@markusthenaimnut - you can email us at tubeaudiostore@gmail.com and provide us with the relevant information. If your amp uses the 6FL6 we have plenty. We have some of the PL tubes as well.
Of the two H3s we bought, one was made by Harvard and the other by Tech Electronics. Both were much more reliable than the NYAL version. If you go back to some of Futterman’s published schematics in engineering journals you will note that they were of low power design. Futterman got caught up in the power game when the H3 was designed and it’s no coincidence that reliability issues started popping up with the increase in power. Roger’s design will be in the neighborhood of 40 watts pentode/25 watts triode.
@tomic601 - Yes Roger was UVA undergraduate, then a year at Stanford. While your offer is appreciated, Roger became dismayed at what they were teaching at UVA these days and also became disenchanted that the young engineers to be were not interested in audio circuit design. As such he decided not to donate to any academic institutions. He instead has made other plans for his journals, recorded interviews (including Saul Marantz and Futterman among others), rare and exotic tubes, antique electronics, and intellectual property.
@ndevamp - yes your help would be appreciated, I will email you to discuss.
