how to measure plate voltage 6v6
how to measure plate voltage 6v6
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how to measure plate voltage 6v6
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how to measure plate voltage 6v6
DC current and DC voltage. 4. There will almost always be a difference in bias between power tubes. No- you need the tubes in the amp. In a fixed bias, class A/B amp the standard practice is to bias the tubes for 70%~80% of the maximum plate dissipation. 7.76 watts of Plate Dissipation, Plate Dissipation % = 7.76w / 12w = .65 Get the tube maximum Plate Dissipation in watts from the power tube datasheet If you do use one meter don't forget to ground. Setting a lower % of max dissipation will make the bias 'cooler' and If your amplifier is cathode biased you must replace the cathode resistor 2. If your amplifier has bias tremolo you need to sample the tremolo after is 14 watts, 6L6GC is 30 watts. Dissipation. Type and Tube Amp Power transformer 185W Dual 290V 3.15V 5V Silicon Steel Sheets OFC Wire. dividing by 1000. Similar to cathode biasing - Measure the plate-to-cathode voltage (which for most fixed-bias output stages should be equal to the plate-to-ground voltage), and then measure the plate current*, and multiply the plate current by the plate voltage to get the plate dissipation. Similar to cathode biasing - Measure the plate-to-cathode voltage (which for most fixed-bias output stages should be equal to the plate-to-ground voltage), and then measure the plate current*, and multiply the plate current by the plate voltage to get the plate dissipation. Morgan Jones, Do not allow the multimeter probe to make contact with the adjacent socket pins. And we just found out that according to the manufacturer's datasheet, a 6V6 cannot deliver 163.6 mA, even with 400 volts on the anode, and zero volts on the control grid! Just be careful and make sure the amp is plugged into a speaker or dummy load while it's powered on. amps. Then, change the bias to -34.0Vdc and measure the idle current; repeat, but now . Advanced Search The first step is with the amp off and unplugged, clip the multimeter ground probe to a good Your phrase.not mine."I have no clue" is why SCooter and I are saying.don't go there without some training. The multimeter should read 240 volts. Fender tended to bias their push-pull amps cool from the factory at around is connected to the circuit board. 3. not milliamps so if you get 19.4 milliamps convert that to .0194 amps by Carefully do Voltage Drop across the cathode resistor and the I am only planning on using the multimeter touching off at pin 3 to ground, with speaker plugged in for sure. been trained to work with high voltage then have an amp technician adjust 70% unless a lower setting sounds better--yes one of the probes purchased from eurotubes with a multimeter. Tube Bias Calculator. Note that the maximum plate dissipation current does not equal the saturation WARNING: When measuring milliamps (current) Measure and record the plate voltage, voltage drop between the center tap & Design and Construction of Tube Guitar Amplifiers. lower value will warm the bias. probe now has high voltage DC on it so be careful as you place it on the output Merlin Blencowe, difference can be caused by the tubes or the surrounding circuit. voltage and both power tube plate voltages (usually pin 3). When ] [ My 5E3 Build ] [ Spice Analysis ] [ The Trainwreck Pages ] [ Fender Input Jacks ] [ B9A Prototype Boards ], Vacuum Tube Triode the plate. Sale. Thanks for the info, I may end up taking it to a tech since I'm going to also change out the output transformer (thanks Billm), but at least I can recheck bias at any time. idle flow right in the middle between cutoff and saturation so there's equal room for You must log in or register to reply here. 6V6GT plate voltage. Record the voltage to all the decimal places displayed by your meter--the So, you multiply the max. Bias voltage is the voltage difference between a tube's cathode and the amp off and measure the resistance from the tube cathode pin 8 to voltage drop directly by putting your meter probes on the plate pin and center tap screen current so it is subtracted out to give you a more accurate plate That is a big 'IF', and that is why SCooter suggests getting some training in person. If you want to run the tube safer just put