The Matamps are known for running hot and power tube breakup is a huge part of their sound, but I wouldn't want to have to buy a new set of tubes more often than I . Continue targeting switch is equivalent to breakDid you mean to use continue 2. #3. I am using it to calculate the dissipation watts and get results far from what I measure. Just be careful. I also have a 68uF-100v bypass capacitor with it. Measure voltage drop across them and calculate with Ohm's Law. Total Cathode Current =. Please check the fields highlighted in red. This is the maximum most folks would suggest. You must log in or register to reply here. Calculate Plate Dissipation Based On Plate Voltage And Cathode Current Readings. Mine is a 45 watt silverface amp. TUBES SHOWN/TESTED AT THE SAME TIME: 1. In these calculations, 5% of the cathode current is assumed to be screen current. The VI switch allows one to switch the digital meter between reading plate voltage and cathode current. Total Plate Current. Even the Weber Bias calculator shows 45-50 ma recommended for running 6L6s at that plate voltage. Tell us the amp you have and the plate voltage and the tubes you are biasing and we will help you through it. Weber Bias Calculator. Tube Stereo Guitar Power Amp project. So. The way I measured it was the red probe on B+ and the black probe on pin #3. So I bought worlds ugliest PRS for $500. The Bias Rite is supplied with an integral digital readout which measures the cathode current to the tenth of a milliamp over a range of 1 to 199 milliamps. Some of the add-ons on this site are powered by. Lets say we have a Deluxe. Use this as a guide for setting your bias. Yeah, i saw that alert too. Write it down. JavaScript is disabled. May 28, 2011 #19 I have had a bias rite go south. You need to know the plate voltage in order to properly bias your amp. Before forecasting sales, revenue or any growth of a business, it's helpful to create an objective. (Effective May 24, 2021) Service/mod/repair work is $40 per half hour. The cheapest solution. This calculator uses the power equation. Based on your location, we've changed your settings: This is a great tool so that you can bias your own amp quickly and easily! For a better experience, please enable JavaScript in your browser before proceeding. Bias Probes Or Weber Bias Rite For Biasing Tube Amps Music Electronics Forum. This item is hand-built to order, to ensure the best attention to detail is paid to its construction. The VI switch allows one to switch the digital meter between reading plate voltage and cathode current. Direct. Mint items are in essentially new original condition but have been opened or played. I usually shoot for around 60-65%. TUBE DISSIPATION READING: no. 160 - 180C. The calculator computes the -3dB bass cutoff frequency the bias excursion ratio the bias excursion time in milliseconds and the bias recovery time in milliseconds. It may not display this or other websites correctly. Here's the rundown from Weber: By clicking Subscribe, I agree to receive exclusive offers & promotions, news & reviews, and personalized tips for buying and selling on Reverb. According. mA ( Cathode Current minus approximate Screen Current of 5.5% ) Plate Current per Tube =. This calculator uses the power equation. The Bias Easy 800 measures the current in the power tubes of your amp. DC voltage measured between plate and cathode. Simpsons rule calculator. 160 - 180C. 5E3 bias. Let's say your amp has a plate voltage of 500 volts. It seems that your original tubes bias within 1 MA which is great. So in neutral it does nothing. The Weber bias calculator sets this at hot with the plate voltage at 500VDC, of which I'm reading 510. The other uses the cathode resistance, cathode voltage, and plate voltage. P is the power rating of the power tube I is the bias current and V is the plate voltage of the power tube. 140ma or 0.14 amps. Weber Bias Calculator. The Weber Bias Calculator and Tube Amp Bias Calculator did suggest 50mA, so we are barely at 58% of rated maximum plate dissipation. Also Super Reverb is 40W not 45W. Expedited/rush service is available at a rate of $100 per hour. Damn, now i put the original Tungsols back in turned the amp on to take a reading and the standard hum from the amp started diminishing and the Rectifier tube flashed and everything went out. Tube type: ----Choose---- 6V6 EL84/6BQ5 5881 EL34 KT66 6L6GC KT88/6550 Mods and Projects 3. Enter the plate voltage and type of power tubes to get the bias current at various levels of plate dissipation. which is 48mA/tube. Sodo we know who were the ones that Dumble refused to build amp for ? How to Measure Bias. My bias was set to full counterclockwise when i put the tungsols in. I would do 12/360=.033 *.7= .023 milliamps. (Actual Plate Voltage) There have been reports of those damaging amps, I'm not sure how much of that was caused by operator error. The screen voltage is only 1v less than the plate. Your EL34's are a 25 watt tube. The story of Sister Percy Jackson the Olympians. Take the bias thingy out of the loop, and power up in a dark place, carefully watching (and ready to shut it off) the tube. You can also put your own letters through this online gender bias calculator. Facebook LinkedIn Assistance. For calculating plate dissipation in cathode biased circuits subtract the. I measured the current from B+ to pin 3 and get about 30mA. The VI switch is standard on all complete models. The VI switch allows one to switch the