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Forum: Analog Circuits Valve Amplifier - Röhrenverstärker


Author: Jubei Kibagami (joobei)
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Hello everyone,

I am interested in buying an entry-level valve amplifier. I don't have 
much requirements in terms of power. The room is not so big and I will 
be sitting 2-3m away from the speakers. I want to connect my computer 
for listening to music (losless, high bitrate jazz/soundtracks/world 
music) and to watch movies. Low-mid volume, nothing loud.

Could somebody plese recommend a pair of valve amp and speakers that is 
a good match? If that's not possible then just the valve amp.

Many thanks in advance,
Jubei

Author: Alex Rybin (Company: None) (rybin87)
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Hello. Your needs may be satisfied by a single-ended amplifier. One of 
the most common valve is EL84 (3-4 Watts of power), also it is a good 
sounding one. Why not to look simple schemes with this valve? Valve 
amplifiers are quite picky about speakers. Mostly they like full-range 
speakers (one driver).

: Edited by User
Author: Jubei Kibagami (joobei)
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Alex R. wrote:
> Hello. Your needs may be satisfied by a single-ended amplifier.
> One of
> the most common valve is EL84 (3-4 Watts of power), also it is a good
> sounding one. Why not to look simple schemes with this valve? Valve
> amplifiers are quite picky about speakers. Mostly they like full-range
> speakers (one driver).

Hello Alex! Thanks for your post. By "scheme" you mean find an amp that 
uses this valve? By full-range speakers you mean a speaker that has a 
wide frequency response? Apologies for the simple questions but I'm a 
bit of a noob.

Thanks in advance.

Author: Alex Rybin (Company: None) (rybin87)
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You're welcome.
1. Yes, you can find many amplifiers that use this valve. To get the 
most from valves, all the parts of an amplifier must be rather high 
quality.
2. Yes, that's right.

: Edited by User
Author: Jubei Kibagami (joobei)
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All my research so far brings up DIY kits and honestly I just want to 
buy an amp.
1. Are there any manufacturers that sell pre-built valve amps based on 
the EL84 at reasonable prices?
2. How would I go about matching an amp to speakers?

Author: voltwide (Guest)
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"scheme" stands for "schematics" or "circuit diagram". Wideband or 
full-range means a single speaker as opposed to a 2-way or 3-way system.

Author: luhe (Guest)
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see also thinks like this
Ebay-Artikel Nr. 191738306723

Author: Alex Rybin (Company: None) (rybin87)
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Some volume potentiometers in these KITs tend to fail after a while. 
Also you need to select a good output transformer. I'm not sure that 
modern stuff is good, while not being expensive. Maybe you should find 
old audio-transformers from a good tube radios - correct me, if i'm 
wrong.

: Edited by User
Author: Jubei Kibagami (joobei)
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Thank you all for the great advice but as I noted earlier, I am not 
looking for a kit. I want to buy a ready-made amplifier. One that has 
warranty etc.

Author: peda (Guest)
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You may look on old high class tube radio schematics.
E.g. the RFT radio "Beethoven" has an excellent sound.
I owned it as a schoolboy for 20,-M (former GDR bucks).
It has separate output stages for bass and treble, because it was easier 
to make transformers for a certain frequency in opposition to full 
range.
Also the tone regulator schematic works good.
Because the AZ12 was broken, I soldered into the AZ12 socket two 
1000V/1A Diodes with 100R in series.

Following the schematic:
http://www.gfgf.org/GFGF-Schaltplandienst/SternRad...

Author: peda (Guest)
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Jubei K. wrote:
> I want to buy a ready-made amplifier. One that has
> warranty etc.

Then I fear, you must spend a lot of money to get good quality.

I use a transistor amp (Onkyo) with digital input (Toslink) on the 
computer.
This prevent switch on click, ground loops, noise, humming and other 
hassle.

Author: combiner (Guest)
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