xQuebecx514x
Active Member
What is the difference between a Single Ended Output Transformer and a Push and Pull Output Transformer?
So much to learn!
So much to learn!
What is the difference between???
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trainbuftony
Electron Herder
differences
Push pull describes an amplifier with at least two output tubes one pushing one pulling. One does the top of the wave form the other does the bottom. In a single ended amp the output tube does both halves of the waveform. Look up schematic examples of both to see how the different types are wired. The pp unit will have equal resistance on both primary windings with a tap in the center. Single ended transformers have unequal resistances in the primary, and only connect to one tube (not exactly true) that does the entire waveform.
Push pull describes an amplifier with at least two output tubes one pushing one pulling. One does the top of the wave form the other does the bottom. In a single ended amp the output tube does both halves of the waveform. Look up schematic examples of both to see how the different types are wired. The pp unit will have equal resistance on both primary windings with a tap in the center. Single ended transformers have unequal resistances in the primary, and only connect to one tube (not exactly true) that does the entire waveform.
A push-pull transformer has a center-tap where the B+ is connected - single-ended has only two primary terminals. Also, the single-ended one has the steel laminations stacked with a gap, which prevents it from saturating from the magnetic flux due to the DC idle current. In a push-pull transformer, the idle currents from the two tubes flow in opposite directions, canceling out. A push-pull transformer will outperform a single-ended one of the same size by a large margin - handles more power, has better low frequency response.
xQuebecx514x
Active Member
Ok, so overall PP Output trans is better?
If my specs suggest a 250-0-250V @ 75mA / 5V @ 2A / 6.3V CT @ 2.5A ; is this equal to these specs:
VA : 65
117 Volt
50/60 Hz
500V CT @ 81mA / 5V @ 2A / 6.3V @ 2.5A
Im wondering if the 250-0-250v is equal to 500v CT?
If my specs suggest a 250-0-250V @ 75mA / 5V @ 2A / 6.3V CT @ 2.5A ; is this equal to these specs:
VA : 65
117 Volt
50/60 Hz
500V CT @ 81mA / 5V @ 2A / 6.3V @ 2.5A
Im wondering if the 250-0-250v is equal to 500v CT?
trainbuftony
Electron Herder
Same specs but those are power transformer specs. No offense but you probably need to invest some time reading forums and learning. Watch youtube videos and study hard. I have been reading for a few years and am just starting to figure it out. Let me know if I can help. The interwebz=your best friend. Best of luck.
xQuebecx514x
Active Member
One isn't inherently better than the other, they are for different purposes. A single-ended transformer is unusable in a push-pull amp. Push-pull transformers are pretty near useless in an SE amp. Snow shoes aren't better than parachutes, but you wouldn't jump out of a plane with snow shoes or try and cross the arctic with a 'chute.
250-0-250 is another way of saying 500 volts center tapped.
250-0-250 is another way of saying 500 volts center tapped.
kyle
Super Member
xQuebecx514x, I've been reading all of your threads and posts and the thing that keeps coming to mind is that you may hurt yourself. I'm all for jumping in with both feet but you don't seem to have enough knowledge of the basics to avoid injury.
It may be a good idea to do some reading and get enough knowledge so that every step isn't a question.
On the other hand, I could just mind my own business but us Canadians have to watch out for each other.
It may be a good idea to do some reading and get enough knowledge so that every step isn't a question.
On the other hand, I could just mind my own business but us Canadians have to watch out for each other.
xQuebecx514x
Active Member
Well, is there any advice? I feel pretty comfortable building this system, Im just trying to properly understand the function of each component.
Rule #1 Make sure its not plugged before touching anything!
Ok, I do have one question, Can those little 47 uF capacitors hold any electrical charge? Or those any component in a Vacuum tube power amplifier hold any electrical charge?
bobrown14
Super Member
Yes 500V worth and the cap WILL hold the charge for a while. 500v is enough to kill given the right circumstance...
rule 2) one hand in your pocket after first power on (caps can bite REAL hard) so can voltage from the secondary of the power transformer.
false sense of security + HV can be a deadly combination. Assume there's enough voltage to kill you.
To the OP - do you have a schematic you want to use to build something?
You should have one or at least a good idea of one you want to work with.
Dont be afraid to ask for help in that regard, there's lots of experts here to help you get started.
Cheers,
Bob
xQuebecx514x
Active Member
Yes, one hand in the pocket is a must. I have been electrified a couple of times. The last time it had a nice ark of at least 6 inches in radius..lol! I do have a schematic. Really simple! Cant wait to listen to them
I will probably have a couple of questions on the screen tap of the PS! I don't understand what implications the screen tap is used for?
pdm4606
Super Member
PP vs SE
I see a problem in that they charge as much for a SE as a PP. Nice deal.....
Give the customer half of what he expects for the same. I have only read about SE in mags. and usually low powered.
There are some higher power SE amps but not much said. They are supposed to be Type A configuration and that makes them sound better.
Most of the stuff we deal with is A/B type output where the amp makes a transition after the first few Type A watts to type B output.
There is always the argument for the so called transition distortion when an amp goes from type A into type B. Hidden someplace in amp specs.
Reviewers are sometimes creating weird specs. when they run an amp at low levels when an A/B design is at it's optimum A type (low) output.
Paul
I see a problem in that they charge as much for a SE as a PP. Nice deal.....
Give the customer half of what he expects for the same. I have only read about SE in mags. and usually low powered.
There are some higher power SE amps but not much said. They are supposed to be Type A configuration and that makes them sound better.
Most of the stuff we deal with is A/B type output where the amp makes a transition after the first few Type A watts to type B output.
There is always the argument for the so called transition distortion when an amp goes from type A into type B. Hidden someplace in amp specs.
Reviewers are sometimes creating weird specs. when they run an amp at low levels when an A/B design is at it's optimum A type (low) output.
Paul
