the amplifier. (Sometimes some parallel impedance for load matching is helpful, but not always necessary.)
Your best chance of success is probably to build a few kits first and then build what you need once you have the experience. The amplifier I described isn't complicated but it's not a simple build either.
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The axi is 8ohms
The mid and bass channels are 16ohms, the bass can be ran into 4 ohms in parallel. I figured 16ohms was cleaner.
Ive got Crown CTS amps...the times Ive run measurements and toyed with it I was able to eq it and have headroom and no hiss, not dead quiet...quiter than the class d amps in my krk's...
Right, interacting with the impedance of a CD/horn is worthy of attention as the impedance variations are usually large and ugly. Damping factor alone isn't going to cover the topic.
Not to put you off because I drive my CDs from a finite Zo SET and I'm not the only one.
Not to put you off because I drive my CDs from a finite Zo SET and I'm not the only one.
I guess they don't sell these "finite Zo SET", I have to build it? What about the Chinese stuff the come sup on ebay?
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I just gotta make sure if I do SET that its in the fashion of uncolored sound not the kind that adds the harmonic distortion. I really have no idea...I see something like this Mini Stereo 6P6P Vacuum Tube Amplifier Class A Single-Ended Audio Amp Board 3Wx2 | eBay and don't know what to think. I have no insight into if input from a soundcard is going to be an issue etc etc...
I need to figure out the sensitivity....My guess is 112-11db
I need to figure out the sensitivity....My guess is 112-11db
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