• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Greetings from ETF!

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I also avoided the shootout, thirty two times 'New York, New York' in a row is too much for any man. This was actually a nice time to do some quiet listening and compare the GM70 with WWII British military Vortexion 6V6 amps. The latter had a very lovely midrange but the bass was lacking. Which was not necessarily a bad thing given the room conditions which resulted in very colored and boomy bass (and this with Quad ESLs from all speakers :scratch:). I still love the GM70 SE on these speakers.

We did do a (very small sampled) 300B shootout which confirmed earlier comparisons done by me and DHT Rob (amongst others): the WE new production is top quality. Very very nice sound indeed.
 
None of that cheap "aspirins in water" stuff for our man SY... What was it like?

On the transformer shootout scene, what were the cheapest/most common represented, and what was the most exotic? Were any homemade transformers in the shootout? How did the ones that flunked out manifest themselves? I doubt that my program sources or my speakers are good enough to make such fine distinctions yet, but it would be nice to know the criteria used. Were the early washouts really obvious? It's a good idea to sneak some Gallo Mountain Red into the hooty-tooty wine tasting for a reality calibration....

I'm not an expert in this xformer area, and I didn't really make detailed notes. One thing I remember though was that one 'unknown' transformer hidden in a tea can (or was it a washing powder can?) did make it to the last 6 or 8 before it lost a pairing. By that time, a lot of heavy boat anchors had already bitten the dust. So the tea can was opened and showed an unassuming, puny little piece of iron...
One other interesting 'xformer' was actually a breadboard holding a transformer, a tube and some other ancillary electronics to 'mimic' a SE transformer. IIRC it also did quite well towards the finals, but not without some protests from the audience.

I also would like to know what the correlation was with the measurements, I didn't quite get what they did with those numbers. Maybe they just tested them for shorts and unlikely impedance values.

jd
 

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Of course, being very aware of the usual group dynamics and psycho-acoustics involved in these events, I kept track of the outcomes of each paired test. The first 8 or 10 all were 'B preferred'. Someone else apparently did the same and mentioned it aloud. Sure enough, the next test came out 'A preferred'. Coincidence? Possible.😉


jd
 

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I also would like to know what the correlation was with the measurements, I didn't quite get what they did with those numbers. Maybe they just tested them for shorts and unlikely impedance values.

jd

Jean Michel Le Cléac'h did some pragmatic measurements:

An externally hosted image should be here but it was not working when we last tested it.


Soon to be published I beleive.

Yves. (OPT N° 26 😎)
 
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