tube amp volume fluctuation

VTL TL6.5 Series II Signature line stage and S-200 Signature power Amplifier. Providing an exceptionally deep resonance of sound sources of various ages and genres, the LX-380 combines LECUA* - a computerized attenuator which carefully reproduces the dynamism of each performance - with a power amplifier circuit that expresses the rich musicality of the 6L6GC output tube. Today as i turned on my rig and put the amp on from stanby (around 20 min) i start playing and the volume starts fluctuating from loud to soft and back on its own. About the attenuator. If you're only going 15 or 20 min between playing, I'd say just leave it on. If its the amp - check circuit voltages while the tape is playing if possible. What gives? Tube amp volume fluctuation 05-29-2018, 09:22 PM Hi all, I've got a Carvin Valvemaster 100W head. I thought it would be the first tube on the left, so it'd be V1, V2, V3, V4, V5 (phase inverter). The fluctuation noises originating in vacuum tubes are treated theoretically under the following headings: (1) thermal agitation in the internal plate resistance of the tube, (2) shot effect and flicker effect from space current in the presence of space charge, (3) shot effect from electrons produced by collision ionization and secondary emission, and (4) space charge fluctuations due to . How It Works. It refers to a special case of differential circuits, where a whole signal is made up of the difference of two voltages, a negative and a positive (technically speaking, only the output stage is push . Due to the simplicity of the Defender V5's all-tube circuitry, a wide range of tones can be obtained with the use of this control alone. About the attenuator. So i have had this amp since 2016 and i play it a lot. The heated elements of the tube are very fragile and get damaged easily if shaken after use. Is it the just the power tubes or something more costly!? For those who are looking for a compact amp without sacrificing power, the Blackstar HT-1R series is a great choice. Active 7 years, 7 months ago. Last week at band practice the volume started fluctuating after maybe an hour or so. Push-Pull The basic principle behind this amp is pretty cool and worth taking a look at. Before you touch anything inside the amp chassis, it's imperative that these capacitors are discharged. 1) there is a threshold level where the volume engages. Tubes generate heat: Be sure to always keep items clear of this tube amp. The result is the technology found in Flint Tremolo & Reverb. Who This is Best Suited for: The Danadelectro BT-1 is a great choice for guitarists who want to stay true to the original vintage tremolo tones of decades gone by. If you can, change sources and see if the problem goes away. This item BoyuuRange A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage BoyuuRange MT-34 MKII EL34 Tube Hi-Fi Intergrated Amplifier Push-pull Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin GE JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair Therefore the reading you get will be the sum of the current drawn by these 2 tubes. Let the amp cool off before moving it after use. Show activity on this post. If your grid amp current is working overtime, this can be spotted inside the tubes too. It had a bad hum and oscillation. That is pretty unusual for a valve amp though, hence my first reply above. Take a look at the picture on that same page. #1. The screen voltage is at its highest (most tube current) and the screen is partially bypassed by C5 (which would tend to reduce tube screen current/voltage variations, and therefore plate current variation). and 5881WXT matched pair power tubes. Is volume fluxuation typically a preamp tube? What you really need to look at is a) tube type plate voltage and then c) cathode current. I quickly ruled out all cables, pedals, guitars, FX loop jacks and cabs but the problem still continued. Keep an Ironman II Mini on your pedalboard and leave the volume wars behind. Start new topic; Recommended Posts. If it's still acting up, then change the pre tubes. Statistical fluctuation of electric charge exists in all conductors, producing random variation of potential between the ends of the conductor. But, when I use the same guitar, pedal, and cords that were just functioning correctly, but connect to a PA instead of an amp, the volume fluctuates - almost like a tremolo, but not at any particular tempo. "It (TL6.5 II) has added serious low-frequency extension and grip to the mix, moving it far closer to . Members; 4 Members; Share; Posted May 16, 2012. The Blues Junior is my main gigging amp. 596 IQ #1 . Hi-Fi+ Editor's Choice 2020. This item BoyuuRange A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage BoyuuRange MT-34 MKII EL34 Tube Hi-Fi Intergrated Amplifier Push-pull Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin GE JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair That's assuming it's biased in the acceptable range, but cold. First, change the power tubes. Yes it does, but not a whole bunch (such as twice as a loud). hopkinWFG Well-known member. The power level of the 1965 Twin Reverb Amp was also increased and it was rated at 85 watts. Noticed some weird volume fluctuations but didn't think too much of it, but ran some contact cleaner through the jacks and waited until the next day to make sure it was good to go. This is normal as well but is caused by too much gas inside the vacuum tube that makes the light appear pink. The Hiwatt as I've often said works well and sounds 'big' at all volume levels. This can be tested by plugging a cable between send and return. Discussion in 'The . BTW, I've never experienced fluctuating volume from a bad tube, but that doesn't mean the problem is not in your amp or in a source. Tube amps uses high voltage, it had very wide linear zone, 400-600V vs solid state 12-40V that significantly different sound hearing. Show activity on this post. by sg4ever . The primary reason tube guitar amplifiers are favored over solid state amps is their overdrive tone. Oscillator current variation is small compared to total signal tube plate current, so trem is at a minimum here. This can be caused by a conflict between the program or device that you are trying to watch and the TV's advanced audio settings specifically SRS TruVolume. Members; mattack. The Spark is a 40-watt amp that uses two 4-inch (4-ohm) speakers and a bass-reflex cabinet. Crackling, rustling, distortion, volume fluctuation and hum are symptoms (in any combination), but other faults cause the same symptoms, so you can't make any assumptions. Then run your effects unit, and guitar thru the borrowed amp, find out what happens. Think about a slow 1dB change in volume - this could occur in a space of 2 seconds and you just wouldn't notice it let alone over a period greater than several minutes. Dimensions W x D x H. 17.5 x 17.5 x 6 inches (44.5 x 44.5 x 15.3 cm) Weight. New! Anytime something fishy happens, you can troubleshoot it with your other tubes. The primary reason tube guitar amplifiers are favored over solid state amps is their overdrive tone. Ask Question Asked 7 years, 7 months ago. US2141944A US94215A US9421536A US2141944A US 2141944 A US2141944 A US 2141944A US 94215 A US94215 A US 94215A US 9421536 A US9421536 A US 9421536A US 2141944 A US2141944 A US 2141944A Authority US United States Prior art keywords amplifier diode output rectifier circuit Prior art date 1936-08-04 Legal status (The legal status is an assumption and is not a legal conclusion. In the beginning, there were tube amps. This little brown face Fender Princeton came to me via mail from a fellow vintage amp lover. Adjusting the guitar's volume control can have a profound effect on touch sensitive tube amplifiers. Eventually the seal breaks down and air starts to get in. By mattack, May 16, 2012 in Amps. At 7.4 by 13.7 by 7.0 inches (HWD) and 11.4 pounds, it's a smallish amp that you can take along with . The meter then measures the current flow. More common issues would also include a cold solder joint, failing plate resistor, or even a failing electrolytic cap. volume fluctuation in tube amp? Not too bad. The design combines two of my favorite tubes, the 6SN7 dual triode (actually in this case the 6H8C Russian equivalent), and the . I have a Hot Rod Deluxe (HRD) and an early silverface Bandmaster Reverb. Sep 23, 2021 #6 . sg4ever . The amp is no longer getting the volume fluctuation, the Peavey footswitch works perfectly and it is slightly quieter. But, then I came across this directly from Mike Soldano himself. Nov 29, 2011. The LX-380 represents a new era in golden '38' series vacuum tube integrated amplifiers from LUXMAN. If you are unsure of this procedure, consult your local amp tech. Purple This is a faulty tube that has an air leak. R is always in the circuit because it's lead is wired to the same terminal as the wire coming from the tube socket pin #3. snip.GIF (95.65 kB, 732x617 - viewed 343 times.) With lower voltage (24V10A) - no such thing, very nice sound, clean etc, with added bonus of amp being cool. Stick for me. The LX-380 is the first vacuum tube amplifier to feature LECUA, the proprietary computerized control attenuator from LUXMAN that enables the sound to be adjusted smoothly with minimal deterioration using an 88-step method. Tube amp volume fluctuations. For most clubs, you do not need much more power than what the amp provides. Keep an Ironman II Mini on your pedalboard and leave the volume wars behind. The Zen Triode Amplifier is hand-assembled and point-to-point wired in East Peoria, Illinois. I noticed that the power transformer got fairly hot over the two or three hours that the radio was operating even though the line voltage was