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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: 211 SET Amplifier (Single Ch) posted by fred76 on April 8, 2007 at 09:17:47:
Two factors influenced the choice for the SRPP (in addition to usual criteria like availability, sonics, etc.). First, I simply prefer US-made octals. That's especially true when the output stage is a classic triode like the 211 or 845. Second, there's a concern in this circuit regarding heater/cathode breakdown voltage. I initially used a 6SN7 in this position, but was worried about reliability because of its 90V rating. The 6BL7 is rated for 200V, and I know from experience in high-power RF applications that it will handle much more. Of course, I could have added a floating filament transformer, but I decided there wasn't much to gain. The 6BL7 has a very nice and open sound in this circuit, a quality that I attribute in part to the higher than usual B+.
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Follow Ups
- Re: 211 SET Amplifier (Single Ch) - Triode_Kingdom 13:55:55 04/08/07 (1)
- Re: 211 SET Amplifier (Single Ch) - fred76 08:33:54 04/09/07 (0)
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