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I seem to recall reading several posts fairly recently about operating points for either(not sure which) of these tubes. I have searched and can't seem to find anything. I'm really interested in a SE amp that puts out a bit more(say 4-5 watts) than than the typical 2A3/45 design without getting into the cost of using 300Bs. I'd also like to avoid high B+ if at all possible. TIA
Follow Ups:
Below is a set of operating points published in Stereo Sound in issue 201.845 tube
430 plate volts
62 madc plate current
-51 grid volts
5,000 ohms pri impedance
4,000 milliwatts power output
I heard an amp that ran at values very close to the above. I thought it sounded really great. Had a lot of weight, authority, impact and the a very warm effortless sound.MSL
I have always thought about this.Would it work with a 3.5K transformer?
Still keeping the 60mA or so operating point..
Just curious.
Richard
Hey Mikey!
How much snow did you get the other day? Say, old hoss, would you by any chance know of a schematic that uses those operating points or could be adapted to them? I really want to try a low power 845 but I am not at a level yet where I can design my own. Thanks!
Vinnie
Thanks, this seems to be what I recall seeing some time ago. Any ideas about output iron that would be up to the quiescent DC current?
At low power, I suggest u go for 845 more than 211. You can have 15W, 750V plate, -98V grid, 95mA plate current, with 3.4k ohm output transformer. So, your can have a 30W+ output transformer either for 300B or 845.I remember someone here said operate 845 at around 500V. Someone also told operate 211 at 560V and 10k output for 2W output. Anyone can tell me the operating point?
I also have a 845 SET built two years ago and I want to tweak this.
The voltage on the plate is now 790V and I want to try lower voltage ans parafeed. Anyone could recommend the right step for parafeed and the lower output into 92dB Ariel? OPT is cheapy Z core 7K.
the drive was 6BM8 in SRPP from the svetlana page.I look forward to many answers
Charlie
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