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
http://sklep.toroidy.pl/en_US/p/TTG-EL34PP-Tube-output-transformer-for-2xEL34-Push-pull-or-similar/562
really good stuff, the price/quality is very good.
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I do not know about sending prices to NOR
Thanks for the comment and link.
I am looking for actual test results, but did not find any from that forum.
Do you have own experience ?
special winding
Unfortunately I have not used/measured this new transformer. I got however interested when I saw the picture at the manufacturers web pages
http://sklep.toroidy.pl/userdata/gfx/39223113a58e1a65cfb1d829ca30686b.jpg
Patented technology was also mentioned there. I assume this is the patent WO2014116127.
Patent WO2014116127A1 - High voltage serial toroidal transformer - Google Patents
Espacenet - Bibliographic data
Patent seems to be the sectional winding. It is easily understood that you can achieve excellent insulation, excellent symmetry and low capacitance with this construction. I however started to how good coupling between the windings you can get with this kind of construction. All of the coupling goes "via iron core". The core properties must be critical in this kind of construction.
Do anyone have experience or background data about this type transformer winding / transformer construction?
Unfortunately I have not used/measured this new transformer. I got however interested when I saw the picture at the manufacturers web pages
http://sklep.toroidy.pl/userdata/gfx/39223113a58e1a65cfb1d829ca30686b.jpg
Patented technology was also mentioned there. I assume this is the patent WO2014116127.
Patent WO2014116127A1 - High voltage serial toroidal transformer - Google Patents
Espacenet - Bibliographic data
Patent seems to be the sectional winding. It is easily understood that you can achieve excellent insulation, excellent symmetry and low capacitance with this construction. I however started to how good coupling between the windings you can get with this kind of construction. All of the coupling goes "via iron core". The core properties must be critical in this kind of construction.
Do anyone have experience or background data about this type transformer winding / transformer construction?
I have exchanged emails with this company. Their turns ratios were off and then they "fixed" them. However, they insist to specific turns ratio at 1/4 the impedance, i.e. B+ to plate yet (apparently) they reflect the 8 ohm secondary back to the full plate-to-plate when specifying 6k6 impedance.
I too would like to see a data sheet.
As an alternative, has anyone used these Amplimo's at also $69 each (less VAT).
3A524UL push-pull transformer with UL-taps
This is so called segmented toroid and I am in doubt it is patentable since I have seen similar winding diagram (with all design formulas) in Russian literature published 40 years ago. May be patent author enhanced something but the basic (and main) idea is the same.
This kind of construction usually used in high-frequency/high-voltage units, offering both very low inter-winding capacitance and low leakage inductance.
There is even a very interesting GM70 SE OPT:
http://sklep.toroidy.pl/en_US/p/TTG-GM70SE-Tube-output-transformer-for-GM70-SE-/564
It not would be 6.1k too low for primary? Due hi DHT.
http://sklep.toroidy.pl/en_US/p/TTG-GM70SE-Tube-output-transformer-for-GM70-SE-/564
It not would be 6.1k too low for primary? Due hi DHT.
Last time I heard about the Amplimo's I think it was to say that they had very poor high frequency performance, bad design leading to high capacitance. Cannot confirm this though.
These one's look as though they should perform well with their sectionalized windings to keep the capacitance down.
Shoog
Both are very good for sound quality. These should be some of the best OT you will hear if you can keep DC out of them.
Shoog
Shoog, maybe you are thinking about the now discontinued Antek output transformers. They did have very poor high freq response.
Also, to be clear, the Toroidy transformers have the "sectional" windings, not the Amplimo's correct?
They have a inrush limiter:
http://sklep.toroidy.pl/en_US/p/Inrush-current-limiter-for-high-power-transformers/454
It is suited for tube amps??
http://sklep.toroidy.pl/en_US/p/Inrush-current-limiter-for-high-power-transformers/454
It is suited for tube amps??
You could use it for a tube amp but its really meant for very large toroids and large filter caps. I'm willing to bet inside is a simple $2 thermistor.
Correct it was the Antek with the poor FR. My mistake.
Yes its the Toroidy transformers with the sectional windings.
I think the only real issue there might be is have they scrimped on the cores. The Piltrons are enormous for their power capability because they specifiy down to really low frequencies. These one's look as though they might just be using normal power transformer size cores which would mean that frequency would fall off below 50hz and distortion would rise. Since this is the really expensive part of the build its probably where they cut corners.
Shoog
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It might be or not. Depends on how many turns as well.
The Plitron's are big also to keep losses to a minimum, possibly the lowest you can find around, not because on a smaller core it's not possible to get enough power handling and good FR. If a more than adequate insertion loss of 0.25-0.3 dB is targeted rather than 0.15-0.2 dB then it is possible to make the transformer on a smaller core and the performance can be very good anyway. Between 0.2 and 0.3 dB insertion loss it is like splitting hairs from a practical point of view....IMHO
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