That's not bad at all!
I'm not an SE guy usually, but always wanted to try their toroids for an SE amplifier build. They don't have any US distributors, do they? Shipping might be a bear from Poland...
I'm not an SE guy usually, but always wanted to try their toroids for an SE amplifier build. They don't have any US distributors, do they? Shipping might be a bear from Poland...
The 6P3S is basically a 5881 or 6L6G. For a triode connected 6P3S I use 8k Raa. I assume that's about a 2k load single ended. And as mentioned, 64k Rp is for tetrode connection, for the 6P3S in triode, that falls to about 1k5-2k.
Yeah guys, I made many mistakes. I realised that recalculating and rewinding the transformer will be good idea. So, where to buy capacitor paper.for insulation and thin copper wire that can withstand high voltages?
Thanks for the useful info, appreciatted.
Poland always is a good surprise on the
audio parts market, plenty of options 🙂
One can not measure musical satisfation or the Acapulco sunset view, but paper is made from wood like wooden musical instruments, plastic has to do with oil and dead animals, not something good.
Should be said that plastic is cheaper and more heat resistant though.
Should be said that plastic is cheaper and more heat resistant though.
Just located some talk on transformers paper bobbins from guitarist POV though.
These Classic Tone transformers were used by Pete Millet 807 amp.
Paper Vs. Plastic
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this is discussion about tubes and winding a transformer, not about old good wood vs new terrible plastic 😀 😀 😀
Just like a $5000 power cord sounds better than a $2 one? I have some oceanfront property in Saskatchewan to sell you...
MIFA ,down load radiation Radiotron Designer's Handbook, 4th Edition - tubebooks.org
You'll find all about se transformer calculations .
You'll find all about se transformer calculations .
Plastic can be made without oil. A bad transformer design wound on a paper bobbin isn't going to compare well to a good transformer design on a plastic bobbin.
Kellog's paper any day, as the dielectric constant is lower than plastic. Hence lower capacitive losses. A well designed output tranny need only be moisture sealed on the ends, NEVER impregnate windings, as the varnish is as good as plastic dielectric.
Mains transfomers the opposite. Vacuum impregnate or dunk'em overnight to keep them quiet.
rJ
please stop spreading witchcraft bullsh*t.
forget about making own transformers. there is lot of important technical details, that trafo makers are not sharing with people (know-how and technical finesse).
you will make non fuctioning transformers, and lose money on parts.😱
toroid
TME - toroids with cathodic feedback windings.
I have tried these Transformers from TME - TTG-CFB6600PP, the results are promising. A perfect balance of the cathode currents with the automatic bias module is a prerequisite. 30Hz-20kHz at 50W (Ua 500V, 2xEL34)
TME - toroids with cathodic feedback windings.
I have tried these Transformers from TME - TTG-CFB6600PP, the results are promising. A perfect balance of the cathode currents with the automatic bias module is a prerequisite. 30Hz-20kHz at 50W (Ua 500V, 2xEL34)
EI type Power transformers can be used as SE OPTs... as can EI type PP OPTs. as long as they are well oversized.
I currently use 230v pri to 12.6vct 2A sec. Basically 25VA I run it with 50mA- el34/6l6 and 60mA- KT88/6550/6CB5/6CD6.
I run the secondary to the center tap using only half the sec. coil. This gives me about 37:1 ratio and approx 10.7k impedance.
Watch the 3rd order distortion figures using the trioda load line simulator as you increase voltage and impedance. Also watch your amperage variation become less from full volume to no volume.
KT88's at 530V B+, 55mA 8ohm with these transformers produced too much bass for the listeners wife. 6L6 at 45mA was the tube she preferred.
Here's the cool part... we hooked it up to run 4ohm floor standing Totems...
4ohm= 5.35k impedance... there was so much bass from the 6L6, I checked a few times to be sure the sub was off.
Really though... i have some tiny SE transformers that produce good bass... 14k impedance. Lots of copper...and only 130ohms resistance.
SE low power does not equate to weak bass. It's engineering, math, speaker choice, balance and realistic expectations If you want to rattle your windows, using SE triode mode...then get 813's with enough voltage to make your visitors nervous and plenty of iron to warrant wheels one the bottom of your amp... (I will be doing this someday) or do a PP amp or SS... don't expect an EL34 to do it unless you have 120dB sensitive 15" woofers with low frequency horn and horn tweeters...or a really small room with old thin windows- It truly is about realistic expectations... and often times, you will be surprised at how much bass you do get, and how little bass truly is required to be immersed in music.
I am going to be experimenting with split core multiple primary and secondaries. My guess is wiring at least one sec. in between 2 primaries should reduce capacitance.
Toroidal power transformers cannot be used SE as they are very efficient at saturating. Exquisite high frequency response and absolutely no bass.
I currently use 230v pri to 12.6vct 2A sec. Basically 25VA I run it with 50mA- el34/6l6 and 60mA- KT88/6550/6CB5/6CD6.
I run the secondary to the center tap using only half the sec. coil. This gives me about 37:1 ratio and approx 10.7k impedance.
Watch the 3rd order distortion figures using the trioda load line simulator as you increase voltage and impedance. Also watch your amperage variation become less from full volume to no volume.
KT88's at 530V B+, 55mA 8ohm with these transformers produced too much bass for the listeners wife. 6L6 at 45mA was the tube she preferred.
Here's the cool part... we hooked it up to run 4ohm floor standing Totems...
4ohm= 5.35k impedance... there was so much bass from the 6L6, I checked a few times to be sure the sub was off.
Really though... i have some tiny SE transformers that produce good bass... 14k impedance. Lots of copper...and only 130ohms resistance.
SE low power does not equate to weak bass. It's engineering, math, speaker choice, balance and realistic expectations If you want to rattle your windows, using SE triode mode...then get 813's with enough voltage to make your visitors nervous and plenty of iron to warrant wheels one the bottom of your amp... (I will be doing this someday) or do a PP amp or SS... don't expect an EL34 to do it unless you have 120dB sensitive 15" woofers with low frequency horn and horn tweeters...or a really small room with old thin windows- It truly is about realistic expectations... and often times, you will be surprised at how much bass you do get, and how little bass truly is required to be immersed in music.
I am going to be experimenting with split core multiple primary and secondaries. My guess is wiring at least one sec. in between 2 primaries should reduce capacitance.
Toroidal power transformers cannot be used SE as they are very efficient at saturating. Exquisite high frequency response and absolutely no bass.
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