Are there any $1500 tube preamps that that can compare with Tubes4hifi's SP14?

I believe that the Don Sachs and the Linear Tube Audio ZOTL preamplifiers would be a very interesting comparison. Both use the revered octal 6SN7  as opposed to the smaller 9 pin signal tubes.
Charles

As with Deepee, I have had the caps upgraded for a modest cost and the sonic improvement was exactly as Don portended.  His latest improvement is to employ the very fine Dueland wire for the internal wiring.  I have a a stock SP-14 in my bedroom system which is very good, but by comparison, Don's preamp profoundly better.  Don is now a devotee of the Shuguang CV181 tubes and I agree 100%....they are far better than any NOS tube out there other than a few of the Holy Grail of uber expensive tubes.  

Don upgraded my HK C-I, C-II, and C-V and they were outstanding.  However, his preamp is a much much better than the C-I and I am quite sure his new KT88-based amp will be much better than the C-II.  Google "Don Sachs Consulting" for a link to his website.  There may be better preamps available, but only if you are willing to spend dramatically more money.    

Hi , I have the Rogue RP-1. I spent $250 on 1 pair of Telefunken Tecktronix 12au7's after spending $130, on a pair and JAN RCA tripple mica blackplates and $100 on a Silnote cord . I haven't tried the phono stage , and the headphone stage is not tube driven and is a little lacking . So you pay $1600 for a nine pin setup and have to replace the $25 a pair JJ's. I'm cosidering Dons amp and a pair of Bob Latino 125's. But I think I'll be at about $2500 with upgrades with Bob.  Happy Listening . PS, I'm MID FI AND HAPPY 😊 

Another shout out for Don Sachs.

I have had the absolute enjoyment of his SP-14 Model 2 for about 6 months now.
Yes, as all have mentioned Don is a stand up guy to deal with. Even more important though is that he is a master at selecting just the right parts to make this great design really sing.

I am running the Bob Latino ST 120 amp which I love. That said Don's amp looks to be even more of the same has been on my mind.

I haven't heard any $1500 tube preamp that can compare with a "tweaked" Tubes4hifi's SP14. By "tweaked" I mean put some better parts in it - Duelund/Jupiter/V-Cap output caps, good quality resistors in the signal path, better components for the PS, good attenuator, Shuguang CV181 tubes, etc. The price would go up from $1500, but you would have a preamp that can easily compare with a lot more expensive preamps. If you are into DIY you can buy the kit from Tubes4hifi and upgrade components yourself. Otherwise you can go to Don and get his version.