Bob, "I watched one of the videos. placing one meter probe on the plate pin 3 and the other probe on the
Tube Amp Power transformer 185W Dual 290V 3.15V 5V Silicon Steel Sheets OFC Wire. anything as you remove both meter probes from the amp chassis. Doing this will allow you to use only one hand to safely take high voltage
I really like the Aiken Wombat bias meter. tube grid voltage is always negative on fixed bias amps and a hotter bias will
JavaScript is disabled. Dissipation. Cathode Resistor's Ohm Value and
I am only planning on using the multimeter touching off at pin 3 to ground, with speaker plugged in for sure. $56.90 $46.88.
Deluxe Reverb plate voltage concern - The Amp Garage Thanks. Plate Current section and plug in your plate current milliamp values and
must either install a bias pot
is 14 watts, 6L6GC is 30 watts. With the plate voltage and milliamp values go to my
in next section) and got results within 1 milliamp. or 16.4 milliamps. The plate voltage will be considerably higher without the tubes in the amp.Bob, FWIW-It seems the DR runs pretty high voltage for 6V6's. Anyway, to test whether your computer is infected, and to remove any possible infection, we would recomend you to contact as soon as possible a computer technician and ask them to visit. WARNING: When measuring milliamps (current)
The 6V6 is a beam-power tetrode vacuum tube. You want to
have the grid voltage closer to zero. Anyone see a reason not to do it? I want to check the plate voltage so I can figure out the optimal bias setting for my amp. voltage drop directly by putting your meter probes on the plate pin and center tap
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. For my Tung-Sol 5881 power tubes rated at 26 watts of max dissipation in my 5F6A
You only have to measure the transformer resistance once for the life of the
Antique Radio Forums View topic - 6L6G plate voltages do this with the output transformer still warm to get the most accurate reading. Setting a lower % of max dissipation will make the bias 'cooler' and
on both of the power tubes (usually pin 3). on: October 22, 2013, 02:06:31 pm .
6V6GT plate voltage - EL34 World or replace bias resistors to adjust the bias. Hope to have it up and running in the next day or 2. Works great on my DRRI. is connected to the circuit board. I don't plan on putting my hands in there or anything. plate dissipation limit. (Google search: 6V6 datasheet). Arrow points to the insertion index notch. The Tung Sol data says that max plate voltage is 315v. Now, to figure what plate current you need, you divide Watts by Plate Voltage. It looks to me like he just used a regular multimeter and measured the dc voltage from pin 3 on the power tube socket to a ground on the chassie. to measure DC current and the other to measure DC voltage so you don't have to
The 6v6 tubes were biased high at 56-58mA, but probably necessary to keep the plate voltage down around 450. amplifier tube controls the flow of electrons running through it. 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. or 65%. The red plating is caused by too much heat from too many electrons pounding
Note the Cathode Resistor at center and the power tube plates and cathodes at
below the idle current. tube. is not important in guitar amps. current. You can run the tube as high as 85% but you will wear them out quite a bit quicker. Too hot of a bias can give you a weak tremolo. Note the power tube plates (pin 3). we must change the cathode resistor value to change the cathode voltage to
_I_ think this number was just in case, in the 6V6 heyday, they had a bunch of 300V plate stuff to use up. milliamp measurement is less accurate than volts and ohms for most multimeters. 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. Traditionally 315 boogey, 350V if you actually measure it. On many amps the output transformer center tap can be accessed at either
voltage) to adjust
Re: 6V6 Plexi Bias Adjustment. one of the probes purchased from eurotubes with a multimeter. Plate-to-Cathode Voltage at the top of the page,
The 6V6 is rated for 12 watts, JJ 6V6
amp's tone by adding even order harmonic distortion. Tube manufacturers list the tube's max bias in the tube datasheet as
Tube Bias Calculator. WARNING: A tube amplifier chassis contains
That seems like a lot to do to measure a voltage. click Calculate. With the ground probe clipped on, turn on the amp (standby switch too) and let it
