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Rectifier Tubes 
274A / 274B Mesh $315
5Z3 Mesh $315
5U4G Mesh $315
80 Mesh $315
AZ4 Mesh $363
81 half wave $315

(see notes below regarding rectifier usage)

Driver Tubes
 20A / 20B $603
30A
$630
 20A mesh  $689

8

Output Tubes

 45 $625
 
1 45B $649
45-Mesh $728
1  45-Mesh Globe $949
 50 $860
2A3-S $657
2A3-Mesh $728
300B $662
1  300B/2.5 $657
1 PX4 Mesh - $938
 300B Mesh - $938
300B-XLS $889
320B-XLS $895
AD1-mesh  $978
520-V2  $1175
520- V3 $1149
1605  - $1254
     Tube base glue for repairs


2 About filament quality
Specific items with some amplifiers

WARNING FOR FAKE
MESH TUBES
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  CHECK OUT OUR NEW FORUM AT THE LINK BELOW

                        FORUM
All tubes priced per matched pair.
Rectifiers priced each.
Prices are subject to change due to currency exchange rates.


Tube Base Glue to repair loose tube bases.
$32.00 per bottle

To order: info@tubesusa.com
or call (516) 902-3334






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.