I have two Futterman OTL3s with 10 tubes each.
I have a Beard P505 preamp. with 9 tubes.
I have been using them for 39 years.
I have a Pro-ject tube box D2 with 2 tubes. 39 days.
Jon Specter keeps them going. The Futtermans were dicey for the first 10 years, but since then, 14 years between servicing. Contact me via my website if you want to speak to him. He’s in NJ.
theaudioatticvinylsundays.com