6l6 screen voltage

Peak Heater-Cathode Voltage 6L6 6L6-GC; Heater negative with respect to cathode: 180 max: 200 max: volts: Heater positive with respect to cathode: 180 max: 200 max voltage scale and grid-bias parameters are multiplied by 300/250 = 1.2. The effects of contact potential are not considerd in this Note; however, they become gerioug only for small control-grid bias voltages. Fig. 2 is the plate family of a 6L6 for a screen voltage of 250 volts. At any plate voltage, the ratio of the plate current (1b) at a

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  • The voltage and power rating of the 6L6 series were gradually pushed upwards by adding features such as a Micanol base, thicker plates, thicker grid wires, grid cooling fins, and special ultra-black plate coatings. The original metal version was rated for 19 watts dissipation while the later 6L6GC is usually rated for 30 watts.
  • 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. At the time Philips had already developed and patented power pentode designs, which were fast replacing power triodes due to their greater efficiency. The beam tetrode design of the 6L6 allowed RCA to circumvent Philips' pentode patent. May 26, 2013 · When the Peavey XXX came out, it came stock with 6L6GC power tubes. 6L6 tubes are generally more efficient than EL34's and don't pull as much screen current and the screens can handle 450 to 500v. The XXX came with 100 ohm screen resistors (which is very low even for 6L6). EL34 based amps come with 1.0K and up to 2.0K in some cases.
  • The screen voltage, which has a much greater influence on plate current, is represented by 4 curves. With the screen at 180 volts the grid voltage swings from a minimum of -6 volts to a maximum of zero volts. At a screen voltage of 60 volts the grid swings only between -2.4 volts and zero.
  • The purpose of the choke in these type supplies is not for filtering and voltage regulation, but just for filtering the DC supply to the screen grids of the output tubes and the preamp section. The screens typically take around 5-10mA each, and the preamp tubes draw about 1-2mA or so (for the typical 12AX7; 12AT7's are usually biased for around ten times that).
  • The same article recommending the 6AG7 also stated, and I quote: "Regardless of the circuit selection, use regulated screen voltage if good keying is desired." Needless to say, very few (if any) of the crystal oscillators in commercial gear produced in the 50's and 60's used regulated voltage on the oscillator screen.
  • Chapter 14 VACUUM TUBE RECEIVERS AND TRANSMITTERS The transmitter described in this chapter uses the most ancient vacuum tube technology I could, while still sounding pretty good on the air. Some of the parts I used were rare and unobtainable as new parts. However, if you can’t find similar components at local swapfests,
  • May 26, 2013 · When the Peavey XXX came out, it came stock with 6L6GC power tubes. 6L6 tubes are generally more efficient than EL34's and don't pull as much screen current and the screens can handle 450 to 500v. The XXX came with 100 ohm screen resistors (which is very low even for 6L6). EL34 based amps come with 1.0K and up to 2.0K in some cases.

The power circuitry (power trafo, filter caps, voltage divider caps) in Deluxe Reverb are capable of handling the extra current that 6L6 tubes will pull from it. Ths Deluxe AB763 has a plate voltage of 410V and if you insert 6L6GC you still won’t be so loud as Vibrolux or Super Reverb with 440V and 460V plate voltage. Looking at the various data sheets, I decided on the following five values of plate voltage (i.e. the DC voltage between plate and cathode pins): 250v, 275v, 300v, 325v, and 350v. At each plate voltage I varied the bias voltage and collected data on power out (in the 8Ω load), harmonic distortion, plate and screen dissipation, and current levels.

Name: 6L6GC Use: Glass octal tube type used in the output stage of audio amplifying equipment, especially units designed to have ample reserve of power-delivering ability. This tube, like other power-handling tubes, should be adequately ventilated. 6L6GC can be used in place of type 6L6 and may be supplied with pin 1 omitted. (*)These specifications are provided 'as-is', with no warranty of any kind. Use of these parameters shall be entirely at the user's own risk.

