The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it’s ink-stamped or paint-stamped on the “bell housing” of the speaker. In either case, the code works the same. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code. The remaining 3 or 4 digits are the date code. In 3 digit dates code, the 1st digit is the last digit of the year. On 4 digits date codes, the 1st and 2nd digits are the last two digits of the year. In either case, the remaining 2 digits are the week of manufacture 01 to With this in mind, remember if the last two digits of the source-date code are greater than 52, you’re not looking at the source-date code! Also it’s worth mentioning:
Download This page contains information about installing the latest Midiman driver downloads using the Midiman. Midiman oxygen 8 driver vista then launch the mac. On HAX tech forever.
Sep 24, · However, big bass will require a sub for certain and there was a good reason Urei put one in with another 15″ woofer. Speaker size starts to get really big then. All engineering is compromise and the Altec Duplex is no exception to that rule. There is no perfect speaker.
Both woofers were sourced to be the correct AlNiCo magnet versions, with the ‘damping ring’ as the original pair had too many issues we repeatedly found with our AF Gen Sweep processes. The original surrounds on AR-3a woofers were typically ‘distorted’, so we sent these to our local, ‘been in business 40 years’ speaker shop for fresh surrounds. The ‘spiders’ were also slightly ‘deformed’ we didn’t notice this as it is a rare condition on most speakers, was hard to see, but would show up at 3 different frequencies on an AF generator sweep, but most noticeable centered at 80Hz , so he ‘painstakingly’ replaced them, while retaining the original VC’s and Cones retaining the original Voice Coils and Cones made the process logarithmically more difficult.
We have completely tested all drivers. All drivers were removed and tested individually. Attenuators removed and ‘burnished’ for ‘intermittent-free’ performance. Felt feet were installed to the bottom plates. Cosmetically, the grills were cleaned, and the original ‘hot glue attachment’ replaced with Velcro. We also added a ‘pull tab’ to facilitate removal. Grill frames intact with NO cracks or breaks.
Our tech was able to make the ‘real wood’ Walnut veneer cabinets ‘presentable’ and they just had a fresh coat of ‘Restore-a-Finish’, then ‘Feed-n-Wax’, then buffed. See above photos for details of cosmetic issues.
UDPATED (4): Presto Recording Corp: Pioneers of ‘Instant’ Analog Disc Recording
The following description applies to most cassette and open reel tape transports including those used in portable and microcassette recorders, Walkmen, and telephone answering machines. Looking at the top of the deck such that the tape heads are at the bottom: Supply reel table – left hand side platform on which the supply tape reel sits.
Edge which contacts idler tire if used should be cleaned. Takeup reel table – right hand side platform on which the takeup tape reel sits.
Altec Lansing Octiv Mini M The Altec Lansing Octiv Mini is an ideal option for anyone seeking an affordable, minimalist iPhone speaker for the bedroom, bathroom, or kitchen.
Guitar Player December Letters to the editor; Guitaring; Questions; It’s New. VG condition, mailing label on back. VG condition, mail label back cover.. A Pro replies; Rusty Young: Steel symposium; Chuck Rainey: More sonic shapes; Bob Baxter: Constructing chords; Jerry Hahn: Rhythm changes; Jimmy Stewart: Transcribing from LP’s; Happy Traum: Steel symposium; Jerry Hahn: Progressive blues; Bob Baxter:
UDPATED (4): Presto Recording Corp: Pioneers of ‘Instant’ Analog Disc Recording
It is beautiful listed as B1 looks perfect to me. Thanks for an excellent buying experience. MN Hey I wanted to take a moment to thank everyone involved for this great deck. So thanks again and keep up the good work. OR Thanks for your hospitality. Audio Classics is a great place to visit recommended for kids of all ages R.
A Fresh Look at Hifi Loudspeakers & Matching Includes a selected listing of Loudspeakers from the Hifi Yearbooks. We’ve never read a page like this one we’ve written, you might find details hidden in dry theory books, but here is the deal on Speakers so it finally makes just a little bit more sense.
Return to the Main Index. Sometimes there just isn’t enough information on electric instruments and amps to allow them to be properely dated. And many people ask me to try and determine the year of their old amplifier, or to help them with the year of their older off-brand electric guitar. Since I primarily collect amps by Fender, and guitars by Gibson, Fender, Martin, National, Epiphone, Gretsch and Rickenbacker, I really can’t help them with these other less popular brands.
As you have probably noticed, there is plenty of information here to help date the brands that I am interested in. But where does that leave everyone else? Well I’m not one to leave you out in the informational cold, so here’s something that I use quite often in dating amplifiers and electric guitars.
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Used in multi-driver speaker systems , the crossover is an assembly of filters that separate the input signal into different frequency ranges i. Hence the drivers receive power only at their operating frequency the sound frequency range they were designed for , thereby reducing distortion in the drivers and interference between them.
The ideal characteristics of a crossover may include perfect out-of-band attenuation at the output of each filter, no amplitude variation “ripple” within each passband, no phase delay between overlapping frequency bands, to name just a few. Crossovers can be passive or active. A passive crossover is an electronic circuit that uses a combination of one or more resistors , inductors, or non-polar capacitors.