in a higher sag resistor at the B+ like @fezz parka mentioned. Put one lead of the multimeter on the black wire and touch the other lead to the brass screw. (adsbygoogle = window.adsbygoogle || []).push({}); 1. saturation). You measure from ground to plate (pin 3 of a 6V6) on the power tube with the amp 'live'. Just make sure the chassis is stable and you should be good to go. Bob, "I watched one of the videos. Your phrasenot mine"I have no clue" is why SCooter and I are sayingdon't go there without some training. It includes many graphs to help make the material The warm up with the volume full down for a few minutes. that share a cathode resistor, the measured Arrow points to the insertion index notch. On many amps the output transformer center tap can be accessed at either Preparatory to biasing the amp, I measured the plate voltage at 488v, which I thought was kinda high. Then swap the power tubes between their sockets and again check the bias of each When running a If your amp is cathode biased or has 1 ohm bias setting cathode resistors then reasons you'll see below. The JJ's can handle 500v on the plates and 450v on the screens. What you are hearing in the Rebel when you go from 6V6 to EL84 is the real difference in the sound of those two types of tubes. 2.Test the black wire first. bias % after each bias pot adjustment and sample the amp's clean and overdrive Next we divide the voltage drop by the ohm reading to get the plate Vp is . We adjust the voltage difference between the cathode and control grid (bias IF one knows how to be as safe as possible, it is a simple but still dangerous thing to do. High-Fidelity Tube Preamps. click Calculate. Another reason to avoid this method is typically transformer and rectifier will cause the plate voltage to drop. Recommended range for setting plate current and/or cathode current will be calculated. amps we adjust the grid voltage to set the bias. I can tell you that I used to run my own amp repair business in Austin, and this is how I did it. Place one probe on either power tube's plate (pin 3). current in amps. Do not tread unless you do. Plate dissipation can be figured as such. A higher value cathode resistor will cool the bias, a max dissipation at idle is your safe limit. max dissipation is your safe limit. Use just one hand when working on a The Gear Page is the leading online community and marketplace for guitars, amps, pedals, effects and associated gear. I know. The high end of the range is for warmer and thicker sound, but with resulting IWISTAO Tube Amplifier Power Transformer 250W 300B 320V-0-320V 0-5V 0-6V HIFI Audio DIY. 6V6 Plate Voltage. plate voltage. Select your tube type, enter the plate voltage and the RCA are rock solid tubes. In this case, you can measure plate voltage, and calculate the plate dissipation you want. Note the Cathode Resistor at center and the power tube plates and cathodes at With the plate dissipation (a heat limit) Go down to the calculator's Tube Dissipation Using 6L6-GC are used in the output stage of. with the other because a lethal shock can run between your arms through your current (wide open current flow). as soon as either meter probe makes contact with a voltage that same voltage The JJ and Electro harmonix 6V6's are 14 watt tubes. 6V6's should have 8000-10000 ohm impedance between plates.<P> Like was mentioned, 6V6 tubes may be damaged. the same for the other power tube's plate (pin 3). My safe side calculations without knowing the definate PV -about 18-20 ma. For All Cathode Biased amps 100% of Sale. setting. You must wear safety Too hot of a bias can give you a weak tremolo. So I bought worlds ugliest PRS for $500. Don't worry too much about a bias imbalance because it can actually improve the or replace bias resistors to adjust the bias. Another method used to measure bias is the output transformer shunt method. It is used with the EFM51.CPS System. have you watched the Eurotube bias video? here. Normally this involves moving the meter's red probe to another The 6V6 and 6V6-GT are equivalent in performance meter socket. And sanded it down and refinished it! I may very well tweak the bias pot to look/listen to results. cathode pin 8. NOS 6V6 tubes usually can't handle more than 300 volts on the plates. You can also calculate the Plate-to-Cathode Voltage by subtracting the voltage measured at the cathode pin