Preamp Deal of the Century

Hi Paul. Congrats on your new Supratek. Regarding the 6922-ecc88 family of dual triodes, the nos Euro tubes are generally the better sounding tube choices for most any high resolution high gain phono stage. The Amperex 7308, the Telefunken, Siemens and Valvo e88cc's are the usual choices.... not to mention the fabulous cca's from both siemens and telefunken. The 6688 is a very high quality low noise pentode that was traditionally used in wide band rf amplifiers. Any 6688 or E180f that comes in the Supratek preamps will most certainly be a nos tube anyway, as that tube has been long out of production. You can be certain Mick has screened, tested and culled them for all his customers..... I rather doubt you could improve on them anyway. Enjoy the ride!

Hi Clipsal. Congrats on the new Dual Cab. I am green with envy! The whole concept and circuit design of the new dual cab is truly brilliant IMO. While I am not familiar with the wiring arangement or the crossover interface of the Osbourn speaker system however.... I believe it would be advantageous for you to employ the 101D section of the supratek to operate at the 125 hz crossover point, whereby the 6H30 section of the preamp would handle the bass driver and sub system below that point. Is the Osborn sub modual self powered? You certainly will have a lot of hook up and/or wiring options open to you for configuring your system.... particularly if you are ever contemplating biamping at some point. Please keep me imformed as I am seriously contemplating a Supratek dual for my main rig. All the best on your endevour!....david

Hi Gang. Hey...Kudos to Ait for his post on the 7193 conversion. Well thought out and very well written.

Kgturner. While the conversion is certainly do-able.... I rather doubt you would reap much of a benefit[if any] from this conversion anyway. The job of the 6sn7 in the circuit of your Dual was chosen for a very different role.
That said: And trust me here KG [as this is a simple a no-brainer move] Swap out the 6sn7's in your Dual for a pair of old stock Kenrad VT-231's [the black glass versions] The quality of bass reproduction from the Kenrad is simply majestic, and unmatched by any other tube in the 6sn7 family.