Toroidal OPT

[45]

Has any of you tried these ? Results ?

http://sklep.toroidy.pl/en_US/p/TTG-EL34PP-Tube-output-transformer-for-2xEL34-Push-pull-or-similar/562

I think, for less than 65 euros a piece, it is worth risking in case you don't get enough feedback. They look good.

 

[TrippleM]

€65 isn't much indeed but "they look good" isn't enough to know if they are really good.

A bit more information is necessary, core material; copper loss, power at 20Hz; square waves and a real frequentie plot for instance would be better. A 5Hz - 80KHz -3db transformer can still be bad sounding......

 

[45]

That's the risk.....
Otherwise, wanting real measurements and guarantee on rather tight average specs means more work that will make it more expensive. No escape.

 

[LinuksGuru]

A 5Hz - 80KHz -3db transformer can still be bad sounding......

80 KHz (-3dB) top frequency limit is not spectacular result, especially for toroid.
A typical push pull amplifier with 20dB NFB like Williamson may have stability problem.

 

[scooby555]

I tried these and really not satisfied , seems there is no airgap , they saturate quite clearly........might be a mnf misstake , toroidy did offer to take these back

i still have to tste the same size but different spec 211SE 150mA tranny that they really encouraged me to buy a pair as well , will see......

just going to hook them up instead of my Lundahl and see what comes out......

 

[scooby555]

We are speaking about this one :

Intended for Single Ended
Core type Toroidal
Ultralinear tap ---
Nominal Power 50W
Nominal anode current 150mA
Frequency bandwidth (-3dB) 18Hz-53kHz
Secondary Impedance 4 and 8 Ω
Primary Impedance 7,0 kΩ
Turns Ratio (Np:Ns) 41,83:1 (4Ω) , 29,58:1 (8Ω)

I did measure it , and maybe as i already wrote production misstake , seems like its a PP version as it should handle 150mA and it saturates clearly at 90mA