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#281 |
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diyAudio Member
Join Date: Oct 2005
Location: Essex/Suffolk borders.UK
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#282 |
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diyAudio Member
Join Date: Jun 2004
Location: Cool end of a soldering iron NW of Toronto
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I can feel the radiant heat from here across the pond! Safety aspects aside, that's definitely a fun project! How high is your killer B+ ?
__________________
I.Q.Test. Have you ever purchased a recreational snowmobile? |
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#283 |
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diyAudio Member
Join Date: Oct 2005
Location: Essex/Suffolk borders.UK
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Actually, it's not that high.
I was advised that 1,000V was minimum for good results, but with the PSU bits I had to hand iv'e "only" managed about 950V HT First version used my 300b SET amp via a 5K output transformer on the 16R tap to drive the 833a grid, sounded very nice. Version 1A used a small interstage transformer at about 1 :4.5 ratio, but that was less successful. ![]() Current version (mk 2) uses a 6SN7 and EL34 (as cathode follower with fixed negative bias) to drive 833a. Next version will give a negative supply to the EL34 cathode to correct a slight anomaly on the waveform that the scope found. Philip Ramsey (Bluebell Audio) is trying to get Hammond to make some special interstage ( about 6:1 from memory) driving transformers, as he thinks that is the best way. I'm sure going to want to try them when (or if) they become available. |
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#284 |
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diyAudio Member
Join Date: Feb 2012
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I don't think this circuit going to work, but I am going to post here and asking for your input.
I want drivers and output tube use the same DC supply. Keep power supply simple Thanks, 101Audio |
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