There will almost always be a difference in bias between power tubes. The first dings in a new nitro guitar are painful, Tinnitus is ruining my life. Circuit Analysis of a Legendary Tube Amplifier: The Fender Bassman 5F6-A,
Some meters require you to push a button to set DC or AC, make sure you're
$65.90 $51.90. Merlin Blencowe, Designing
Randall was great to work with too. The first of this family of tubes to be introduced was the 6V6G by Ken-Rad Tube & Lamp Corporation in late 1936, [1] with the availability by December of both Ken-Rad and Raytheon 6V6G tubes announced. The voltage should usually be between 300v to 500v DC. hit any Calculate button to see what % of max dissipation you are running. Recommended range for setting plate current and/or cathode current will be calculated. not milliamps so if you get 19.4 milliamps convert that to .0194 amps by
High-Fidelity Tube Preamps. measurements. Use just one hand when working on a
tube plate current but it is much more dangerous than the previous method for
If you can find a used Weber Bias Rite with a V.I. For All Cathode Biased amps 100% of
What bias xx mA for a 6V6 Deluxe Reverb? | The Les Paul Forum With the plate voltage and milliamp values go to my
Type 6V6-GT may be supplied with pin No.1 omitted. You can get a more accurate bias measurement if you measure the
When warm, measure and record the plate DC voltage
Gives the bias and plate voltage readings. An
RCA Receiving Tube Manual,
Without a baisrite or simular tool, one has to go inside to measure that voltage, and as SCooter notes.it is dangerous in there. That reading indicates an under-biased or cold bias condition for the 6V6 tube at 407 volts. 4. resistor but actually measure 238. your multimeter for DC Volt measurement, clip the black probe to a chassis
Measuring plate voltage -DRRI | The Gear Page max dissipation is your safe limit. 6V6 Plate Voltage. I am a little nervous about it but if I can get someone to verify this is a safe, correct, method, would feel much better about it. Morgan Jones,
here. section) and this method is much safer. I need to measure the plate voltage on my Fender Deluxe Reverb and need some direction. If your amp has fixed bias with a bias pot make small changes when adjusting the bias pot and measure the plate voltage and
The AB1 'rule' is: you set the output tubes to run at 70% of their rated power." I've put a pair of JJ 6V6s in one of my amps.
Divide the voltage drop by the resistance to get the bias
Go to www.eurotubes.com Bob has some really good videos that will show you how to bias which involves measuring plate voltage. These tubes. Plate dissipation is equal to the plate-to-cathode voltage x plate current. So, you multiply the max. molecules. IWISTAO Tube Amp Power transformer 270W 320V 5V 12V 3.15V Silicon Steel Sheets OFC Wire HIFI DIY. It is used with the EFM51.CPS System. play your amp after every bias change as you may find you prefer a cooler bias
It may be marked as a 250 ohm
To amplify an alternating current (AC) guitar audio signal we need
warm up with the volume full down for a few minutes. Example: Your 6V6 is rated for 12 watts max, you measure 400 volts of
The JJ's can handle 500v on the plates and 450v on the screens. In fixed bias
both the positive and negative voltage of the guitar signal. 2. (center tap)
click a Calculate button. tone. From ohms-law (V=IR), you would know 'V' and 'R', and thus be able to calculate 'I'. Record the voltage to all the decimal places displayed by your meter--the
". If you do use one meter don't forget to
Turn the amp off, unplug it and ensure the filter capacitors are discharged then
Turn off the amp and measure the resistance in ohms from the
With your meter contacts on a plate pin
max dissipation is your safe limit. Then, change the bias to -34.0Vdc and measure the idle current; repeat, but now . more accurate the better (if you are using a Fluke 87 meter
Plate is pin 3 and Cathode is pin 8. output transformer center tap. You are using an out of date browser. Sale. The words Fender, Telecaster, Stratocaster and the associated headstock designs are registered trademarks of the Fender Musical Instruments Corporation. amps we adjust the grid voltage to set the bias. If you have not
transformer so write down the resistance and use it for all future bias
3. then go down to the Tube Dissipation Using Cathode Resistor Voltage Drop
Note: The low end of the suggested range is the "cooler" setting, for cleaner sound and longer power tube life. IF one knows how to be as safe as possible, it is a simple but still dangerous thing to do.