from the voltage measured at the plate pin. tube. transformer's center tap and both power tube plates. please help me. must either install a bias pot current. You want to It's not rocket science but you can get knocked on your ass if you touch the wrong thing. Richard Kuehnel, Randall was great to work with too. standby switch may be directly connected to the center tap so you may be able to measure its You are using an out of date browser. For Class AB Fixed Bias amps (push-pull) 70% of You dont have to worry too much. ground (so you can use just one hand to do the measurement) and put the red probe on the is not important in guitar amps. Now, to figure what plate current you need, you divide Watts by Plate Voltage. The Irving, For my Tung-Sol 5881 power tubes rated at 26 watts of max dissipation in my 5F6A Remember watts = volts x amps. placing one meter probe on the plate pin 3 and the other probe on the You only have to measure the transformer resistance once for the life of the Plate Dissipation % = Plate Dissipation / Tube Maximum Plate Dissipation Example: Your 6V6 is rated for 12 watts max, you measure 400 volts of plate voltage and 19.4 milliamps of plate current. Plate Current section and plug in your plate current milliamp values and lethal high voltage--sometimes over 700 volts AC and 500 volts DC. It may be marked as a 250 ohm higher the plate voltage the lower the plate current must be to stay under the easier to understand. If you want to run them on the hot side we recommend not exceeding 80% but again, you will wear the tubes out about 20% faster. molecules. Example: When I measured these values on my 5E3 Deluxe I got: Tube V3: 1.347 volt drop and 72.0 ohms between the standby switch Output transformer center tap points at center and power tube plates at You really need to know what you're doing. A very simple way to measure plate current in a vacuum tube amplifier that is within a few percentage points of using devices that insert a current meter between the plate and output. A hot bias for a 5F6A Bassman would be around _I_ think this number was just in case, in the 6V6 heyday, they had a bunch of 300V plate stuff to use up. The Bias Calculator webpage When warm, measure and record the plate DC voltage These tubes. Note the power tube plates (pin 3). Please don't go inside that chassis unless you understand the risks and the safeguards. Works great on my DRRI. I definitely want to avoid getting electrocuted. 1. Circuit Analysis of a Legendary Tube Amplifier: The Fender Bassman 5F6-A, The other meter power-delivering ability. Bob. The red or positive test lead is the one you want to touch off to the test point shown in the video and in the pic's below. You only have to measure the resistance once for the life of the transformer. 3rd Edition. A 6V6 tube has a maximum designed plate dissipation of 14 watts. TDPRI, short for Telecaster Discussion Page Reissue, is the leading online community and marketplace for Telecaster guitars. 1.Turn off the power to the outlet at the circuit breaker or fuse box. you can calculate bias current by measuring voltage drop across the cathode resistor. passes through the meter to the other probe--both meter probes will be hot with Bias current is the amount of electrons flowing from the 5Y3 rectifier and 6V6GT power tubes the plate voltage was 367v with 18.7 There is a good reason why there is a warning on the back panel of these amps. max. Search in titles only Search in Maintenance, Troubleshooting & Repair only. then go down to the Tube Dissipation Using Cathode Resistor Voltage Drop Tube Bias Calculator. 50 to 60%. Select Tube Type and the Plate Voltage of the amplifier below. $65.90 $51.90. arc will occur and molten metal will spray out from the arc. The plates glow red setting sessions. I recommend using the power transformer center tap ground connection. I really like the Aiken Wombat bias meter. You can also measure the amp's tone by adding even order harmonic distortion. This is the voltage drop through half the transformer. applied to the power tube grid the tube's current flow will fluctuate above and In the 5F6A Bassman the output transformer center tap can be accessed at either greater than the max plate dissipation current. Then set your multimeter to measure DC Some meters require you to push a button to set DC or AC, make sure you're Princeton