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Linear Amplifier
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 Aftermarket Linear 720 Watt Amp Amplifier UL4400D LKQ  US $67.95
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 Linear Power Model 901 Stereo Power Amplifier 90 Watts RMS "OLD SCHOOL & RARE" US $175.00
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Onkyo DXC390 6 Disc CD Player List Price: $219.00 Sale Price: Too low to display  |
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Music lovers rejoice! Those looking for the ultimate in CD playback from an audiophile-grade component will be impressed with a high-precision, multi-bit D/A converter and 128 x oversampling. Others looking for convenience will thrill at the sight of 6-disc capability, 6 repeat modes, 40 track programming-and no worries about interruptions to your music, with the ability to change 5 discs while the last one is still playing... |
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Digital Audio To Analog Audio Converter List Price: $89.99 Sale Price: Too low to display |
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This handy Digital To Analog Audio converter box takes your coaxial/optical (S/PDIF or TOSLink) digital audio source and converts it to standard analog left/right audio, for connection to an external device such as an amplifier or recording deck via standard RCA-style jacks... |
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Yamaha YST-SW216BL Subwoofer List Price: $149.95 Sale Price: $111.45 |
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Yamaha YST-SW216 Subwoofer features Advanced Yamaha Active Servo Technology (Advanced YST) which is a unique system in which the speaker and amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion... |
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Pioneer TS-W2502D2 10 In. Champion Series PRO Subwoofer with 3000 Watts List Price: $230.00 Sale Price: Too low to display |
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~Pioneer's TS-W2502D2 subwoofers are designed to produce powerful bass. Just take a look at the super-heavy-duty construction, designed to handle up to 3,000 watts max. Double-stacked magnets deliver higher power, and a step-up radial surround offers superior control and long excursions... |
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Pioneer TS-W2502D4 10 In. Champion Series PRO Subwoofer with 3000 Watts List Price: $230.00 Sale Price: $106.50 |
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~Pioneer's TS-W2502D4 subwoofers are designed to produce powerful bass. Just take a look at the super-heavy-duty construction, designed to handle up to 3,000 watts max. Double-stacked magnets deliver higher power, and a step-up radial surround offers superior control and long excursions... |
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Rockford Fosgate R2D4-10 Prime R2 DVC 4 Ohm 10-Inch 250 Watts RMS 500 Watts Peak Subwoofer List Price: $94.99 Sale Price: $56.94 |
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**12 AWG compression terminals **Anodized aluminum voice coil former **Integrated PVC trim ring **Linear spider with embedded 16 AWG tinsel leads **Mica injected polypropylene cone **Optimized for both sealed and vented enclosures **StampCast basket with integrated spider venting |
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Pyramid PS3KX 3-Amp 12-Volt Power Supply List Price: $79.99 Sale Price: $33.00 |
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Amp power supply, perfect for home, shop and hobbyist. |
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Channel Plus DA-520A 20 dB Bidirectional Cable Amplifier List Price: $96.80 Sale Price: $54.99 |
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1 CATV OR BROADCAST ANTENNA INPUTOUTPUTS TO TV LOCATIONS1 OUTPUTBANDWIDTH: FULL CATV SPECTRUM 40 MHZ 1 GHZ PLUS RETURN PATH OF 5 MHZ 42 MHZ20 DB FORWARD GAIN PLUS 0 DB OF RETURN PATH GAINUPC : 782644007422Shipping Dimensions : 8... |
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Channel Plus DA-500A 18 dB RF Amplifier List Price: $82.40 Sale Price: $34.98 |
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1 CATV OR BROADCAST ANTENNA INPUTOUTPUTS TO TV LOCATIONS1 OUTPUTBANDWIDTH: FULL RF SPECTRUM 40 MHZ 1 GHZ18 DB FORWARD GAINUPC : 782644007569Shipping Dimensions : 12.50in X 7.00in X 3.00inEstimated Shipping Weight : 2... |
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Schaum's Outline of Electronic Devices and Circuits, Second Edition List Price: $21.00 Sale Price: $10.01 |
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This updated version of its internationally popular predecessor provides and introductory problem-solved text for understanding fundamental concepts of electronic devices, their design, and their circuitry... |
Here are some more information for Linear Amplifier:
A speaker system is made of a lot of small and big components, and each of them is equally critical in their own right. The audio amplifier is one of the most critical components of a sound system or a speaker unit, because it performs the major function of sound amplification. These amplifiers simply receive low frequency signals (In the range of 20 Hertz to 20,000 Hertz) and convert them to high frequency signals.
Basically, these amplifiers do the conceptually simple task of converting an input signal of few hundred megawatts to a signal of thousands of megawatts.
