Posted by admin | Posted in Uncategorized | Posted on 09-03-2010
Tags: electronics, tube, tubes, vacuum, valves
Tetrode Tubes
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4-125 AMPEREX TETRODE VACUUM TUBE – Ham Radio $49.00 |
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(2) Used RCA 3D22 & 3D22A Thyratron Gas Tetrode Tube NR $19.99 |
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GE RCA Motorola Tetrode Amplifier Radio Tube 8072 4657 $9.99 |
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Eimac Varian Model: 7034 4X150A Tetrode Tube $6.95 |
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Set of 2 GE NOS 5V6GT Beam Power Tetrode Vacuum TUBES $3.99 |
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6P1P-EV / 6AQ5 / EL90 Tetrode Tube SSVETLANA Tubes NEW! $89.00 |
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Q-1P/41 UNITRA = GU-43B GU43B Tube Generator Tetrode $55.55 |
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6P7S / G-807 Beam Tetrode Tubes 100 pcs $350.00 |
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(3) NOS & Used 22 Sharp Cutoff Tetrode Tube N/R $9.99 |
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Pair Nos/Nib Rca 6012 Gas tetrode Thyratron Vacuum tube $9.99 |
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(2) Used GE 6012 Gas Tetrode Thyratron Tube N/R $9.99 |
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Nos Amperex (Holland) 7983 Dual Tetrode Tube N/R $4.99 |
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6R3S-1 Double Beam TETRODE TUBES NOS LOT OF 4 $24.99 |
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6P13S ~ EL36 / 6GC6 Beam Tetrode Tubes NOS Lot of 8 $15.00 |
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WESTINGHOUSE BEAM POWER TETRODE TUBES TYPE 6939 NIB $25.00 |
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2 NOS/NIB Russian Tubes TETRODE GMI-6, TWO OR MORE! $9.00 |
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QV04-7 CV309 Mullard Tetrode Tube Lots of 10 500 avail $59.90 |
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Mullard Tetrode Pulse Beam Power Amp Tube 11E3/CV73 $39.99 |
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Telefunken RS291 Tetrode Radio Transmitter Vacuum Tube $225.00 |
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TRANSMITTING TETRODE AMPLIFIER VAC.TUBE 6079/QB5-1750 $58.00 |
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1 VSI 829B Twin Beam Power Tetrode Tube ~ NOS NIB ~ $11.95 |
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6P37N-V 6P37NV TETRODE TUBE NEW LOT OF 10 $129.00 |
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GKE-100 Russian Power Tetrode Tube RARE USSR 1pc. $49.99 |
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6P1P-EV 6AQ5 EL90 Tetrode Tube Svetlana Tubes NOS 22pcs $32.00 |
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G-807 807 Beam Tetrode Tubes NOS Lot of 4 TESTED! $18.00 |
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New 6P41S USSR Output Beam tetrode Tube 14Watt $1.50 |
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Vintage RCA 3E29 Transmitter Tube – Double Tetrode $2.49 |
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GE NOS 25AV5GT Beam Power Tetrode Vacuum TUBE $2.95 |
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2 NOS RUSSIAN TUBES DOUBLE BEAM TETRODE 6R3S-1 $10.00 |
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6P1P-EV / 6AQ5 / EL90 Tetrode Tube Svetlana Tubes NOS $8.00 |
All about Guitar Amplifiers
Guitar amplifiers are electronic amplifiers designed to be used with electronic musical instruments, such as an electric guitar.
Guitar amplifiers are mainly made in two major forms. The combination (or combo) amplifier has the amplifier head and guitar speakers in a single unit. The amplifier head or amp head contains the electronic circuitry constituting the preamp, built in effects processing, and Power Amplifier.
In the second form, the amplifier head is detached from the speakers, and joined by cables. The separate amplifier is known as an amplifier head, and is normally located on top of one or more loudspeaker enclosures. This separate amplifier head when placed on top of a guitar speaker enclosure or guitar speaker cabinet forms an amplifier stack or amp stack.
Instrument amplifiers Types
An extensive range of instrument amplifiers can now be used with the electrical guitar. Some are for general purpose and some designed for specific instruments and even for a definite sound. These comprise: Traditional guitar amplifiers which generate a clean, warm sound a sharp treble roll off at 5 kHz or less and bass roll off at 60 to 100 Hz. It has presets with built in reverb and tremolo (vibrato) units.
These types are often used by traditional rock, blues, and country musicians. Chances are that when on higher volume level the sound can get distorted. So to counter higher end bass amplifiers at times include compressor or limiter features, and an XLR DI output to patch the bass signal directly into a mixing board. To keep the bass amplifiers cool they are often provided with external metal heat sinks or fans.
Keyboard amplifiers, have a low distortion rate and also to make things easy for its functioning it has a simple onboard mixer. This assists the keyboardists to control the tone and level of several keyboards.
Acoustic guitar amplifiers are intended solely to produce a clean, transparent, acoustic sound when being used with acoustic instruments with built in transducer pickups and microphones.
In addition to a 1 by 4 inch input jack, some instrument amplifiers bear an additional input jack for inserting microphone. This is known easily as it will use a three pin XLR connector. Conversely, phantom power, which is not a necessary for lower end amplifiers, is often provided with the High End versions, so that musicians can use condenser microphones.
Vacuum Tube Guitar amplifier circuit is rather uncomplicated. Two triodes are used in the preamplifier section for obtaining a high signal level to implement any tone controls and drive the following sections. Two more triodes split the phase of the signal and drive the final pentode or beam tetrode (kinkless tetrodes) tubes of the push pull power amplifier stage.
Solid State guitar amplifiers commonly have the quickest response time, even more so than modeling amps. Tubes tend to create warm overdrive sounds instead of cutting the peaked signal off. They more or less pull the peaked audio information back (like natural compression) which creates a fuzzy overdrive sound.
Modeling guitar amplifiers are used to simulate sounds of well known cabinets, guitar amps, and effects. Digital processing is done to obtain this, although there are prevalence analog modeling amps as well, like the Tech 21 Sansamp. Modeling amps characteristically output a wide range of tones and effects, and offers cabinet simulation, which aids the recording without a microphone.
About the Author
Victor Epand is an expert consultant for guitars, drums, and synthesizers. You can find the best marketplace for guitars, drums, and synthesizers at these 3 sites: guitars, guitar amplifiers, drums, drum sets, drum kits, and synthesizers, keyboards.
What is the current situation in the field of Electronic Vacuum tubes of the good old days?
The diodes, tirode, tetrode, pentode, TWT, magnetron, klystron, Dynatron, and so on … What are you doing now? Are they still in use, or gone into oblivion? It's just my curiosity about his fate. Can someone not giving me any information about your current situation? Or any links to websites?
I seem to have reached that moment in life when things that I know and love best have become relics of the then "good old days"! Lamps devices are still in use. Tubes as triodes, tetrodes and pentode are useful when we need high power. If you need to generate 10 megawatts kWatts or transmitters then radio thermionic devices are the way forward. TWTs are still in use as broadband amplifiers used in satellite transponders, stations satellite earth and some radar applications. Magnetrons, of course, are the source of energy in microwave ovens. That generate high power with reasonable efficiency and may be pulsed to control the output power. Frequency stability is not a problem in the ovens. The klystron is in wide use of a high power amplifier. Has applications in TV transmitters and some radar transmitters. Its use in satellite ground stations has been replaced by TWTs. only recall ever seeing a piece of equipment using a Dynatron. They were a bit like a version of a tunnel diode thermionic. I'm sure it was very noisy devices by today's standards and can not imagine they would be in use more.