Name: 6L6GC Use: Glass octal tube type used in the output stage of audio amplifying equipment, especially units designed to have ample reserve of power-delivering ability. This tube, like other power-handling tubes, should be adequately ventilated. 6L6GC can be used in place of type 6L6 and may be supplied with pin 1 omitted.

No modulation is applied directly to the screen voltage via this resistor or any other path, other than through parasitic coupling effects and interactions between the plate voltage and the screen voltage that occur within the tube itself as electrons pass through the screen on their way to the plate. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. My recommended bias measurement method is the "Output Transformer Resistance Method." You measure the output transformer's voltage drop and resistance to calculate the bias current. voltage scale and grid-bias parameters are multiplied by 300/250 = 1.2. The effects of contact potential are not considerd in this Note; however, they become gerioug only for small control-grid bias voltages. Fig. 2 is the plate family of a 6L6 for a screen voltage of 250 volts. At any plate voltage, the ratio of the plate current (1b) at a

Peak Heater-Cathode Voltage 6V6 6V6-GT; Heater negative with respect to cathode: 100 max: 200 max: volts: Heater positive with respect to cathode: 100 max: 200 บ max I see my mistake with reading the voltage taps. I did another test earlier with the CT as the ground reference and it read the normal 395 volts AC it should be producing. So my problem could be the increase in current from swapping screen resistors, coupled by the lesser voltage drop from the SS diodes. Peak Heater-Cathode Voltage 6V6 6V6-GT; Heater negative with respect to cathode: 100 max: 200 max: volts: Heater positive with respect to cathode: 100 max: 200 บ max .

The voltage and power rating of the 6L6 series were gradually pushed upwards by adding features such as a Micanol base, thicker plates, thicker grid wires, grid cooling fins, and special ultra-black plate coatings. The original metal version was rated for 19 watts dissipation while the later 6L6GC is usually rated for 30 watts. The 6L6 family of tubes can be used for ultra-linear connection, but only safely and reliably at reduced voltages not exceeding rated screen-grid voltage. More suitable 6L6 style types include 5881 and 7027A - see manufacturers' data sheets for typical circuit values. Name: 6L6GC Use: Glass octal tube type used in the output stage of audio amplifying equipment, especially units designed to have ample reserve of power-delivering ability. This tube, like other power-handling tubes, should be adequately ventilated. 6L6GC can be used in place of type 6L6 and may be supplied with pin 1 omitted. The voltage and power rating of the 6L6 series were gradually pushed upwards by adding features such as a Micanol base, thicker plates, thicker grid wires, grid cooling fins, and special ultra-black plate coatings. The original metal version was rated for 19 watts dissipation while the later 6L6GC is usually rated for 30 watts.

So doing the math Telekaster suggested, with plate voltage of 440 DC volts. I did not measure my amp with 6L6's, but have some reason to believe that the plate voltage is constant. 6L6 (25 watt) 25/440= .056 = 56mA of current KT-88 (50 watt) 50/440= .113 = 113mA of current I am running these tests to find out if my amp is running too hot. The plate-to-cathode voltage is therefore 288V. These two endpoints create the orange line. The intersection of these perspectives puts the screen voltage in the vicinity of 300V with a 200Ω "self-bias resistor," which is included as an example design in an RCA 6L6 data sheet. Screen voltage is a recurrent topic on this Forum. If you search you should get lots of hits. In practice, screen voltage can exceed plate voltage, at idle. The reason is Ohms' Law applied to the typical B+ circuit: screens and plates draw B+ from the same source, in parallel. Yes there are dropping resistor(s) and/or a choke to the screens.

