An online three phase transformer calculator to find the current in different power units. You measure the output transformer s voltage drop and resistance to calculate the bias current. The wattage output in an amplifier may vary from application to application due to many variables such as tube types, solid state vs. From the tube data books, you determine that a pair of 6l6s. Next, measure the voltage across the speaker taps with a. Transformer capacity calculator three phase transformer.
Then i cover the different speaker combinations and. Tube bias calculator for android free download and. E design opt for 1 x el34 pentode with or without cfb. Amps that use this smaller 28watt transformer are always going to have that certain compression and dynamic that defines an output transformer going into saturation. I just got this response when i asked someone about swapping 6v6 and 6l6 power tubes. There are more output transformers for tube amplifier, you can get your wanted from them. This transformer calculator helps you to quickly and easily calculate the primary and secondary fullload currents of the transformer. Tube bias calculator rob robinettes car and tube amp. There are several things that are important in getting an output transformer made. The halfprimaries of the output transformer should have identical voltages on them. How to calculate audio output transformer load resistance. Langfordsmith, editor, radiotron designers handbook, 4th edition, harrison.
Calculation of output transformers the output transformer is probably the most expensive part in the amplifier and something you have to live with if you like classic tube amplification. Audio output transformers are heavily used in a vacuum tube and some. Donwload transformer calculator program for calculating number of coils and wire. The pat4006cfb is a semicustom version of the 100w pat4006, available on special order, designed for four 6550 or similar tubes in pushpullparallel. We have been producing tube output transformers continuously for over 75 years, constantly improving and tweaking their performance. Apr 30, 2010 the output transformer is the heart of a valve amplifier.
Tube amp transformers tube amp parts, guitar amp parts. Minimum inductance of the primary winding of output transformer. Download transformer calculator coils and wire thickness at. To calculate bias when you measure the plate current, such as when using the output transformer shunt current measurement, enter your tube type and platetocathode voltage at the top of the page. We have been producing tube output transformers continuously for over 75 years. Single ended output transformer calculating spreadsheet with.
To separate the high voltage and match the speaker impendance with the tube impendance we need audio grade output transformer. 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. Transformer calculator kva calculator full load amps calculator. Tube bias calculator rob robinettes car and tube amp website. Secondaries should have multiples of the voltage youre putting on the tap you chose. From the tube data books, you determine that a pair of 6l6s will put 4050w in class ab push pull into a 4400 ohm plate to plate impedance. Transformer calculator kva calculator full load amps. Tcj pushpull calculator helps tube audio amplifier designers develop pushpull output stages that yield low distortion and long tube life. Whether you are into the clean, free spirited single ended tube output or high efficiency, high power, pushpull audio, we have the output transformer for you. If you need assistance with circuit protection devices such as fuses or breakers, or wire sizing, please consult a licensed electrical contractor or electrician in your area who will be familiar with state and local codes. Optional rload in ohms typically the output transformer primary impedance only considered when pp pushpull is selected number of tubes power tubes pre amp tubes.
If you have an 8 ohm output transformer hooked up to an 8 ohm speaker, the transformer is seeing what it is looking for, if you hook the same transformer to a 16 ohm speaker it will have a 16 ohms load, the transformer is. It has two types, single phase and three phase transformer. This tranny has pc style mounting pins but you can also solder wires to the pins for non pc hookups. To design an output transformer, it is necessary to determine the output power according to the tubess characteristics. Delatschtransformercalculator for ios free download and. If you dont known anything about assembling transformers, please dont use calculations from this program for building your own transformer. Iif you would like to calculate and wind your own single ended and push pull output transformers for guitar amps and home hifi amplifiers, ive. When you begin the calculation you have to select the respective. Classic tube output audio transformer overview hammond mfg. Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth.
Understanding your output transformer part one by mark. All are of different design and concept and quality. Ttgcfb5000pp tube output cfb transformer 5kohm cathode feedback pushpull 474,00 zl threephase transformer t3s 2500va 3x400v 3x230v 1 890,00 zl shop is in view mode. If you need a really simple way to calculate both power mains transformers and audio transformers be it a pushpull or single ended ones mainly for tube. The lowly ab763 blackface deluxe has anemic power and output transformers, two preamp stages, two small power tubes and a single 12 inch speaker driven by 22 watts.
The objective of this project is to develop an output transformer for singleended tube amplifiers with. If you used an 8 ohm tap, a 4 ohm tap will have about 2. If you download tube data sheets for 6l6gc and 6v6gt tubes ge, sylvania, or rca data sheets are my favorites and look at the recommended operation conditions supplied by the orig tube engineersyoull find that there is a range of platetoplate loads aka ot primary impedance into which these tubes will safely operate. Use the ac wall wart below to power this transformer. Use the following instructions to determine the load resistance of an unknown audio output transformer. This method is more dangerous because when your meter probe. Get a low voltage ac transformer about 10v or less and place it across the speaker taps of the output transformer ot. Aug 25, 2015 audio output transformers are heavily used in a vacuum tube and some older transistor base audio power amplifiers, but these days output transformer are quite hard to find and expensive item. It is important to note, however, that these solutions are best only for those experts who have knowledge and experience with assembly transformers. This is shown in the example with 3 different circuits. Ab763 blackface amp model differences rob robinette. Dec 02, 2015 designed specially for mot microwave oven transformers but this calculator will work for any transformer.
Professionals with experience in transformer assemblies use the computer program to calculate the number of coils and wire thickness. Enter the transformer rating and select the appropriate unit. Results of his output transformer research were published at aes conventions in 1994 and 1998. Sep 27, 2014 tcj pushpull calculator has but a single purpose. The cost of a tube amplifier mostly consists of the cost of an output transformer and tubes that is usually a factor limiting the sound quality. This program can calculate values only for standart transformer core, thats w and u profile of core. Building a tube amp, how to calculate output transformer.
