Hi Ronald uTracer works well!! I use it mainly to pairing tubes Hello Ronald, I finally completed the unit. The top has the switches, banana test points, tube sockets, and fan. All of the connections between the top and bottom are plugs so the top can be totally removed from the bottom for constructions and maintenance if needed. I tried to keep all the wiring, switch plates, banana plugs colour coded to help with the construction. Soldering the switches and sockets was tedious Regards, Eric 26th of January , Davide from Italy sent me an extensive photo documentation of the construction of his amazing uTracer! The electronic part, thanks to your perfect kit, has been assembled and tested in just a few days.
The Marketplace for Musicians
I will also detail long vs. I will also get into tube dampers, and how these dampers can greatly improve tube sound and performance in guitar and audio applications. I will also briefly discuss the real meaning of a ‘ NOS ‘ tube, tube faking, and overcharging for tubes by some dealers. European ECC83s are generally sought after for their warm sound with exceptions — Telefunken, for example.
Nov 23, · ID is the tube type. 3 is the change code or version so, yes, 3 is earlier than 4. When enough changes had been made to the tube to consider it a new version the change code was moved up. I think the Heerlen (delta) plant made tubes from the mid 50s to the mid 70s.
Quantity In Stock — Quantity in Stock new listing categories: Please call us for the latest inventory, and we can often outsource these tubes for you. New Old Stock White Box. Great blackplate Sylvania and Westinghouse GTB tubes screened for demanding use in electronic organs. All have passed the Baldwin factory test for audio use!
This is the famous black plate s s version 6SN7 and is in great demand today. Medium glass envelope, marked with the Sylvania green label, the Baldwin label, or the Westinghouse label, but all came from Baldwin. Organ tubes are especially fine sounding in audio equipment, and we have carefully matched these into pairs and also have singles available. Of particular interest was the Baldwin Organ 6SN7 which to my ears in both a B and 45 SE was as clean as others costing many times more.
Dating an (old) Phillips tube (ECC83 / 12AX7)
In my system the only tubes of merit broke out something like this: Mullard CV box plate That’s it. The rest, amazingly enough, weren’t worth the waste of time in my rig – but the risk of course is that one of those might ideally match your rig, ’cause with tubes you never know what’s going to lock-in in any given system.
Amperex Electronic Corporation was a manufacturer of vacuum tubes and semiconductors. Originally located in Brooklyn, New York, Amperex was a long-established manufacturer of transmitting tubes when they were acquired by the Dutch firm, Philips in
This list is circa , and some codes have been reassigned or added since that time. Code formats were not completely standardized, but a little deciphering will generally yield the info of interest. Note that many makers also stamped OEM Original Eqipment Manufacturer part numbers above or below the EIA code, in some cases parts makers or the customer elected not to include the EIA codes, so not all parts have them. They generally follow the following format: One alternate scheme is: Usually single digit date codes are from the ‘s, but have on occasion shown up in later decades, even up to the ‘s.
If one has a general idea of the age of the piece in question, usually the decade can be divined from that. Another alternate is in the format following: And another is like this: KE The reason was purportedly to allow factories to track the dates of manufacture of defective tubes especially important in the case of OEM customers that might send back entire batches of tubes , but avoid possible consumer complaints about “stale” tubes.
This sounds perhaps a little silly since the shelf life of tubes is decades, at least indefinite in practical terms , but some OEM’s might have beenn a bit irritated by occasional consumer complaints such as “my model TV has model tubes in it!
They also ended up being produced in Canada, as well, but unfortunately the production of these tubes stopped in the mid ‘s. PhilipsECG was apparently the holding company for Sylvania at the time production was ceased. Sylvania purchased companies such as GTE in the 70’s that allowed them to stay financially strong.
New and used Amperex Usn Cep 6dj8 Vacuum Tube Match Pair Holy Grail Best One Ever up for sale. Buy and sell Amperex Usn Cep 6dj8 Vacuum Tube Match Pair Holy Grail Best One Ever on FindTarget Auctions online auction site.
This is on my bed-room, where I used to listen to music. So I’m trying to find a preamp I can see many many solid state preamp, but I’d like to change my style in listening I’d love slow, soft music. That is the reason I want to try a tube preamp. In my country Vietnam , there are some workshops where they produce preamp with this shematic.