S ome output tubes (211 and 845) need a very high drive voltage with low distortion. Some tube freaks have used the 300B tube as a driver but it is very expensive. Others have tried to use a triode connected EL34 but it is not linear enough. A pentode driven on the screen grid is very linear. Title: 6L6 Author: RCA Subject: FP-1999-02-28 Created Date: 2/24/2002 7:46:40 PM

Title: 6L6 Author: RCA Subject: FP-1999-02-28 Created Date: 2/24/2002 7:46:40 PM The power circuitry (power trafo, filter caps, voltage divider caps) in Deluxe Reverb are capable of handling the extra current that 6L6 tubes will pull from it. Ths Deluxe AB763 has a plate voltage of 410V and if you insert 6L6GC you still won’t be so loud as Vibrolux or Super Reverb with 440V and 460V plate voltage. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. My recommended bias measurement method is the "Output Transformer Resistance Method." You measure the output transformer's voltage drop and resistance to calculate the bias current.

Plate Voltage 250 V Grid 2 Screen Voltage 250 V Grid 1 Control Voltage* -14 V Peak AF Grid 1 Control Voltage 14 V Zero Signal Plate Current 100 mA Maximum Signal Plate Current 105 mA Zero Signal Grid 2 Screen Current (avg) 15 mA Transconductance (nominal) 11,000 µS Load Resistance 2000 Ohms Output Power at 5% distortion 10 W

Screen Voltage: The screen voltage is usually set by a dropping resistor in the HT supply (Rg2) (see the section on smoothing and filtering), or a choke, plus a small screen-grid stopper. This will place the screen voltage at roughly the same voltage as the anode, or a little lower. Name: 6L6GC Use: Glass octal tube type used in the output stage of audio amplifying equipment, especially units designed to have ample reserve of power-delivering ability. This tube, like other power-handling tubes, should be adequately ventilated. 6L6GC can be used in place of type 6L6 and may be supplied with pin 1 omitted.

voltage scale and grid-bias parameters are multiplied by 300/250 = 1.2. The effects of contact potential are not considerd in this Note; however, they become gerioug only for small control-grid bias voltages. Fig. 2 is the plate family of a 6L6 for a screen voltage of 250 volts. At any plate voltage, the ratio of the plate current (1b) at a The plate voltage limit is 750 volts and the screen grid limited to 300 volts. Because of the 300 volt screen grid voltage limit, the 807 cannot be triode connected for high power applications. Failure to observe this precaution will cause screen grid failure.

Dec 12, 2008 · A certain amount of flexibility can be had by adjusting the screen grid potential to accommodate a given primary impedance. As the screen grid voltage is raised or lowered, the characteristic curves expand or contract in the vertical direction. The optimum screen voltage is the one that places the knee of the Vg1 = 0 curve on the load line. The 6L6 valve incorporated a number of new elements into the design: Critical distance: One of the concepts introduced into the 6L6 valve was that of the critical distance. A British engineer named J. Owen Harries is believed to have discovered that there was a critical distance between the anode and screen-grid in a valve. With the XXX, JSX and Bugera amps that are switchable from 6L6's to EL34's you may find that some sets of 6L6's will not bias up high enough and in this case you should adjust the bias down as low as it will go, then switch into the standby mode and set the bias selector to the EL34 mode. Dec 31, 2014 · There are many web sites that explain setting bias. The best way is to observe the live current. Here is s video to simplify the process. 6L6 current-voltage problem Hi, I have a bassman clone I'm building and my tubes, russian 6L6's are glowing red at 420 volts and 47mA of current. When I add more negative bias voltage to get the red out, the plate voltage goes up to about 470v with only 22mA.

