Tube output impedance calculator. However, a quite accurate estimation can be obtained as .

Tube output impedance calculator. The nominal impedance is in electrical engineering and electro-acoustic (audio), the frequency-dependent impedance at the input and / or at the output of an electrical device, which is specified in the middle frequency range at 1 kHz of a technical data sheet. New! Step-by-step procedures for designing vacuum-tube guitar amplifier circuits. It is affected by the non-linearity of the vacuum tubes and the impedance variation of the output transformer in class AB operation. 5 to 8. Observe the updated green AC load line, which shows the extent of guitar signal swing relative to the DC operating point. 5k primary impedance depending on Optional Rload in Ohms (typically the output transformer primary impedance) Only considered when PP (Push-Pull is selected) Number of tubes Power Tubes Pre Amp Tubes: Use formula for: Enter its plate current and grid voltage from the graph. Click the recalculate button. To calculate the impedance and winding ratios, simply enter the known primary impedance and the speaker impedance of the secondary tap. com Nov 18, 2007 · I would use 100K, 22K and 5k1 as loads and calculate the output impedance (from the measured output voltage) for each of these loads. The calculator outputs three different bias points for a given load impedance. Output impedance: to calculate the output impedance, imagine that we apply a load "Rload" from output to ground that has a value that equals the output impedance of the circuit above. Jan 15, 2008 · I am hoping to start a thread where we share various online calculators relating to tube amp work, with a full appreciation that a calculator is only a tool and understanding is the key. Still taking two measurements though. However, a quite accurate estimation can be obtained as . Apr 23, 2024 · Hi everyone, recently I've been updating a little spreadsheet for designing power and output transformers and filter chokes for tube amplifiers. the speaker). To perform this calculation, you must apply voltage to the taps of the output transformer and take measurements of what the voltages are on the primary and secondary taps. So start with impedance ratio, select tubes in which topology, select suitable PT, fabricate a chassis, then build the amp if you get my drift Just a way of Apr 21, 2023 · Given the two voltage measurements, and knowing the impedance (resistance) of the external load, you can calculate the 'internal' impedance of the amp, which becomes the output impedance of the amplifier you are measuring. See full list on robrobinette. When looking at plate resistance for output tubes, I look at the voltage on the plate and the current running through the tube for a target power. What do I use to get an apparent impedance at this operating point? For instance if an impedance is placed at the output of a transformer (Z L Z L), the impedance looking into the transformer (Z i n Z in) will depend on both Z L Z L and the turns ratio (n n). You can: choose among most common power vacuum tubes (I am slowly adding more), set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode, set Single-Ended or Push-Pull configuration set the Power Supply V+ voltage, the screen voltage, the Mar 28, 2020 · I like to experiment with unique designs and its sometimes fun to just hook up stuff and see what happens. OR, you can load the amp with two different "known" load impedances. Enter the input impedance (AC load) of the next stage. This calculator allows you to compute and tune loadline and operating point of tube amplifiers’ power stages, for most common power vacuum tubes. This calculator allows you to compute and tune loadline and operating point of tube amplifiers’ power stages. Happened to come across this on an amp manufacturer’s YouTube channel and thought I’d get some opinions. Read the cathode resistor value from the top of the calculator. What's the formula? Jan 16, 2013 · Tubes generally have higher output impedance than solid state products. Input Impedance Grounded Cathode Amplifier 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. 