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 |
| 6CA7.001 | 6CA7 Fat Bottle by US manufacturers | $100.00 |
| 6CA7.004 | 6CA7/EL34 Vintage Japanese tubes | $40.00 |
| 6CA7.005 | 6CA7/EL34 Mullard "B" code XF2, XF3, XF4 | $150.00 |
| 6CA7.008 | 6CA7/EL34 Svetlana from St. Petersburg | $50.00 |
| 6CA7.009 | 6CA7/EL34 SED (winged "C") tubes from St. Petersburg Russia | $50.00 |
| 6CA7.010 | 6CA7/EL34 Electro Harmonics | $20.00 |
| 6CA7.012 | 6CA7/EL34 RFT | $75.00 |
| 6CA7.013 | 6CA7/EL34 Metal base | $300.00 |
| 6CA7.015 | 6CA7/EL34 Mazda L code | $125.00 |
| 6CA7.016 | 6CA7/EL34 JJ | $15.00 |
| 6CA7.017 | 6CA7/EL34 Chinese | $10.00 |
| 6CA7.018 | 6CA7/EL34 Sovtek | $10.00 |
| 6CA7.019 | 6CA7/EL34 Telefunken | $200.00 |
| KT77.001 | KT77.001 International Servicemaster | $15.00 |