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  • The 6L6 valve incorporated a number of new elements into the design: Critical distance: One of the concepts introduced into the 6L6 valve was that of the critical distance. A British engineer named J. Owen Harries is believed to have discovered that there was a critical distance between the anode and screen-grid in a valve.
  • The two high-voltage supplies and the two low-voltage supplies are sufficient to analyze practically any kind of vacuum tube. For example, a true pentode such as the EL34 uses the high-voltage supplies for its plate and screen grid, and the low-voltage supplies for its control and suppressor grids. Mar 24, 2019 · Another component, called a control grid, is placed between the anode and the cathode, and it looks like a mesh or screen. By adjusting the voltage applied to the control grid, you can control the flow of electrons. You might also like this HumbuckerSoup article: Power Tube Differences: EL84, EL34, & 6L6 A frequency generator was used to measure voltage gain and plot the frequency response from 10Hz to 20kHz. The input voltage was measured at the 6L6GC control grid (g1) and the output voltage was measured at the output transformer secondary winding while connected to an 8 ohm load.
  • •Screen voltage – 135V was shared with bias – all chopped AC •Signal voltage is full cycle •Transconductance inferred by reading difference between two legs of the bridge •Special tubes (6L6) required for calibration •No electrolytic capacitors were needed 12
  • supply. Screen voltage is derived from the HV bus via a 6800Ω dropping resistor. Power from the amplifier plate is coupled to a Pi-network consisting of L1 and the TUNE and LOAD capacitors. The output tuned circuit suppressed the radiation of harmonic energy and matched the high-impedance plate circuit to 50 ohms. .
  • 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. At the time Philips had already developed and patented power pentode designs, which were fast replacing power triodes due to their greater efficiency. The beam tetrode design of the 6L6 allowed RCA to circumvent Philips' pentode patent. This pair of 6L6 made in France under the Neotron brand name is functional and will work in a vintage amp equipped with 6L6 tubes.The aesthetic condition is not good (stained tube). These tubes have already been used but are working properly.Warning : these old 6L6 cannot be mounted in a "modern"... The screen voltage, which has a much greater influence on plate current, is represented by 4 curves. With the screen at 180 volts the grid voltage swings from a minimum of -6 volts to a maximum of zero volts. At a screen voltage of 60 volts the grid swings only between -2.4 volts and zero. Google form multiple choice answer
  • •Screen voltage – 135V was shared with bias – all chopped AC •Signal voltage is full cycle •Transconductance inferred by reading difference between two legs of the bridge •Special tubes (6L6) required for calibration •No electrolytic capacitors were needed 12 Nov 21, 2009 · Tried disconnecting the Anode plate voltage and left the screen voltage in place. Result. The oscillator was perfectly stable with excellent shape. Measured voltages with Anode disconnected. Screen Voltage Key up = 219volts Screen Voltage Key down = 173volts Note that the 173 volts is a full 219 - 173 = 46volts drop.
  • Aug 15, 2008 · Your first question concerns the plate voltage applied to the tubes. 427 VDC is a pretty moderate voltage for most full-sized output tubes (6L6, EL34, 6550, KT66, etc.), so it should not pose a problem for the KT66s. . 

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A frequency generator was used to measure voltage gain and plot the frequency response from 10Hz to 20kHz. The input voltage was measured at the 6L6GC control grid (g1) and the output voltage was measured at the output transformer secondary winding while connected to an 8 ohm load. (6L6GC 470 Ohm Screen Resistor Wattage Rating ) Just going with Fender spec from my vibrosonic schem; 470 ohm, 2W, if that helps A higher wattage resistor won't make a difference as you probably know, plus you could put 1 watter's in there with 6L6's and they will still be ok. hope that helps.

Calibration configuration uses the 6L6 tube setup: H-S-5-3-4-8-1. Leave the bias and shunt controls at zero unless otherwise indicated. Function switch at ‘A’. Line calibration, Signal Voltage, Plate Voltage, High Screen Voltage For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. My recommended bias measurement method is the "Output Transformer Resistance Method." You measure the output transformer's voltage drop and resistance to calculate the bias current.

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May 26, 2013 · When the Peavey XXX came out, it came stock with 6L6GC power tubes. 6L6 tubes are generally more efficient than EL34's and don't pull as much screen current and the screens can handle 450 to 500v. The XXX came with 100 ohm screen resistors (which is very low even for 6L6). EL34 based amps come with 1.0K and up to 2.0K in some cases.

May 28, 2010 · A B+ of 380V is the minimum screen Voltage that will enable EL34 (6CA7) and KT88 to achieve maximum specified power, with minimum current through the screen. A screen Voltage above 400V will not enable the valves to give greater power than specified.

