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Post by hornucopia on May 11, 2022 13:38:07 GMT
You valve guys (Fire and Big - bottle?) can read through this and hopefully make sense of it all. The amps are being used by Diptyque at Munich show. |
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Post by firebottle on May 11, 2022 14:36:37 GMT
Using a circuit that equates to a bridge for audio output using valves is not new, even I have experimented with it myself.
The Graaf GM20 uses a circlotron configuration which is an effective bridge output with individual pos and neg power supplies, using 2 output valves.
This approach looks interesting as 4 valves are used to make the bridge function, HOWEVER as there aren't 'negative polarity' valves they are cheating a little bit by using complementary power transistors to do the heavy lifting, in other words to supply the current to the speakers.
By describing this as 'The SQUARE TUBE is not a transistor amplifier preceded by tubes, it is a tube amplifier assisted by transistors' is a bit of BS.
It is a tube amplifier succeeded by transistors, so is in reality a HYBRID. No shame in that, hybrid circuits work very well, a la BB Ultime.
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optical
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Post by optical on May 11, 2022 14:39:32 GMT
Using a circuit that equates to a bridge for audio output using valves is not new, even I have experimented with it myself. The Graaf GM20 uses a circlotron configuration which is an effective bridge output with individual pos and neg power supplies, using 2 output valves. This approach looks interesting as 4 valves are used to make the bridge function, HOWEVER as there aren't 'negative polarity' valves they are cheating a little bit by using complementary power transistors to do the heavy lifting, in other words to supply the current to the speakers. By describing this as 'The SQUARE TUBE is not a transistor amplifier preceded by tubes, it is a tube amplifier assisted by transistors' is a bit of BS. It is a tube amplifier succeeded by transistors, so is in reality a HYBRID. No shame in that, hybrid circuits work very well, a la BB Ultime. Great reply Alan, even I understood a bit of that!  |
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Post by antonio on May 11, 2022 15:00:15 GMT
Plus One with that comment Optical - didn't Kora come out with a well thought of phono stage a few years ago, pretty sure it didn't have valves in it though, but I could be wrong  |
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Post by firebottle on May 11, 2022 15:51:12 GMT
Just read through the whole blurb.
A lot of it describes common functionality in most amplifiers, methinks the spec/marketing writers had a target number of words.
Expensive too.
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