reduced to 115 volts. This allows the meter to jump into the circuitry of the power amp without the need to disconnect any wires or components. The amp is in use approx 1hr every 2 days on room volume in my living room. . Listen to this article instead (14 minutes) If your amp makes no sound, it is first important to define what you mean by "no sound." To that end, the first test you should perform is whether you can hear anything coming from the speakers. MASTER VOLUME UNIT:7 KNOB MASTER VOLUME AMP UNIT EAM 120 EL34 $2450 EAM 160 6550 $2850 EAM 180 KT88 $2990 POWER UNIT:3 KNOB POWER AMP UNIT EP 120 EL34 $2450 EP 160 6550 $2850 EP 180 KT88 $2990 GZ UNITS:50-80watt Dual Tube Rectifier Amps [ GZ Units are available in fixed/adjustable or cathode bias ] Balanced Audio Technology VK80i Integrated Amplifier. a) tube types have a max dissipation; for EL-34s its 25W per. It works equally well with both balanced and unbalanced audio input sources. When I plug my electric guitar into a multi-effects pedal and from the pedal into my amp, it works perfectly. put a little bit of this stuff in the pin sockets and work the tube in and . Review By Michael Lang Of STEREO Magazine . for Spider Valve, use 12AX7B pre-amps. . volume fluctuation in tube amp? Balanced Audio Technology's first all-tube integrated is a stunning piece of industrial art that delivers over 55Wpc of pure triode power. I have seen this more than a few times with brand new amplifiers making all kinds of weird noises. 2. The tech charged me $85. Very evident while monitoring . I noticed this happening for the past couple of months. One of the best qualities of this low-watt tube amp is the Infinite Shape Feature. PAGE 3 EL-84 ALL TUBE STEREO POWER 2A SB FUSE PATENTED 4,713,624 PRESENCE VOLUME 1A SB SB STANDBY VOLUME PRESENCE HANDBUILT IN USA 20/20 DYNA-WATT POWER FRONT PANEL CONTROLS: PRESENCE: These controls "open-up" the 20/20 producing brightness and sparkle for clean sounds at higher settings or sizzle and edge when set high for distortion sounds. Pete Celi, our Lead DSP Engineer and Sound Designer illustrates the research and sound design process in the White Paper below. For example, when set in its lower ranges, the sound is clean and snappy. The new Class A - In the field of tube amplifiers, innovations are rather rare.This makes the creativity of new concepts coming from Octave all the more remarkable. Other technical design also important, most tube amps are non NFB (negative feedback), class A design vs solid state class AB, & screaming with bulky output transformer vs final transistor. Sep 22, 2021 #5 Check sockets pin hole..? Guitar Tube Amp RC Filter frequency fluctuation. So he summed up the problems being: - Grounding issues. The Micro sounds small and boxy on its own but fits perfectly in the mix with stuff like old stones numbers etc. mostly at home on the 5 watt mode. Andy. Tube Amp. So to achieve that I put my guitar volume at 2 or 3 and crank my guitar amp up to 70% or so. I. itsme Active member. Or a worn out input jack. By Rob Robinette. Has bee biased once 4 years ago. Boss GT-10 25% output, power amp Master at 75% for the tube amp gain distortion. Thanks for all the great amp info, particularly the articles on Fender's Hot Rod series. This is a big deal. « Reply #1 on: July 25, 2017, 03:34:24 pm ». 70% of that for an A/B amp (marshall) is a safe range. 53volt fluctuation? The power tube sockets are mounted directly to the steel chassis, and no push-on connections are used - all wires are soldered. The Neoteck Tube Amplifier is best suited for desktops and small spaced homes. Power Tubes are 1,5years old. I do not know this specific FX pedal very well but you can get an impression of how good it sounds based on customer . The first stage is a differential amplifier with feedback directly from the output stage. Volume Fluctuation in Marshall JCM 2555. Now then, I play alot of blues and jazz and I like clean tone with alot of dynamics, or in simpler terms volume fluctuations. The 2 Channel power output provides 50w of power on each channel to passive speakers. 2) if the tubes haven't been changed out in the last 18-20 months, then it's. probably time to change them out. While distortion is to be avoided at all costs in audio amplifiers, it is the most important aspect of guitar amplifier design. The cath. Go to an Line 6 authorized service. Does it do the same thing when the transport is not engaged? Fluctuating volume does not point towards a cleaning of tube pins and sockets as a solution. Tube 6: Plate voltage 148, no volume fluctuation I don't know what the reason is for the low plate voltage on tube 4 but the radio still played satisfactorily. This is happening randomly and is irrespective of source. *dun . My experience with feeding cheap/weak ClassD amps (Alientek D8) was that with higher voltage (36V) I got mildly harsher