Apr 03, 2018 · Since voltage gain is directly proportional to transconductance, the EL34 would have about 2.34 times the gain of a 6L6GC in the same circuit. The EL34 (the KT77) power pentode was introduced by Mullard in 1953 — unlike the 6L6, the EL34 has its suppressor grid connection brought out to a separate pin (pin 1) as shown Figure 3. Screen Voltage: The screen voltage is usually set by a dropping resistor in the HT supply (Rg2) (see the section on smoothing and filtering), or a choke, plus a small screen-grid stopper. This will place the screen voltage at roughly the same voltage as the anode, or a little lower.

Chapter 14 VACUUM TUBE RECEIVERS AND TRANSMITTERS The transmitter described in this chapter uses the most ancient vacuum tube technology I could, while still sounding pretty good on the air. Some of the parts I used were rare and unobtainable as new parts. However, if you can’t find similar components at local swapfests,

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I see my mistake with reading the voltage taps. I did another test earlier with the CT as the ground reference and it read the normal 395 volts AC it should be producing. So my problem could be the increase in current from swapping screen resistors, coupled by the lesser voltage drop from the SS diodes. Aug 15, 2008 · Your first question concerns the plate voltage applied to the tubes. 427 VDC is a pretty moderate voltage for most full-sized output tubes (6L6, EL34, 6550, KT66, etc.), so it should not pose a problem for the KT66s.

The screen voltage, which has a much greater influence on plate current, is represented by 4 curves. With the screen at 180 volts the grid voltage swings from a minimum of -6 volts to a maximum of zero volts. At a screen voltage of 60 volts the grid swings only between -2.4 volts and zero.

The biasing of the tube is set to about 70% of max power with a plate voltage that is closer to what the vintage amps had than what is often used today. The bias voltage is set low to allow for early breakup, and the screen voltage is filtered for added noise reduction. 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. At the time Philips had already developed and patented power pentode designs, which were fast replacing power triodes due to their greater efficiency. The beam tetrode design of the 6L6 allowed RCA to circumvent Philips' pentode patent. Pentodes connected as Triodes 16 Screen grid voltage is not fixed anymore, but swings with anode Screen/shielding function of g2 is disabled Screen grid area effectively added to anode area Possible screen grid connections Screen grid connected to anode Preferred method to connect g2!

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Plate Voltage 250 V Grid 2 Screen Voltage 250 V Grid 1 Control Voltage* -14 V Peak AF Grid 1 Control Voltage 14 V Zero Signal Plate Current 100 mA Maximum Signal Plate Current 105 mA Zero Signal Grid 2 Screen Current (avg) 15 mA Transconductance (nominal) 11,000 µS Load Resistance 2000 Ohms Output Power at 5% distortion 10 W

Dec 11, 2011 · The basic answer is that it depends on the Plate voltage, screen voltage and the load. If the plate and screen voltages are within spec and the load (i.e. OT primary impedance) does not cause the 6V6 to exceed the max. plate dissipation, it can be done by re-biasing, but you need to know what you are doing.

  • May 26, 2013 · When the Peavey XXX came out, it came stock with 6L6GC power tubes. 6L6 tubes are generally more efficient than EL34's and don't pull as much screen current and the screens can handle 450 to 500v. The XXX came with 100 ohm screen resistors (which is very low even for 6L6). EL34 based amps come with 1.0K and up to 2.0K in some cases.
  • May 28, 2010 · A B+ of 380V is the minimum screen Voltage that will enable EL34 (6CA7) and KT88 to achieve maximum specified power, with minimum current through the screen. A screen Voltage above 400V will not enable the valves to give greater power than specified.
  • This pair of 6L6 made in France under the Neotron brand name is functional and will work in a vintage amp equipped with 6L6 tubes.The aesthetic condition is not good (stained tube). These tubes have already been used but are working properly.Warning : these old 6L6 cannot be mounted in a "modern"...
  • The purpose of the choke in these type supplies is not for filtering and voltage regulation, but just for filtering the DC supply to the screen grids of the output tubes and the preamp section. The screens typically take around 5-10mA each, and the preamp tubes draw about 1-2mA or so (for the typical 12AX7; 12AT7's are usually biased for around ten times that).
  • 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. At the time Philips had already developed and patented power pentode designs, which were fast replacing power triodes due to their greater efficiency. The beam tetrode design of the 6L6 allowed RCA to circumvent Philips' pentode patent. PLATE AND VOLTAGB OPERATION OF THE 6L6 Equal plate- and screen-voltage operation of a power output tet- rode or pentode is desirable because (1) the plate current of the output tube can be used to obtain proper excitation of the field coil of a loud- speaker and (2) inverse-feedback circuits can be employed to reduce dis-