1 Maximum output power estimation and voltage gain of the power stage A precise estimation of the maximum output power of the power stage is difficult. There are plenty more tube arrangements that would involve their own equations, but screw that noise because this shit is already way too technical for WTF-level tube hooliganry. The characteristic impedance used in the S-parameter measurements. As an example on the 6v6 the rca manual gives you a range of 5. The first is where you get to pick the steady state bias power for each tube. Aug 14, 2025 · Tube output impedance chart?Yeah, not quite what I'm looking for, calculations are always done once a build is commenced, it's more of a quick reference pre build chart I'm wanting. One piece of evidence you see in most tube power amplifiers is the output transformer of the tube amp. g. Originally posted in Dumble Files but thought this might be more of a general/technical question. The frequency at which you will use the amplifier, the source's and load's impedance, and whether you want high pass or low pas networks on the L-Matching networks. Here are theoretical maths to calculate the input and output impedance of grounded cathode amplifiers and cathode followers. This is necessary to get an efficient transfer of the audio signal to the speaker. The third is at 100% of rated plate voltage for the tube. Step 1 - Use this calculator to convert THD or THD+N from percent to dB (if necessary) THD % to dB Converter Results update on input change. 6. Mar 11, 2024 · The Push Pull Tube Calculator is an essential tool for audiophiles, engineers, and technicians working with tube amplifiers. However, let me take a little look at the calculations and the transformer, before we 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. The early version of this was designed by myself around 2015 and it was mostly based on Patrick Turner design method, but it was far too complicated What does this calculator do? The calculator calculates a cathode follower's unloaded voltage gain (the gain without being connected to the next stage) and output impedance based on the triode's characteristics and the cathode resistor value. It simplifies the complex calculations needed to design or troubleshoot push-pull tube amplifiers, which are renowned for their efficiency and sound quality. From system design concepts to individual stage operation, an all-new examination of Bassman electronics. Choose your listening configuration. From "woody" to narrow panel to brownface to blackface Reverb, an in-depth exploration of Fender Deluxe circuitry. the output power transformer or OPT, which matches the output power of a tube to its load (e. This is there to more closely match the high output impedance of the amplifier with the low input impedance of a loudspeaker. The second is with all tubes running at 100% of rated power which can cause the Eb1 bias voltage to exceed the rating for tube. These calculators help in determining the optimal settings for the output transformer, load impedance, and Sep 16, 2019 · How do you calculate the output impedance of a simple, single triode section, cap output, preamp? I know the plate resistance of the tube affects this. Apr 17, 2022 · Question about determining output transformer primary impedance. I label all my S/H OT's with their impedance ratios. To use the calculator, enter in the amp's S-parameters. Nov 23, 2022 · Enter the rated output power of your amplifier. 1. Is this formula legit? (B+ voltage squared)/ (Plate dissipation x number of power tubes) Example: a 50w (6L6GC x 2) build Jan 23, 2020 · The principles and calculations are basically the same for a push pull stage as it is for an SE stage, so everything described in the Impedance matching of loudspeakers to output valves article are valid for any transformer, but there are other concerns to be taken when calculating a push-pull transformer. My question is when i want to figure out what the primary impedance of an output transformer should be close to for a power tube that load resistance is not given on the datasheet. This topic is covered in PART 1. The output impedance will vary slightly between each load value. Any mismatch, either high or low, will cause the power to be less than the maximum. Dec 13, 2023 · For the tubes to produce their maximum power the transformer must match the tube impedance to the speaker impedance. What does this calculator do? The calculator calculates a triode amplifier's unloaded voltage gain (the gain without being connected to the next stage) and output impedance based on the triode's characteristics, resistor values, and whether or not the cathode resistor is fully bypassed by a capacitor CK. View the result! If the result is less than 0 dB SPL, the THD +N produced by your electronics will be absolutely inaudible. Sep 24, 2020 · For example, only in a push-pull class-A amplifier, which is astoundingly rare in spite of what glossy ads proclaim, do its output tubes see a constant load impedance; otherwise, the load impedance varies depending on whether both tubes are turned on or one is cutoff. The -3dB low frequency cutoff point can be determined by the following formula: f = Z/ (2*Pi*L) where Z is the primary source impedance (generally speaking, this is the reflected impedance in parallel with the source impedance presented by the tube's plate) and L is the primary inductance. vtpr a0tzt r9xasaz dqop uq 4xv 5mzx yvx4 mbxjd hun8