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211 Works Well Also...

Posted by Triode_Kingdom (A) on July 22, 2018 at 19:15:11

In Reply to: FS-100 PF and GM70 and 845 amp DIYers posted by Tanker on June 16, 2018 at 08:06:16:

What does the "PF" stand for? And who said the OPTs aren't guaranteed at 1KV? Did Mike say that? I have a pair of FS-100 OPTs (not PF) residing in my 211 monos, and it's my understanding that's the type of service they were designed for. The PS provides about 1,050V and each output idles at 75-80mA. The driver is a choke loaded 6BL7 follower. Each amplifier outputs about 15W in Class A and can be driven to near the 30W power rating of the transformers in A2. Filaments are powered with ultrasonic heaters operating at roughly 60 kHz. Be warned, it's a major project putting all of this together. I'm still revising after more than 10 years. :)

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