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Higher power AVVT tubes

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Posted on April 17, 2000 at 10:31:36
Rob F


 
Anyone care to comment about your experiences with the higher outpuut AVVT 300B and 2A3 tubes? How do they sound in comparison? Do they need specially matched transformers, or curcuits? (some are "direct replacements" according to site)

If they work, they would seem to solve the problem of matching my 90 db speakers with a 300B or 2A3 based SET amp. (eg: 20 watts/ 40 watts, etc.)

FYI: http://elektronenroehren.de/avvt/indexf.htm

Thanks.

Rob

 

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Re: Higher power AVVT tubes, posted on April 17, 2000 at 22:51:06
Paul Joppa


 
They sound pretty good - most people like them at least as well as the originals, though (of course!) not everyone.

They will not in general give any more power in the same circuit. To take full advantage of their power capacity, you need a circuit designed for that - i.e. more voltage and current from the power supply, a larger output transformer, etc.

 

Getting the power from these tubes, posted on April 18, 2000 at 05:22:58
Rob F


 
Well, that would bring us to the next question. Are you aware of any amp curcuit designs/kits that have been created for these tubes? Or perhaps; would it be fairly simple to take an existing design, say Bottlehead's new Parabee, and convert it to realize the full potential of these tubes?

I see an SET in my future, but would rather open up my choices of a good speaker match.

I appreciate your comments.

Rob

 

Re: Getting the power from these tubes, posted on April 28, 2000 at 22:08:00
Paul Joppa


 
Few and far between. Nobody wants to make a 300B amp that can't run any 300B you might want to try. The 300B spec says they can take 40w of plate dissipation, so an amp designed at the 300B limits would be quite happy with a higher-dissipation tube, allowing it to last a long time (even the WE 300B will die sooner at 40w than at 25w). You should be able to get 12w of clean output if it's done right.

There ARE some transformers available from several makers that are designed to take the higher currents, so a full DIY amp is possible. I think AVVT has some amps they build for their own tubes, also - haven't surfed their site lately though.

 

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