The free shipping option allows tubedepot to choose the most appropriate carrier and service. I volunteered to put a 4 ohm load on my amplifier and re run the tests. Looking through all of my scavenged transformers i cant find a single one in the thousands of ohms, most are a few hundred and lower. Select the number of phases from the dropdown menu. Voltage design is made for wide applications for use in combination with various kinds of vacuum tubes. The pentode equation differs from the triode equation in that the screen grid replaces the plate as a controlling element, and an arctangent term from scott. To increasedecrease the alternating volts in electric power, transformers are used. Hybrid transformer are ordinarily small and under high load it can overheat. The one thing im stuck on is the output transformer, according to the datasheet i need to get a 35004000 ohm transformer with a 4 ohm output to power a car speaker i have. Transformer calculation software electronic circuits. Audio transformer is the primary part of a tube amplifier which generates an electromagnetic field. The tube bias calculator will calculate power tube bias values of plate current, dissipation and % of max dissipation using either measured voltage drop.
The two output trannys are rotated 90deg to the power mains tranny to avoid picking up induced hum from the mains tranny external magnetic field. I cover how to calculate the reflected impedance of the output transformer secondary onto the primary. Tubes do not affect impenitence, speaker load does. Calculating output transformer impedance sarris custom. There are more tube amplifiers such as singleended, pullpush, high power, and wireless bluetooth tube amplifier.
Tamura corporation audio transformers for tube amp. Turns ratio v in to the primary v out measured in the secondary e. Transformer winding turns and voltage ratio calculatorv1, n1, v2, n2. Table 2 gives parameters for the pat4006cfb output transformer relevant to spice simulation. The disadvantage is that the a2 triode requires the cost of an extra tube, and the output tube grid can overheat, so a2 is in. If you would like to simply calculate number of turns and other aspects of your output transformer for a single ended tube guitar amp or a hifi home tube amp, dont miss out on this tried and tested method which is an easy to use excel spreadsheet which automatically calculates a transformer according to your needs. In contrast, the larger bassmansuper reverb trannies will relate the vacuum tube and circuits clipping before the tranny hits the ceiling, which accounts for the fast, grainy. The formula calculates the frequency response based on the triodes amplification factor and plate resistance. For homebrew projects, the best option is to construct those transformers by ourselves and this script helps to calculate winding parameters for those. The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker. Tube bias calculator for android free download and software. You measure the output transformers voltage drop and resistance to calculate the bias current. Electronics projects, electrical engineering, vacuum tube, ham radio.
For single ended amplifiers with opt idc flow in one direction only. Most of the model differentiation comes from the power supply, the number of preamp stages, fx, power tube type and number, output transformer and speaker configuration. Single ended output transformer calculating spreadsheet. Audio transformer and impedance matching transformer. Calculating output transformer impedance sarris custom tube. The output transformer is the heart of a valve amplifier. If this is true, what is the nature of this concept. Determination of power and energy losses in power transformers. Toroid transformers ring profile of core and others arent supported. Pushpull output transformer spreadsheet calculator with. So we apply an ac voltage to the primary of the transformer and we measure the output voltage to the secondary. This is necessary to get an efficient transfer of the audio signal to the speaker. If the output impedance of the amplifier is 120 calculate the nominal impedance of the loudspeaker required for maximum power transfer. Optional rload in ohms typically the output transformer primary impedance only considered when pp pushpull is selected number.
Youre right, the 5f1 output transformer is under rated mostly for cost saving. Output transformers made in usa triode usa tube amp. If you would like to simply calculate number of turns and other aspects of your output transformer for a pushpull tube guitar amp or a home hifi tube amp, dont miss out on this tried and tested method which is an easy to use excel spreadsheet that automatically calculates the transformer windings according to your needs. Designed specially for mot microwave oven transformers but this calculator will work for any transformer. Are you looking for the best transformer calculator software for your next project. The output transformer as an impedance matching device, works on the principal of reflected load.
Output audio transformer design the output transformer in a singleended tube amplifier is the device which matches the high output impedance of the tube to the low input impedance of the speaker load 4, 8 or 16 ohm. Output transformer efficiency usually in the range from 0. He wrote over 360 articles for various dutch high end audio magazines and is the author of the book transformers and tubes. You can also measure the actual plate current by shunting the output transformer with a multimeter in the dc milliamps mode and use the tube dissipation using plate current calculator. Tcj pushpull calculator is a 32bit program that runs under windows 9xntme2000xp. Pushpull output transformer spreadsheet calculator with pdf. A 3 phase transformer has three magnetic circuits that are interlaced to give a uniform distribution of the. Maximum leakage inductance of the primary winding of output transformer. Artists later took advantage of this saturation for that tube sound along with higher than normal plate voltages pushing the maximums for more power from a small container.
It was suggested that you could put an 8 ohm load on a 16 ohm 5k primary transformer to get a 2. Nov 18, 20 amps that use this smaller 28watt transformer are always going to have that certain compression and dynamic that defines an output transformer going into saturation. To calculate bias when you measure the plate current, such as when using the output transformer shunt current measurement, enter your tube type and. It also determines the turns ratio and type of transformer. The following guidelines should be taken into account. As an example, you might want to design an output transformer for a single pair of 6l6 output tubes. Feb 02, 2017 the peavey butcher has 4 speaker jacks. Understanding your output transformer part one by mark baier.
224 857 222 218 815 1259 910 963 1339 1412 568 704 1259 63 1211 910 1335 54 280 1010 220 969 454 1065 192 43 1287 972 1013 123 1236 515 284 1019 434 523 690 1341 149 657 589 125 843 1032 527 1229 1424 734