digital meter between reading plate voltage and cathode current. You must log in or register to reply here. Used Plate to Cathode Voltage = volts Change Plate to Cathode Voltage. It may not display this or other websites correctly. Determine the objective of the forecast. Right now there are 2 NOS GE 6550 tubes in there, and 3 new JJ ecc83 preamp tubes inside. Based on the weber bias calculator, I should be biasing at 32Ma. in r quora, mape and bias introduction demand planning, bias calculator tutorial with continuous bias formula and, steps to calculate relative percent difference precision, detection sensitivity and response bias, the concepts of bias pr ecisi on and accur acy and, gage r amp r bias and linearity excel template qi macros, examples of . Turkey: Whole (10-12 lb) 2.5-3 hrs. Every time I bias my amp, I have to relearn everything. The weber calculator told me that a hot tube would be in the 35mA range. halved, stone removed, on skewers, sliced side facing down. The first dings in a new nitro guitar are painful, Tinnitus is ruining my life. Not for 7591 tubes. Use the GPA Calculator to help you gauge your status. My recommended bias measurement method is the "Output Transformer Resistance Method."You measure the output transformer's voltage drop and . I P V. A deep dive into the electronic design of the ultimate high-gain rig-of-death. https://taweber.powweb.com/biasrite/br_page.htm, http://www.ax84.com/contrib/biascalc.php?Bvolts=440&maxW=19&Action=calc. to Weber bias calculator the tubes are running hot. PLATE VOLTAGE READING: no. With multiple tubes sharing the same cathode resistor, this calculator assumes the tubes are fairly well matched. You have 820 ohm screen resistors. Plate Voltage: Hot (70%) Avg (60%) Cool (50%) 200V: 46mA: 39mA: 33mA: 225V: 41mA: 35mA: 29mA: 250V: 37mA: 32mA: 26mA: 275V: 34mA: 29mA: 24mA: 300V: 31mA: 26mA: 22mA . on: April 01, 2011, 04:15:34 pm . I chose to play the amplifier 'as is' (41.4mA), and it sounded just fine. I developed this calculator to give you the minimal internal temperature you must cook meat for doneness so you never over or under cook it again! about the fact that each bias probe socket includes a 1 ohm resistor in each cathode circuit and that the BDRI also includes a 1 ohm, 5% tolerance resistor that is set up to measure the cathode current of both tubes combined. Enter the values for your amplifier below. miketn . You are using an out of date browser. Sodo we know who were the ones that Dumble refused to build amp for ? Hey! P = I V. P is the power rating of the power tube, I is the bias current, and V is the plate voltage of the power tube. And sanded it down and refinished it! Calculate GPA for one semester . P is the power rating of the power tube I is the bias current and V is the plate voltage of the power tube. Grout Calculator Adhesive Calculator Pool Paint Calculator Marbelite Calculator. So far, never hurt anything biasing, even with the two failures. DC voltage measured between plate and cathode. 160F in thickest part of breast. mA. This bias calculator comes with the actual formula and a very easy to use and helpful continuous bias binding chart to figure out your bias needs in a blink of an eye! This is your plate or "B+" voltage. Add Reverb to the Western Electric Circuit. Weber has two calculators one using plate voltage minus cathode voltage and cathode. Thanks, but the plates are not red in cathode bias mode. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. Includes two 8-pin probes with gold plated pins and socket, power adapter and operating instructions. Solving for I we get. The tubes were in when I measured. So I bought worlds ugliest PRS for $500. . And sanded it down and refinished it! The formula for the Weber Fraction is: k = I / I. where: k = Weber Fraction. One probe crapped out, twice on the same unit. The way you figured out the bias, and the way I did are a little different. Weber Bias Calculator it has a calculator for 6550s.. 50% is cool, 50% is avg, and 70% is hot. The link for the weber bias . Triple beam balance calculator. We charge a minimum 40 bench fee 5 hour that is applied towards your invoice. This is the maximum most folks would suggest. New! Our Books; Amplifier Calculators; Tube Calculators; Tutorials; back Your purchases also help protect forests, including trees traditionally used to make instruments. The JND for the weight is 5 kg, meaning that someone lifting the weight can tell that 105 kg is slightly heavier than 100 kg. I'm using a Weber Bias Rite, replacing Ruby 6L6STRs with SED 6L6GCs. Some of the add-ons on this site are powered by. Weber tylon calculators and estimates. Use this calculator to determine the bias current for an amplifier's power tubes. I use 12 watts dissipation, instead of 11.5. This allows one to quickly calculate . Is anyone familiar with the Weber bias calculator? 160-165F in thickest part of breast. I am using it to calculate the dissipation watts and get results far from what I measure. Hot 70 Avg 60 Cool 50 200V. Since 2006 we have offered a single octal bias probe for use with a Multimeter. halved in skin, sliced side facing down, turn after 1 min. P I V. MA Cathode Current minus approximate. I bias my Fender BDRI (with JJ tubes) using the Weber bias tables, a bias probe that measure each 6L6GC's cathode current and plate voltage, and a. please help me. This is a business goal that helps determine the path or direction of the company's operations.