Tube rolling in the new 10 Octave LP-1 preamplifier!

[fxbill 456]

There are adapters available to allow extensive tube rolling the the new preamplifier. They're available on Fleabay for a nominal cost.

 These adapters can be used to roll 12AX7's in place of the 6N2's and/or to use12AU7's in place of the 6N1 tube. Our preamp case height was specifically designed to allow room to use these adapters without any height restrictions placed on them. Also...in most cases the 6DJ8 can be used as a sub for the 6N1 directly although the gain is slightly different.  In these cases with the 6DJ8 or 12AX7's and 12AU7's ( with adapters ), it's all subjective as is the case with all tube rolling. To each his own although we have tried many combinations with excellent tubes and brands and have both felt that the "EV' or "EB" series 6N1's and 6N2's have a better sound than anything else we've tried....and the prices on these is far less than on most other tubes since they can be purchased from Russian surplus dealers. Just make sure that you insist on the "EB" or "EV" suffix to the tube. They are the extended life...( greater than 5000 hours and greater than 10,000 hours in some cases ) and the ultra low floor noise level and low microphonic models. They are extremely quiet with exceptional tonal qualities. The "OTK" printed on the tube signifies the quality control "stamp of approval" signifying that they were approved for military use and are of the highest build quality and specifications. Silver plated anodes and triple mica units are the most desirable, but also a bit more costly and harder to find. ( When I say more costly...they are still far below the price of any quality 12AX7 you can purchase...less than $10 per tube in most cases and as low as $5 per tube in some cases. )

Edited March 4, 2019 by fxbill