Made in China and US $ 395 with used tubes.
Well, I see your point, but with everything included I thought it might be OK. Case, transformer, terminals, remote control, etc...
I guess I'd have to spend quite a bit more than that if I were to buy just the bare PCBs from China and all the casework, components and other hardware from the US or locally. (?)
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Made in China and US $ 395 with used tubes.
Well, he says the tubes are tested, but the kit is complete with a chassis box, transformers, connectors and other stuff.
I get outstanding help from my suppliers in China. They are prompt with their replies and very courteous.
It would depend on the quality of the box mostly. A regular 1U rack width Hammond box is $90, for example. Fancy preamp boxes can be hundreds of dollars, particularly if they are made in USA.
Wow. Thanks!I'll take a closer look at it later today, an get my head around how it works. (I told you I'm a newbie.)
Well, you don't have to get into design in order to build what you want. It's up to you how deeply you want to walk into this arena.
You'd need some complex switching arrangement to provide both balanced and unbalanced inputs to that. It also has high output impedance. This isn't a design thread as far as I know. He just wants to something easy and mostly ready made I think.
Well, I sort of see the "not DIY enough" point, and I'd certainly be capable of soldering "through hole" components to a PCB and wiring the PCBs, switches and other parts together in a case myself, but int that kit, the boards happen to be populated. The reason I mentioned these kits is that they seem like an easy way to get everything I need. Given that the components are decent, of course.
...And I'd probably get a better looking amp that way, FWIW.
What I'm afraid of is that I might get an ugly, noisy and expensive amp if I try to do it the "proper" way. Especially when I want both balanced and several single ended inputs on it.
I found an image showing my almost finished (for several years now) guitar amp as a reference. Not really that pretty:
http://www.breitzufahren.net/pics/p1_8.jpg
http://www.breitzufahren.net/pics/p1_7.jpg
...And I'd probably get a better looking amp that way, FWIW.
What I'm afraid of is that I might get an ugly, noisy and expensive amp if I try to do it the "proper" way. Especially when I want both balanced and several single ended inputs on it.
I found an image showing my almost finished (for several years now) guitar amp as a reference. Not really that pretty:
http://www.breitzufahren.net/pics/p1_8.jpg
http://www.breitzufahren.net/pics/p1_7.jpg
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It sounds like you'd be better off with a complete kit even if it's not ideal or perfect or totally awesome. Like I said, you can adapt an existing single ended kit to receive balanced inputs and to provide balanced outputs with a few transformers. Otherwise, you'd probably have to learn a lot more about circuit design.
Also, if a fully electronically balanced design is used, then you need much more complicated input switching and volume controls as well. My preference is to switch any balanced signal to single ended inside the box and then convert it back to balanced for the output for just these reasons.
Also, if a fully electronically balanced design is used, then you need much more complicated input switching and volume controls as well. My preference is to switch any balanced signal to single ended inside the box and then convert it back to balanced for the output for just these reasons.
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And it seems to me that you want to force him to learn new things. I'm not protecting him at all. His first post was clear to me that he just wanted something easy without getting deeply into design.
I don't remember if he stated the input impedance for his amplifiers. I thought they were solid state, which usually means an input impedance of 10kohms. He may not even know. At any rate, 2.1kohms is high for an output impedance.
I actually did.
This is straight from the designer, Per Abrahamsen, and I trust it's accurate.
There's no need to argue, guys. I appreciate all the help from all points of view. Both kinds of project are tempting, but right now, I'm leaning towards the instant gratification of a kit, or at least something based on circuit boards.
That being said; building something like described on artosalo's schematic sounds very cool, and I would like to try that as well, but maybe as my next project. Sometime after I get my gitar amp working, for instance.
I'm all for learning, of course, but a sucker for instant gratification as well. ;D
Concerning input impedance:
In general, for common cathode vacuum tube triode circuit 2.1 k output impedance is rarely low.
As I said above, 2.1 kohms output impedance is low for feeding 50 kohms load.
This 6N6P dif. amp. circuit can supply 6 Vrms to 50 kohms load with some 0.05 % THD.
Why would it need to have lower Rout ?
In general, for common cathode vacuum tube triode circuit 2.1 k output impedance is rarely low.
As I said above, 2.1 kohms output impedance is low for feeding 50 kohms load.
This 6N6P dif. amp. circuit can supply 6 Vrms to 50 kohms load with some 0.05 % THD.
Why would it need to have lower Rout ?
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