I know the original AudioNote M2 is very very expensive and had a lot of good reviews also. So, please tell me what the difference between 6SN7 and is!!! Thank you so much! My English audio words is very bad! Tungh, don’t worry, your English is good enough. Here is a reference that offers descriptions of various types of tubes including the 6SN7 and the ; check the ‘Preamp’ drop-down I can’t tell you which is better: A little more info can be found for each at these links
12AX7 / ECC83/ 12AT7 / ECC81 / 12AU7 / ECC82 / / / 6DJ8 / /
Cherry Hill, NJ It is cocknbull. Maybe a modern amp designer tweaks a bit to get as good a tone as possible with current tubes. Providing you choose the right NOS and it is strong. Even when subbing in one of those “optimized” amps. I have spent thousands on nice testing gear and tons of tubes both old and new. Recorded hundreds of samples.
Jun 17, · The EL84 draws about 50 percent more filament power than a 6V6 and the elements are packed together much more tightly. The design goal is to boil off and control as many electrons as a 6V6, but with a smaller plate.
If you are fortunate enough to have some Telefunken tubes with labels that are intact, here is an explanation of how to determine when they were made. Three letter, two digit date codes From to , Telefunken used a 2-letter code to identify the date of production. Scroll down to see the chart of two letter date codes. Two digit date codes Tubes that Telefunken manufactured for export have only the two-letter date code without the factory and internal codes.
The letter code can appear in either upper or lower case. Scroll down to see the chart of each two letter date codes. Two letter, seven digit date codes, — In , Telefunken began to use a new, more complex code format composed of two letters and seven digits.
Amperex, Mullard, Philips, and Valvo Tube Codes MostAmperex, Mullard, Philips and Valvo tubes are marked with a group of symbols which contain coded information relating to the type, place of manufacture or country of origin, and the date of manufacture. Apart from the interest of knowing when and where a tube was made, the code group can still provide useful type identification when the commercial markings have become illegible. There were two types of code formats that used the same tube type codes, which were in use from until these companies stopped the manufacture of standard receiving tubes.
The code format changed about or There are some deviations to this rule, and in certain manufacturing plants not all of the code protocol was followed exactly, with every batch of tubes.
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Quantity In Stock — Quantity in Stock new listing categories: Please call us for the latest inventory, and we can often outsource these tubes for you. We can usually match tubes to within micro amps of plate current under full rated plate voltage. If you have a sensitive application for a pair of these tubes, matching on the curve tracer is recommended. Allow an extra day or so for this careful and accurate testing to be done.
Results provided on a special data label on the tube box. Sensitive noise test fixture testing services for any tube Special noise testing services can be provided for your tubes. If you have a highly sensitive application such as a phono or microphone preamp, additional testing on our specially designed class A noise test fixture is recommended.
electron Tube Data sheets
These deliver absolute heavenly bliss!!! This pair is from a treasure trove find of perfect examples still new in the box old stock tubes. These tubes have never been used. A near perfect pair with no wear or blemishes and they sound perfect tested by me.
Fender amp frequently asked questions. Code Manufacturer Part(s) Becker: Speakers: Eminence: Speakers: J.B. Lansing (JBL).
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. It’s called the “source-date code”, and it can help determine the approximate age of an electric instrument by the date its components were manufactured.
EL84 vs 6v6
Call Toll Free or email us: Originally located in Brooklyn, New York, Amperex was a long-established manufacturer of transmitting tubes when they were acquired by the Dutch firm, Philips in Philips used the Amperex name to distribute their new line of Dutch-made miniature tubes to feed the booming U. Amperex also produced frame grid tubes. Amperex also made the original “Bugle Boy” series with its ability to filter out noise due to the wire-mesh grid design.
Look for it near the bottom of the tube after the “Made in Western Germany” print, centered in the middle of the tube (usually uppercase listed in a column instead of side by side), or near the top of tube after the 12AX7 / ECC83 print. For example, for the tubes in the photo, “fr” = Dec. , “LH” = Dec. , and “pe” = Oct.
Unfortunately, they are clearly Russian-bred tubes. Gold-plated pins on a metal 6SJ7 made me buy this tube. The example above states the tube was manufactured in Canada, making it a possible Marconi product. A Royal Puzzle is more like it. Who knows anything about these tubes? A total mystery to me is the Regency tube line. So I cannot even speculate if these are rebrands.
I have a surprisingly modest number of Regency tubes, all Radio types. The above box holds a 6X5GT. This Siemens tube and a few others above left and center are a slightly different picture on each side of the same box. It appears to be older, and the single language box suggests it was not for export, but for domestic use only. Have you heard of any these tubes? More tubes I am unfamiliar with. You now know as much as I do about them.