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.
Vintage Tube Boxes
They were on my initial list mostly because of Stone. However the consensus from my earlier research indicated that anything from Amperex would better them. But your comments made me look again and I did find one interesting comparison from AudioKarma.
I like Amperex, the Holland made tubes sound best to me, then the white PQ, Or Jan and Usn-Cep; they will be , and are all the same Amperex Tubes. They seem brighter to me than Mullard, yet they have a lush sound.
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.
1959 Magnatone Model 213 Troubadour Brown, Very Good, $1,199.00
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.
Jan 13, · Room/Tube: Stillpoints Apertures / Amperex + Mullard just in the power supply. Are the tubes hidden or is the audio circuit solid state? G. gian60 Well-Known Member. how’s your hair going? so far looks well pillowed to me! or is that an old photo dating back to fresh off the corporate ladder Good photo Gian, I would love to meet him.
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!
NOS Tubes for a new Vox AC15, worth the cash?
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
European ECC83/12AX7: ECC83 is the European designation for the 12AX7 tube — (it is the same exact tube). These tubes include those produced by Mullard, Amperex, Siemens, Telefunken, Tungsram, RFT, Ei, Mazda, Lorenz, Philips and others.
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:
Nick Dorazio . Speaker Repair
ECC88 is the European designation for this tube. Displaying products 1 – 27 of 27 results Show: Tube tests as new with balanced sections and phono grade noise levels. Both tubes test as new with phono grade sound quality. It has gray risers and a halo getter with wide support post.
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
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. Given that, the 3 tubes I identified as the winners do have fairly broad followings among audiophiles while most of the others do not, though a few do like the Mullard box plate.
When it comes to sonics general comments go something like this: RFTs – linear, clean but just a bit clinical and hard sounding. Good transparency and detail.
Dating an (old?) Phillips tube (ECC83 / 12AX7)
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.
Of course, the middle tube is the NOS Sylvania 6CA7, and the tube on the right is an NOS USA GE 6CA7. The 6L6GC is a little smaller in size, but the GE is larger. Notice the rectangular middle hole punch on the plate on the GE that I was talking about earlier.
Fri, Dec 30, Mon, Jul 06, Good tubes but not as valuable as the Brown base. I would be putting these in my Cameron modded Marshall Aldrich. Any idea how they compare to SED winged C? For new production imo the Winged C’s are my overall favorite. For guitar my first choice is the Mullard XF2 single getters, not the double which are great for hifi but too hifi for guitar.
My second choice is close between the old Tesla brown base and the Amperex. The black base Teslas I had were also very good. I would take any of these over the Winged C first. The german made RFT are also good tubes at lower plate voltages. I found them to fall apart somewhat under heavy power and volume. Its hard to find a seller who knows how to match them. All this tested close on my Eico, etc.
EL84 vs 6v6
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.
*Heerlen plant tubes were sold with different labels like Amperex, Miniwatt, Philips, Bugle Boy and also relabeled by various Philips associates or companies owned by Philips like Valvo, Mullard, La Radiotechnique RTC, Siemens, Adzam etc. Etched date codes tells the origin of the tube.
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. The letter formats were also used until , so you may see both. Please note that this chart differs from the Eric Barbour version because it includes corrections to duplicates and missing codes.
These corrections are based on the logic of the two letter sequence whenever possible the sequence was random in —43 and interrupted in — With the exceptions of some apparent confusion between and date codes, the corrected dates generally remain within the same year. Please contact me if you have any questions or further information about Telefunken date codes. One interesting thing about paying attention to the date codes on Telefunken tubes is the degree of consistency in their production.