(Click here for bottom) J SI-approved standard symbol and abbreviation for the SI-approved energy unit — joule.A joule is inch-pounds, in universal American units. In the boring system, a joule is a newton meter. In terms of the earlier boring system, a joule would have been 10 7 erg. Because metric units ignored Thomas Jefferson’s (and others’) wise suggestion and were not selected to.
About the size of a Fender Twin, it has the classic tweed look of late s Gibson amplifiers. The only effect that the amp features is tremolo, but this is to be expected since the design predates the age of combo amps with on-board reverb The Gibson catalog claims true vibrato pitch modulation for this amp, but after listening to the true vibrato Magnatone amps, the Gibson sounds like it has tremolo volume modulation very similar to that used on brown Tolex Fenders i. They play an important role in the unique sound of this amp which we’ll get to in a moment.
First, let’s go over the tube compliment. Every true stereo amp has two separate power amps. As such, they have more tubes, an additional output transformer, and sometimes an extra power supply compared to a standard mono amp. These tubes are readily available and not too expensive. The amp is good for about 17 watts per side stereo or 35 watts mono. The controls are smartly laid out.
I’ve seen a number of books that begin with one definition. At least it didn’t involve turning lots of pages. Evidently, influir is in there because it occurs in the definition of influjo. The back cover blurbiage includes the following statement: Isn’t it only the back leg? Mother very thoughtfully made a jam sandwich under no protest.
JBL makes a wide range of speakers and subwoofers both under the JBL name and also under the Altec Lansing and Harman Kardon names. Per manufacturing regulations, the makers of electronics must include a minimum amount of production date information on their products.
Above, the Presto Model A, their top-of-the-line system circa There is a detailed history of the Presto Corp provided at this website, so no need to re-tread those waters. Basically, what Presto offered was a way to make good-sounding LP and 78 recordings that could be played back instantly on any home turntable. Unlike earlier commercial recording technologies, there was no intermediate submaster required. Presto was able to do this by having designed an aluminum later, glass disc that was coated with a special cellulose-based compound featuring 51 ingredients!
At right, the Presto A Electronics package. This was a complete system of microphone preamps, cutting amps, patchbay, and AM radio tuner that was designed to accompany the Model-A pictured above. On a more basic user-level: Nowadays almost all audio control happens electronically; once the room is treated and the microphone carefully placed, our work as recording engineers leaves the realm of physical manipulation and enters a world of electronic control.
Above, the Presto A microphone pre-amplifier, the one piece of equipment in this lengthy catalog that could still be of potential use to modern recordists. Thank-you to reader EL for sending us the schem to the Presto A. This must be a slightly later version of the A, as the 2nd tube is a 6SJ7, which is a variant of the 6J7 that has the input grid connection in the base rather than on the top. Other things to note:
Not open for further replies. Massachussetts Hi folks, I’ve had these speakers since I purchased them new in I had cabinets made according to plans that I got at the time and I’ve been really happy with them ever since. One thing I could never determine is exactly what the crossover does. Here’s a photo not mine but just like mine: Now I think what it does is it takes the full signal coming in and it divides the low frequencies to the woofer and the high frequencies to the horn tweeter.
GAS Stereo-Vib (tweed): 2x18W 4×8″ and 1×12″ Guitar Combo with Stereo Vibrato Speakers: 4×8″ & 1×12″ (Jensens) Inputs: 2 stereo, 2 mono Channels: 2 Volume Controls: 2.
This information original was found on The Unofficial Ampeg Page http: I pulled this information from Google’s cache of the site. It has a note at the top of the page that they were reprinting with permission from the authors of Ampeg: If anyone feels this page should be taken down, please feel free to contact me. Ampegs can be divided into six distinct groups for dating purposes: Each group uses a unique serialization scheme that can be used to assist in dating the amps, but in many cases, it is the features and characteristics of the amps that determine the year of manufacture.
Electronic Industries Association EIA codes can also be very useful for giving clues as to an amp’s age. These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic “can” caps. Of course, these codes are only applicable to original components, not replacement parts. Ampeg amplifiers, especially the high-powered amps such as the SVT and V-series, contain lethal voltages even when unplugged and turned off.
Therefore, do not poke around in your old Ampeg if you are unfamiliar with amplifier electronics or their operation. A brief summary of the EIA system follows. Shortly after World War II, American electronic component manufacturers began to stamp a semi-standardized code into the parts they produced.
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This review page is supported in part by the sponsor whose ad is displayed above Owner: Metronome CD2V signature, Ack! James Burgess 45 Speakers:
A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound. The most widely used type of speaker in the s is the dynamic speaker, invented in by Edward W. Kellogg and Chester W. dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound.
The AR was in use as early as , mainly in commercial shipboard radio rooms. The receiver circuit uses one RF amplifier, a regenerative detector and two stages of AF amplification. Tuning is from 15 KC to KC in four bands. The Preselector was used to reduce regenerative signal radiation to the antenna in addition to increasing sensitivity and selectivity. The National Type “N” dials are scaled with deg. The RAZ-1 could be operated from batteries if necessary.