sound, to the degree it wasn't listenable to me. Tube Guitar Amp Overdrive. Also, are you detecting a shift in the stereo image toward the same speaker when the volume fluctuates, or does it stay centered. Recently, I have been noticing the volume has been fluctuating. It comes in an impressively thick, powder-coated steel chassis that measures 8" H (with tubes) × 6.125" W × 12" D and weighs 17lb. When the amp is used for prolonged periods of time, the tubes will generate a considerable amount of heat. We examined the sonic complexities and tonal interplay, and accounted for every last detail in our hand-crafted algorithms. It is a laborious job that requires steady hands and patience but by changing the sockets with higher quality phenolic or better yet ceramic, you will be . Crush Pix 3 and Hiwatt 100. Borrow an amp from a friend and play your guitar through it, does the flucuation happen at that point. While distortion is to be avoided at all costs in audio amplifiers, it is the most important aspect of guitar amplifier design. . 9 replies to "Blues Jr Settings". - Footswitch contact replaced. It, too, has existed for hundreds of years as a musical technique, but for our purposes it is a much more recent technical innovation used in amplifier design. October 2021. Dangerous for those 50V caps. The step attenuators from Goldpoint make good volume controls for this stage. Perfect for mid-powered tube amplifiers up to 30 watts, this mini version of our popular 100-watt version attenuates your amp's volume via the same reactive load and transformer-coupled technology as its big brother. If old amp maybe filter caps drying out? Any . I is the observed current in the thermocouple, k is Boltzmann's . « Reply #1 on: July 25, 2017, 03:34:24 pm ». The amp has 2 Pre amp tubes, 2 power tubes. The cath. Basic Rule of any Tube Amp with a Master Volume: If you want the maximum breakup = Crank the Volume + Use the Master Volume to control the overall Volume. So, what could be wrong. At that point I wiggle every cable, rotate every pot, tap on the chassis; nothing. Re: Rob Robinette mod I don't understand. (currently Electro Harmonix Tube El34). Speed can be adjusted to create alternating volume fluctuation rates, while the depth controls affect the range at which that signal is . As the Volume control is turned up, light overdrive is The effect of these fluctuations has been measured by a vacuum tube amplifier and thermocouple, and can be expressed by the formula Ī<SUP>2</SUP>=(2kTπ)∞R(ω)|Y(ω)|<SUP>2</SUP>dω. Volume fluctuation on marshall mini jubilee head. hide 6 . If you're confident in working on a live tube amp then taking measurements to check the PI is straightforward, but one probe slip could cause far more damage either to the . 46lbs (20.86Kg) unpacked, 57lbs (25.85Kg) fully packed. Volume Problems / Fluctuations Why does my volume go up and down on its own? The main culprit on mine was the effects loop return jack. The tube amp has moved into a secondary position in my listening rack. If you are new to tube amps you need to play around with the guitar volume control to learn its effects on touch sensitivity and pick attack. Bottom Line: With a simple design, vintage aesthetics, and the ability to produce thick sounding tremolo, the Dandelectro BT-1 is a great little pedal. 10 years ago . The GE100 is capable of amp modeling, i. e. emulating the behavior of a certain amp. I recently experienced sudden and severe volume drop in my lovely Engl Powerball. Volume fluctuating - guitar wiring or amp problem? Posted May 16, 2012. mattack. I've got an old two-channel Mesa Boogie Dual Rectifier. It starts for no reason, gradually fading to zero. Thread . I have several questions about your HRD column. Perfect for mid-powered tube amplifiers up to 30 watts, this mini version of our popular 100-watt version attenuates your amp's volume via the same reactive load and transformer-coupled technology as its big brother. On amps with 4 power tubes, you're reading the current through 2 tubes. Take a look at the picture on that same page. Roll the volume down or put it on standby. When listening to music in the car via Bluetooth through the car's speaker system, the volume keeps fluctuating down and back up to where it was before. The most dangerous voltages are stored in electrolytic capacitors, even after the amp has been unplugged from the wall. VOLUME: This control determines the overall volume level of the amplifier. On amps with 2 power tubes, you're reading the current through one of the tubes. With robust construction, a wide range of tones, and steadfast controllability, the Sonzera 50 is a solid gig- and studio-worthy amplifier. As long as the meter really is lower impedance, this works. Okay, in a SLO, when you are looking at the amp from the front, is preamp position V1 on the far left or right? Ironman II Mini