Calculating output transformer impedance

Submitted by costas on Mon, 26/12/2011 - 14:35

How to calculate the output transformer impedance of an OPT with unknown values

Working with tube amps you may need to calculate the output transformer impedance especially when we have an old transformer or a transformer with unknown values.
All we have to do is to calculate the turns ratio of the transformer. To do this we need an AC voltage source and an AC voltmeter.
So we apply an AC voltage to the primary of the transformer and we measure the output voltage to the secondary.

Amp tubes history

Submitted by costas on Mon, 26/12/2011 - 14:24

Until the invention of the transistor in 1947, all practical amplifiers were made of thermionic tubes.

The simplest tube was invented by John Ambrose Fleming while working for the Marconi Company in London in 1904 and named the Diode, as it had two electrodes. The diode conducted electricity in one direction only and was used as a radio detector and a rectifier.

Flac download from HDtracks

Submitted by costas on Mon, 26/12/2011 - 14:20

"If you've only heard crippled digital files (whether by DRM or lossy MP3), you need to check out the Ultimate Download Experience to hear what you've been missing." - Wes Philips, Stereophile Magazine

Download in FLAC audio format from LINN records

Submitted by costas on Mon, 26/12/2011 - 14:17

LINN records ( audiophile recordings) goes high resolution format ! Studio master recordings for the audiophile fanatics are now available. ( download FLAC audio format, studio master FLAC or CD quality FLAC ) More information visit linnrecords web site

DIY horn loudspeaker review

Submitted by costas on Mon, 26/12/2011 - 02:02

After living with my DIY Back Loaded Horn loudspeakers for more than 2 years, I think its time to share my listening impressions with you.

First of all I recommend you ( if you are planing to build this design), to take the time to experiment with setup and placement to get the best of this kind of speakers. The sound produced by these specific BLH's is affected both by the behavior of the speaker in the room and the size of the room.

Tube amp quality at a price of a svetlana 6550?

Submitted by costas on Sun, 25/12/2011 - 02:27

If you wonder why this small digital amplifier is presented in a Web page with tube amplifiers, the answer is that TA-10 performs like tube amps !
In recent years in my home there was no solid-state amplifier. All my amps are tube amps. Some time ago I listen about this small digital amplifier and decided to buy it.
Based on the integrated circuit tripath TA2024 this little amp impressed me! Clear voices and impeccable music quality.

Why to build tube amps ?

Submitted by costas on Sun, 25/12/2011 - 02:13

...Some audiophiles state that the sound produced with tube amps is more natural than the sound from typical transistor amplifiers, and for this reason more satisfying. Typically, in sound reproduction systems, accurate reproduction of the sound of the original recording is the goal; gross distortion is something designers do not deliberately seek to introduce.

Tube amp design and DIY audio projects

Submitted by costas on Sun, 25/12/2011 - 02:11

The electron vacuum tube is a marvelous device. It makes possible the performing of operations with precision and amazing in conception, like in the vacuum tube audio amplifiers.
I believe that this web site is the most practical way to introduce a number of tube amps DIY audio applications for those who not only like to construct but listen to music as well.