Emission Labs Tubes
|Why should you purchase Emission Labs vacuum tubes from TubesUSA? Because all of our tubes are tested in-house on our Amplitrex tester, and are then installed and tested in one of the amplifiers that we have on site. We have an amplifier for every tube that Emission Labs manufactures. This helps distinguish us from the others. We provide excellent customer service and we'll help you choose which tube is right for your amplifier. We don't offer an online store that has "Add to Cart" because we feel that buying tubes is a little more complicated than this, and this doesn't give the customer a lot of confidence with their buying experience. While we communicate via email, we're just as happy to have a conversation with you on the phone. We've represented EML in North America since 2005. So call or write to us with your questions and let us help in providing you with a great experience.|
(see notes below regarding rectifier usage)
20A / 20B $684
20A mesh $771
Output Tubes45 $715
45B* - $737 Special order only
45-Mesh Globe Call for Price and availability
2A3-Mesh Globe Call for Price and availability
300B/2.5 mesh $889
PX4 Mesh - $1034
300B Mesh - $1034
520- V3 $1267
1605 - $1383
* V4 series tubes by special order only
| Tube base glue for repairs
About filament quality
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Note 1) Good care should be taken when making the design of any DH rectifier. It must be prevented to have strong current peaks, through the first capacitor, because consequently this flows through the tube anode, and transformer windings as well. The transformer will produce mechanical hum by this, most specially if windings symmetry fails. Also the tube will suffer. For this reason, the first capacitor (C1) should never be larger than stated in the data sheet. The mechanical transformer hum, and also tube current peaks are greatly reduced by smaller capacitor values, and use higher choke values instead. Although higher capacitor values are at lower cost, using lower capacitors and higher chokes values instead, is always more satisfactory in the end. The result will be: Lower transformer hum, less electrical field radiation into the pre-amp, and more lifetime from the rectifier tube. This is why we recommend using largest chokes. From Lundahl, high value chokes are available at the same price as HiFi capacitors, like from a Mundorf or Black Gate. So we have to go back to the roots, and use high quality, large value chokes, like in the old days of radio design. For best ripple suppression, increase the choke to any value you need, or even use a C-L-C-L-C circuit, as also advised in the historical RCA data sheet.
Note 2) Higher capacitor values up to 20uF can be used, if you work at lower voltage and lower current than maximum. This will be the case for instance with smaller amplifiers, such as using the 45 tube.
Note 3) As a rule of thumb, high voltage power supplies are best built with large size chokes, especially at high output current, whereas low voltage power supplies can be built more easily with large capacitors.
Note 4) Winding symmetry is needed with HV transformers to prevent hum. A HV winding with center tap, requires FOUR separated HV windings inside the transformer, which are arranged for the end user as TWO windings which are in series. It is remarkable to see that this is widely unknown today by many transformer manufacturers. Also this is more expensive. So often, they build tube rectifier windings only from two internal windings, and not FOUR windings as needed for tube rectifiers. However we have a tube data sheet here, no transformer construction manual, so we can not explain this in more detail.