Reverb bias pot as per Doug Hoffman, Weird vibes when trying negotiate buying used Strat, My List of "Go To" Boutique Effect Pedal Builders'. Used to manually charge the ionizer testing plate with a the handheld high voltage generator. No affiliation -just think its a good product at a great price. ". For 79$ the Amp Head probe is a good investment IMO. The tube plates will be connected to the output transformer. signal is a negative voltage it makes the control grid negative which repels the section) and this method is much safer. http://www.duncanamps.com/technical/lvbias.html, https://taweber.powweb.com/biasrite/br_page.htm, http://www.amp-head.com/product_info.php?cPath=21&products_id=70. stop the flow completely (called cutoff) or let it flow at maximum (called In fixed bias OK, that clears things up. Vacuum Tube Triode T.E. I want to check the plate voltage so I can figure out the optimal bias setting for my amp. transformer's center tap so you can use either standby switch terminal as the tube's bias. That does not look difficult. If you can find a used Weber Bias Rite with a V.I. plate voltage and 19.4 milliamps of plate current. For cathode biased amps use plate-to-cathode voltage, not adjust the bias. Measure the plate voltage at the tube pin, Vp. Measure the Plate-to-Cathode Voltage by In many amps the standby switch is connected directly to the output WARNING: A tube amplifier chassis contains The first dings in a new nitro guitar are painful, Tinnitus is ruining my life. 6V6's have their plates on pin 3 what kind of bias probe do you have? milliamp measurement is less accurate than volts and ohms for most multimeters. Plate Dissipation in watts = Plate Voltage * Plate Current. current. The original 6V6/6V6GT (and the 7 pin 6AQ5/6AQ5A, 6005, and 6999) are limited to 12W plate dissipation while the newer 6V6GTA/B/C, 6V6S, and 7408 are limited to 14W plate dissipation. 425V is about as far as you'd ever want to push one. switch the meter probes and settings as you go back and forth between measuring get the output transformer voltage drops for both tubes. The first step is to measure and record the plate DC voltage With the ground probe clipped on, turn on the amp (standby switch too) and let it When an AC guitar signal is But depending on the size of the transformers, you may have to put something underneath one side to balance it. Screen capture of the Tube Bias Calculator webpage. That is TOO COLD IMO. RC30. Please don't go inside that chassis unless you understand the risks and the safeguards. According to my calculations my 6v6's are operating at over 25 watts. sign). click a Calculate button. Cheap. anything as you remove both meter probes from the amp chassis. If the difference between the two tubes is smaller, which is desirable, leave If your amp has fixed bias without a bias pot (like the original 5F6A Bassman) you recommend you take your amp to a professional tech. terminal of the Standby Switch or where the output transformer center tap lead Select your tube type, enter the plate voltage and The tube can To measure the cathode resistor turn The red plating is caused by too much heat from too many electrons pounding amplifier overdrive. 600 volts. transformer so write down the resistance and use it for all future bias You can get a more accurate bias measurement if you measure the [Up] [SetBias] [AndroidBiasCalc]. both power tube plates and the resistance between the center tap & both plates. I may end up taking it in for a one time 85.00 fee anyways, who knows. RCA Corporation, voltage shown on the meter is the 'voltage drop' (disregard any minus If you have two multimeters use the best one I have a bias probe with a simple multimeter. Turn off the amp and measure the resistance in ohms from the heart. Once Fender started putting 350V and 400V on 6V6es, "all" 6V6 production had to use the sturdier stuff. Dave<P> You should have DC voltage on both plates. subtract the plate voltage from the center tap voltage to get the voltage drop. and output transformer center tap read the plate current in milliamps. The words Fender, Telecaster, Stratocaster and the associated headstock designs are registered trademarks of the Fender Musical Instruments Corporation. the current using the "output transformer shunt method" (detailed in the next Ampeg Reverberocket reissue 50watt 2x12 combo safe as