FS: Sonic Frontiers SFL-1 Signature edition tube/SS linestage preamplifier using the . 12AT7/CV4024/ECC81 family of tubes. Please note this is a "Sig" and not the standard SFL-1 that typically sells for ~$500 on the used market. The signature upgrade alone will set you back >$1100 if you have it done by the Parts Connexion in Canada (service and upgrade company for SF products). The Sig is a major upgrade and uses top-grade film caps and Teflon insulated wiring everywhere. I have the original box, inserts, manual, PC, etc. I WOULD CONSIDER A LOCAL TRADE FOR OTHER GEAR. Thanks.