Technically, these amplifiers are designed on the metrics of frequency response, gain response, noise and distortion. The gain factor is probably the most important factor amongst all of them. Increase the gain factor slightly and the noise and the distortion levels in the amplifiers could increase significantly. On the other hand, reducing the feedback ensures that the gain and the distortion levels also come down. All of this is accomplished in AB Class Amplifiers, a class of linear amplifiers.
The first audio amplifier was invented in 1909, by Lee DeForest. The first amplifier used a triode vacuum amplifier which further resulted in the inception of the AM Radio. The induction of new age audio devices like CD and DVD players has resulted in the elimination of pre-amplification, a stage that was necessary for amplification of audio signals in the olden days. This is because of the fact that the CD and the DVD players produce a flat signal.
TIM, also known as Transitory Intermodulation Distortion, was found to be a problem associated with the working of the audio amplifier. High quality modern day amplification systems work on an open loop response frequency of 20 KHZ. This eliminates the probability of having TIM effect in the amplifier. That being said, some inferior quality speakers and amplifiers still have traces of the TIM effect.
The outcome of an audio amplifier is a high frequency sound signal, much different from the low frequency sound signal provided to the amplifier unit as input. There is a lot of complex circuitry involved with the amplifier itself and not to mention, the science behind making the amplifier work. Telecommunication engineers around the world must be commended though for the work they have done and are doing in this space to present a noise free and a distortion free amplification unit.
Kelly Hunter owns and operates http://www.home-stereo-speakers.com and also writes about Home Stereo Speakers
RF Optical Module for WCDMA Optical Repeater
GAO Tek Inc. has rolled out an optical repeater module designed for WCDMA networks. The RF module is used to monitor and control optical output power, LD bias current, received optical power, input and output RF signal power of Master, received FSK signal power and RF Gain control through the MCU. It is also used for RoHS compliant products.
The optical module for the repeater includes a linear analog PD with high sensitivity and a high power DFB laser, a low noise, linear RF amplifier, as well as built-in Bi-Di components and FSK monitor. 9.6 and 19.2kbit/s data rates are provided for selection. In the slave, a laser with a wavelength of 1.5µm is selected as transmitter and an analog PD as optical signal receiver.
About GAO Tek Inc.
GAO Tek Inc. is a leading provider of test and measurement equipment, embedded development tools, telecommunication testers, electronic measurement instruments, video surveillance, alarm and other electronic products that serve the needs of electronic professionals internationally.
The optical module for the repeater includes a linear analog PD with high sensitivity and a high power DFB laser, a low noise, linear RF amplifier, as well as built-in Bi-Di components and FSK monitor. 9.6 and 19.2kbit/s data rates are provided for selection. In the slave, a laser with a wavelength of 1.5µm is selected as transmitter and an analog PD as optical signal receiver.
The optical module for the repeater includes a linear analog PD with high sensitivity and a high power DFB laser, a low noise, linear RF amplifier, as well as built-in Bi-Di components and FSK monitor. 9.6 and 19.2kbit/s data rates are provided for selection. In the slave, a laser with a wavelength of 1.5µm is selected as transmitter and an analog PD as optical signal receiver.
About the Author
About GAO Tek Inc.
GAO Tek Inc. is a leading provider of test and measurement equipment, embedded development tools, telecommunication testers, electronic measurement instruments, video surveillance, alarm and other electronic products that serve the needs of electronic professionals internationally.
How do I test a 4-400 linear amplifier tube??
I have a Johnson Viking Thunderbolt linear amplifier. Recently the bias transformer blew up. I replaced the transformer , but now screen bias voltage and grid voltages are below normal.
When I remove the 4-400 bias voltages get back to normal.
The tubes I'm using now are new Eimac Jan 8438 . But the problem happens also with old Amperex 8438. The voltage regulators VR-150 and VR-105 are new units.The rectifiers were tested and found ok. Is there a way to rest my 4-400 tubes without substituting them (I dont have extra tubes) ?if you need more info on this question to give a precise answer let me know.
Unfortunately the only way to truly test a transmitter tube is while transmitting. If the same thing happens with 2 different tube, I would suspect it is not the tube(s). I would recommend you post the question on the Elmers Forum of eham.net and see if anyone there can help you out. Good luck.
Noted DXer Vince Thompson, K5VT (SK)
Dr Vinson Thompson, K5VT, passed away on April 26 from acute myeloid leukemia, only diagnosed four weeks before his death. He was 67. An ARRL Life Member and former Chairman of the ARRL DX Advisory Committee (DXAC), Thompson was famous in DX and contesting circles and held radio licenses from more than 60 countries . One of the founding members of the VooDoo Contest Group, he traveled extensivel ...
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