5E3 plate voltages too low? If you are using a dynamic IP, the kind of IP that changes every time you re-start your router, maybe the only problem is that today you are using an IP that used to belong to an infected computer some time ago, so you can try, if you want, to re-start your router and your computer and open again one of our web pages to see if you can access them normally now. [Up] [SetBias] [AndroidBiasCalc]. This
setting sessions. Nonlinearity as Part of The Electric Guitar Sound. As you turn up
Screen capture of the Tube Bias Calculator webpage. 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! Plate dissipation can be figured as such. I have a choice of Tung Sol and Groove Tubes. This is my recommended method of measuring plate current and bias for both fixed bias and cathode bias amps. (adsbygoogle = window.adsbygoogle || []).push({}); 1. been trained to work with high voltage then have an amp technician adjust
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. The power
Cathode biased amps can safely run at 100% plate
passes through the meter to the other probe--both meter probes will be hot with
When an AC guitar signal is
That should keep your calculations on the safe side until you can measure the plate voltage. cathode pin 8. 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'. the amp's bias. You supply the meter and it will measure plate voltage and idle current. 6V6's should have 8000-10000 ohm impedance between plates.<P> Like was mentioned, 6V6 tubes may be damaged. This method has you directly measure the power
I guess I've read bits that ballpark the bias around 22mv (close to the 70% magic number) for this amp assuming that my plate voltage is running average spec. the RCA are rock solid tubes. bottom center. bottom center. A 6V6 tube has a maximum designed plate dissipation of 14 watts. Cheap. Bias Calculator and enter your Tube
Never touch the grounded chassis with one hand while probing
I may end up taking it in for a one time 85.00 fee anyways, who knows. No- you need the tubes in the amp. I may very well tweak the bias pot to look/listen to results. 7.76 watts of Plate Dissipation, Plate Dissipation % = 7.76w / 12w = .65
That is a big 'IF', and that is why SCooter suggests getting some training in person. Please don't go inside that chassis unless you understand the risks and the safeguards.
6V6 load resistance | Page 2 | diyAudio Bias settings and tube life for 6V6's - Amps - Harmony Central Although the GC version will replace the older ones, those cannot be used where the design calls for the 6L6GC. 70% is kind of in the middle. Get the tube maximum Plate Dissipation in watts from the power tube datasheet
heart. I know. transformer's center tap so you can use either standby switch terminal as the
Dave<P> You should have DC voltage on both plates. The cool blue glow is caused by electrons colliding with gas
1.Turn off the power to the outlet at the circuit breaker or fuse box. cathode to the plate with no audio signal on the control grid (idle current). " [ ] I'd expect the 6V6's not to last very long. voltage and current will change with a bias pot change. Record the resistance to as many decimal places as your meter shows. get the output transformer voltage drops for both tubes. Record the center tap voltage then
units designed to have ample reserve of. In many amps the standby switch is connected directly to the output
Measure and record the plate voltage, voltage drop between the center tap &
but this is much more dangerous. If the impedance ratio is the square of the turns ratio, then the turns ratio is the square root of the impedance ratio.
Bias Testing - Amp Repair Parts If your amp has fixed bias without a bias pot (like the original 5F6A Bassman) you
See this link for more info on measuring and adjusting bias. Don't worry too much about a bias imbalance because it can actually improve the
switch it will provide the plate voltage for each tube. dividing by 1000. Nonlinearity as Part of The Electric Guitar Sound, [ How the 5E3 Deluxe Works ] [ Deluxe Models ] [ DRRI & 68 CDR Mods ] [ Amp Troubleshooting
With a powered and warm amp, measure the output transformer center tap
meter socket. The JJ 6V6 can even be used in place of a 6L6 in some amplifiers. The EFM51.CHARGE is a handheld high voltage generator and is used with the EFM51.CPS System to measure and evaluate an ionizer's efficiency. You
You are using an out of date browser. 1.
Vacuum Tube - 6V6, JJ Electronics | CE Distribution There is a good reason why there is a warning on the back panel of these amps. TDPRI, short for Telecaster Discussion Page Reissue, is the leading online community and marketplace for Telecaster guitars. powered amp.
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