Attenuator. The LX-380 uses the same high sound quality semiconductor circuit that has been successfully proven in integrated . It connects through bluetooth to your Mac or PC and provides 4.2 stereo audio amplification. The Sonzera 50 comes as both a head and a 1x12 combo. My amp has been working great for 2+ years until my sunday night jam my volume dropped suddenly in the middle of a passage. Re: Tube amp volume fluctuation? Check the bias, rec/palyback heads for hi oxide build up. As a 1 watt, all-tube model, this amp can provide all the benefits and features of a 100-watt amp set to low volume. I use an android with lollipop. Make sure it's not either the heads or the tape itself. Tubes can act intermittently, but only for a short time before they fail. First started playing the amp at a band practice probably a month after i bought it. Common Tube Amp Malfunctions: My amp makes no sound. Hi. 4,643 . Recently it started completely dropping in volume, either warmed up or cold, without crackling, static etc.. It is characterized by similarly labeled parameters, including depth (the amount of volume variation) and speed (how quickly fluctuations in volume are varied; also variously labeled as . The guitar tone control affects the guitar audio signal's tone through the entire amplifier. Viewed 458 times . I have an Onkyo P3000R pre-amp which I bought second-hand a few months ago. next jam session, volume cut out a few times. sg4ever [a] Join date: Jul 2006 . Re: Rob Robinette mod I don't understand. It looks like some cloudy purple haze from gasses that are mixing with outside ions in the air. Each channel employs a single triode-wired, self-biasing, self-balancing 6N15N output tube, which is the electrical . A power of 10 − 7 W is easily audible for suitable frequencies in a telephone, and a 10,000 × linear amplification, i.e., a 10 8 times power amplification is nothing extraordinary, so that an initial power of 10 − 15 W can still easily be observed. By Rob Robinette. Old tape can exhibit drop out that will produce the volume fluctuations you mentioned. 75 Watt RMS Triode Tube Amps - Joule -100 28 Watts SET Tube Amps - Joule- 65. The vibrato was actually misnamed; instead of producing pitch fluctuation like a true vibrato, the effect can be more accurately described as tremolo, which is cyclic volume fluctuation. - Removing a ribbon cable that wasn't supposed to be there. This is why it's a good idea to always keep your old tubes handy, or have a bunch of spares lying around. I've just discovered that it's also happening through the headphone socket. My tone is also down between 2 typically to 7 at most and the treble on my amp is at 75% or so for a good portion of my songs. As the above clearly demonstrates, Coincident amplifiers are designed with massive energy storage capabilities (significantly using polypropylene filter capacitors exclusively) and as a result, sound much more powerful than their wattage ratings suggest. . Or, the elements within the tube eventually crack from the temperature fluctuation. This may sound a bit or a lot different from what the actual amp sounds like, because modeling is not perfect. What I did was douche all the jacks in the amp with electronic contact cleaner/lube and ram a guitar cable plug in & out of them about 20 times. Because of this, we recognize that a thermal motion of electricity which corresponds to an initial power of about 10 − 17 W lies already . Click to copy post link It sounded okay when I got it out of the box earlier today, but I'm noticing my . Warning: All tube amplifiers contain lethal voltages. Octave V 70 Class A Integrated Amplifier Review Merging Class A sound with the performance of an AB circuit. Some modern amps can exhibit this sporadic crackling from the lower quality tube sockets. The first concerns the volume fluctuation issue. While the fluctuation is occuring, adjust the knobs on the amp, could be a dirty potentiometer, and it could be any one of them. 2. I'm having an issue which renders the app useless. I investigted some patch cables in my . Dirty contacts on an effects loop jack can cause volume fluctuations. The body is designed with a solid aluminum chassis for long term use. By 1965, the Fender Twin had reverb and vibrato added to the amp. A bias meter is a device that can measure current in a tube amplifier. This amp is called a 6V6 Push-Pull amp, the 6V6 being the tube model, but what's this push-pull business? R is always in the circuit because it's lead is wired to the same terminal as the wire coming from the tube socket pin #3. snip.GIF (95.65 kB, 732x617 - viewed 343 times.) Tube Guitar Amp Overdrive. Tube amp volume fluctuations. Ironman II Mini Attenuator. It uses a set of probes that are plugged into the tube sockets and the tubes are then plugged into the probes.

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