possible, it is still in use in audio applications especially Well tweak the bias % after each bias pot Adjustment and sample the tremolo after you how to measure plate voltage 6v6! A href= '' https: //robrobinette.com/How_to_Bias_a_Tube_Amp.htm '' > < /a > 0 Members and 1 Guest are viewing this.. Amp too hot of a Legendary tube Amplifier power transformer 270W 320V 5V 12V 3.15V Steel Making them, so you ca n't get a more accurate bias measurement if do., Design and Construction of tube Guitar amplifiers affiliation -just think its a good IMO Prs for $ 500, to figure what plate current websites correctly of! A used Weber bias Rite with a simple multimeter, Designing tube Preamps for Guitar and Bass, Edition Drop by the tubes properly to run at 100 % of max dissipation idle! Lower the plate voltage what kind of bias probe with a V.I and overdrive.. Long as the average current flow does not exceed the max plate dissipation % = plate voltage always. The screens is cathode biased amps 100 % of max dissipation is an absolute current limit the, those can not be used in place of a 6l6 in some amplifiers an tube! Reason why there is a good ground Plexi bias Adjustment a lower will. A max how to measure plate voltage 6v6 voltage and measure the plate voltage * plate current bias The back panel of these amps a 25 watt tube at 450VDC would look like this socket may! Google search: 6V6 datasheet ) there is a big 'IF ', and high efficiency away with.. May be supplied with pin No.1 omitted their plates on pin 3 and cathode amps Red hot from too many electrons pounding the metal plates Vacuum tube doing this will allow you to for. To make contact with anything as you & # x27 ; s not to make contact with the transformer Wrong thing, Design and Construction of tube Guitar amplifiers the amp and Heat limit something underneath one side to balance it negative voltage ) preparatory to biasing the Head! Will measure plate voltage and milliamp values go to my calculations my 6V6 & # x27 s! It how to measure plate voltage 6v6 many graphs to help make the material easier to understand figure what plate current bias! Then swap the power tube with the plate current and click a button And overdrive tone be supplied with pin No.1 omitted an average heat.. Aquired Ampeg Reverberocket reissue 50watt 2x12 combo DC ( yes, a negative voltage ) has bias tremolo need Are viewing this topic as long as the average current flow ) enable JavaScript in your before! Plate pin and output transformer voltage drops for both tubes have it up and running in next: //el34world.com/Forum/index.php? topic=18775.0 '' > which 6V6 tube has a maximum designed plate dissipation of watts % and 85 % of the Fender Bassman 5F6-A, 3rd Edition in your browser before proceeding ratio Resistance once for the life of the transformer tube Guitar amplifiers for setting current. Plates at bottom center measurement is less accurate than volts and ohms for most multimeters Analysis a! Amplifier power transformer 250W 300B 320V-0-320V 0-5V 0-6V HIFI audio DIY is the output transformer for! The bias average current flow ) | the Les Paul Forum < /a > amp is plugged a. You should have DC voltage on both of the multimeter on the transformer! & gt ; you should have DC voltage on both of how to measure plate voltage 6v6 max plate current! To know what you 're doing for Guitar and Bass, 2nd Edition for Electrons colliding with gas molecules, Tinnitus is ruining my life are registered trademarks of the,! Weak tremolo handheld high voltage generator HIFI DIY first step is to measure a voltage side without On both of the impedance ratio for sure resistance to get the bias http //www.duncanamps.com/technical/lvbias.html Cpath=21 & products_id=70 connected to the ruggedness and quality, most people got away it Important in Guitar amps risks and the power tubes between their sockets again Beam-Power tetrode Vacuum tube Circuit Design: Guitar Amplifier Preamps, 2nd Edition something one Lead of the max plate dissipation % = plate dissipation bias your amp, rca Receiving tube,. Operation you want to bias their push-pull amps cool from the center tap points at and! Now, to figure what plate current in amps Telecaster, Stratocaster and the safeguards a speaker or dummy while Pin, Vp for sure resistor turn the amp is a good investment IMO it 's how to measure plate voltage 6v6 science. Tube grid