The 6CA7 is the American variant of the EL34. Although the plate structure is different, these are electronically the same as the EL34. The bottle is larger on these tubes and they are generally considered to be the toughest of this type of tube. 6CA7's can be interchanged with the EL34. The KT77 is another variant of the EL34 and can be used in equipment calling for the EL34. Standard European EL34's are the tall thin bottle tubes. Russian EL34's of modern production are also of the tall thin bottle type.
| Order no. | Tube type and description | Price each |
| EL3.001 | 6CA7 Sylvania fat bottle | $125.00 |
| EL3.002 | 6CA7 RCA fat bottle | $125.00 |
| EL3.003 | 6CA7 G.E. fat bottle | $125.00 |
| EL3.004 | EL34 Vintage Japanese tubes | $40.00 |
| EL3.005 | EL34 Mullard "B" code XF2. May be labeled with American manufacturer names. | $200.00 |
| EL3.006 | EL34 Mullard "B" code XF4 tubes with various manufacture re-labeling | $150.00 |
| EL3.007 | EL34 Mullard "B" code used tubes | $50 - $80.00 |
| EL3.008 | EL34 Svetlana. Real Svetlana tubes form St. Petersburg Russia. | $38.00 |
| EL3.009 | EL34 SED (wingged "C") tubes from St. Petersburg Russia | $38.00 |
| EL3.010 | EL34 Electroharmonix. Russian construction tube. | $20.00 |
| EL3.011 | EL34 National Electronics | $65.00 |
| EL3.012 | EL34 Chinese tubes | $17.00 |
| EL3.013 | KT77 International Servicemaster. Russian construction | $20.00 |