Misc. preamp tubes (6AV6, 6BL8, 6U8... ) Tubes selected and tested for audio applications.
| Order No. | Tube description | Price each |
| 6AU6.001 | 6AU6 Vintage American manufactured tubes from RCA, GE, Sylvania. | $5.00 |
| 6AV6.001 | 6AV6 Mullard 10M series | $20.00 |
6CG7/6FQ7 Tubes
| 6CG7.001 | 6CG7/6FQ7 G.E. tube | $28.00 |
| 6CG7.002 | 6CG7/6FQ7 RCA top getter grey plate | $30.00 |
| 6CG7.003 | 6CG7/6FQ7 RCA side getter with clear top | $40.00 |
| 6CG7.004 | 6CG7/6FQ7 Sylvania tubes from the 50's and 60's | $25.00 |
| 6CG7.005 | 6CG7/6FQ7 Raytheon US manufacture tubes | $40.00 |
| 6CG7.006 | 6CG7/6FQ7 RCA top getter black plate | $30.00 |
| 6CG7.007 | 6CG7/6FQ7 Misc US manufacturers | $20.00 |
| 6CG7.008 | 6CG7/6FQ7 European or Japanese | $40.00 |
| 6C4.001 | 6C4 Select US manufacture tubes | $8.00 |
6F8G Tubes
| 6F8G.001 | 6F8G Tungsol vintage round plate | $40.00 |
| 6F8G.002 | 6F8G Misc USA manufacture tubes | $20.00 |
6U8 NOS tubes
| 6U8.001 | 6U8 Tungsram tubes manufactured in Hungary | $9.00 |
| 6U8.002 | 6U8 Vintage U.S. manufacture tubes | $10.00 |
| 6U8.003 | 6U8 Japanese | $7.00 |