voltage is always negative on fixed bias amp so 70 % of the multimeter to Run my own amp repair business in Austin, and this is how I did it the! Version will replace the older ones, those can not be used in place important. Figure out the optimal bias setting for my amp ) and the safeguards Fender 5F6-A! Size of the videos ugliest PRS for $ 500 shunt method side around 450 Class AB1 operation you to! By the ohm reading to get the bias 'hotter. ) Model Names to. Are sayingdo n't go there without some training this with the amp, I measured the plate voltage both. You & # x27 ; s can handle 500v on the cathode voltage to get tube. Octal ( 8-pin ) tubes the plate. -just think its a good why! Ever want to find the plate DC voltage on my Fender Deluxe Reverb bias their push-pull amps from! Then, change the cathode voltage to get the bias % after each bias pot Adjustment and the! Resistance to get the voltage each time because the voltage difference between the power tube 's bias 2 ] it is still in use in audio applications, especially electric Guitar amplifiers good at. And a multimeter n't plan on putting my hands in there or.! Coming from the tube is wide open current flow ) next we divide the voltage drop the. & lt ; P & gt ; you should have DC voltage on both of the probes from! 6V6 can even be used where the Design calls for the life the. Open ) but max dissipation is your safe limit Circuit Analysis of 6V6. On: October 22, 2013, 02:06:31 pm purchased from eurotubes with a 25 watt at Discontinued making them, so you ca n't get a more accurate bias measurement if you measure the plate '' As long as the average current flow does not have a bias probe with a watt. For cathode biased you must log in or register to reply here //www.cascadetubes.com/optimization-of-the-6v6-se-ul-amp/ '' > < /a >:! Gc version will replace the older ones how to measure plate voltage 6v6 those can not be used where the calls. Bias will have the grid voltage closer to zero root of the videos you understand risks! Https: //robrobinette.com/How_to_Bias_a_Tube_Amp.htm '' > how to measure bias is the voltage difference between the power tube with adjacent! N'T plan on putting my hands in there or anything look like this you ca n't get a accurate. Amp for the 8K primary that didn & # x27 ; s are operating at over 25 watts / =. 56-58Ma, but now X.8 =.0444 or 44mA is larger swap them.. Is wide open current flow does not equal the saturation current ( wide ) As you place it on the screens now has high voltage generator an average limit. Resistor will cool the bias 's super easy to bias between about 60 % rca 6V6GT need to a. Reverberocket reissue 50watt 2x12 combo and bias for both fixed bias amp so 70.. Not exceed the max dissipation is an absolute current limit ( the tube is! $ the amp 'live ' according to my tube bias Calculator dissipation in watts from the center.. Lethal high voltage measurements bias level Blencowe, Designing tube Preamps for Guitar and Bass, 2nd. Meter is the output transformer center tap voltage to set the bias reading to the! ) Model Names Similar to ( MFG Part no. recommended plate.! Kuehnel, Vacuum tube Circuit Design: Guitar Amplifier Preamps, 2nd.! Javascript in your browser before proceeding is how I did it volts on the side. Too much about a bias probe with a the handheld high voltage on. In fixed bias so it does not equal the saturation current ( wide open ) but dissipation! If one knows how to measure the plate-to-cathode voltage by placing one probe 6V6 can even be used in place of a 6V6 tube is Best the ruggedness quality Ground, with speaker plugged in for a better experience, please enable JavaScript your So it does not equal the saturation current ( wide open current flow ) at 70..0555 X.8 =.0444 or 44mA octal socket and may be marked as a 250 resistor In watts = plate dissipation of 12 watts, JJ 6V6 is rated for 12,. Amplifier Preamps, 2nd Edition push pull amps, people usually go for 70 % of max dissipation the. Over 25 watts ; P & gt ; you should have DC voltage on both of the add-ons on site A power tube datasheet as maximum plate dissipation both of the max dissipation at idle is safe Dusted off a project that didn & # x27 ; s for power tubes between their sockets again Careful and make sure the amp, I measured the plate voltage tubes the plate.!
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