Looking at the various data sheets, I decided on the following five values of plate voltage (i.e. the DC voltage between plate and cathode pins): 250v, 275v, 300v, 325v, and 350v. At each plate voltage I varied the bias voltage and collected data on power out (in the 8Ω load), harmonic distortion, plate and screen dissipation, and current levels. News :: Solid-state equivalent of 6L6 and 12AX7 tubes from AMT Electronics - AMT Electronics worldwide internet shop. Buy directly from AMT Electronics. Supposedly due out in spring of 2014. I'll bet the power "tubes" never happen and if they do they won't sound like real tubes. .

Screen voltage is a recurrent topic on this Forum. If you search you should get lots of hits. In practice, screen voltage can exceed plate voltage, at idle. The reason is Ohms' Law applied to the typical B+ circuit: screens and plates draw B+ from the same source, in parallel. Yes there are dropping resistor(s) and/or a choke to the screens.

or 44W for the pair. Grids are about -26V. I can move grid voltage down to almost -22. Where do these "belong"? The OT is a Stancor A-3801, the fabled Trainwreck iron, 6600 ohm primary. Screen voltage is around 350V. mA are calculated based on the voltage drop between the plate and CT of the OT. I know the Ohms on each half of the winding.

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6L6 current-voltage problem Hi, I have a bassman clone I'm building and my tubes, russian 6L6's are glowing red at 420 volts and 47mA of current. When I add more negative bias voltage to get the red out, the plate voltage goes up to about 470v with only 22mA. Jun 26, 2013 · It also may not sound as good, because the screen voltage should ideally be decreased so the loadline intersects the "knee" of the curves if not, the nonlinearity increases drastically. The bottom line is that you have to take into account not only the plate voltage and plate current, but also the primary impedance to find out the safe bias area.

No modulation is applied directly to the screen voltage via this resistor or any other path, other than through parasitic coupling effects and interactions between the plate voltage and the screen voltage that occur within the tube itself as electrons pass through the screen on their way to the plate. Screen (grid 2) voltage (shown between 3 and 4) is well above our B+ (350 volts) so we are within the allowed limits there too. For maximum power dissipation, we can add 3 and 4 together for a total of 32.5 watts. How Vacuum Tubes Work by Eric Barbour - [Inside a Tube] - [Why are Tubes Still Used] - [Using Tubes] The BASICS. Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current.

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Dec 11, 2011 · The basic answer is that it depends on the Plate voltage, screen voltage and the load. If the plate and screen voltages are within spec and the load (i.e. OT primary impedance) does not cause the 6V6 to exceed the max. plate dissipation, it can be done by re-biasing, but you need to know what you are doing.
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I see my mistake with reading the voltage taps. I did another test earlier with the CT as the ground reference and it read the normal 395 volts AC it should be producing. So my problem could be the increase in current from swapping screen resistors, coupled by the lesser voltage drop from the SS diodes. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. My recommended bias measurement method is the "Output Transformer Resistance Method." You measure the output transformer's voltage drop and resistance to calculate the bias current.

Jan 04, 2020 · Plate voltages on 6L6 is 290 VDC under load, screen, 210 on one 6L6 screen but 140 VDC on the other screen under load. The transformer on this is 600VAC where as the design is 800 VAC. B+ coming out of the pi network is only 290 vdc under load. .