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    Building, troubleshooting and testing of these amplifiers should only be
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SY gets jiggy (5692 measurements)

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#21
Well, you touch on a point near and dear to my heart- some tube types and manufacture are just not great, others are. These 5692s are a lovely example; the distortion spectra are consistent and low, not a true duff tube in the bunch. And look at the standard deviation of the RCA red base set! If I had opened 9 bottles of Lafite from the era when these tubes were made (say, 1961), I seriously doubt I'd see anything like this sort of consistency.
 
#22
SY said:
Well, you touch on a point near and dear to my heart- some tube types and manufacture are just not great, others are. These 5692s are a lovely example; the distortion spectra are consistent and low, not a true duff tube in the bunch. And look at the standard deviation of the RCA red base set! If I had opened 9 bottles of Lafite from the era when these tubes were made (say, 1961), I seriously doubt I'd see anything like this sort of consistency.
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Nine bottles of '61 Lafite?! That'd buy you enough tubes for a lifetime. Back in the late 70's I had a bottle of '61 Talbot. For some reason a number of bottles showed up locally at reasonable prices (maybe 20-30$). One of the best wines I've ever tasted.

Sheldon
 
#23
Old Talbots get a distinctive poopy aroma (the "Cordier Stink") which I like a lot. The '86 is still my all-time fave. It's a Bordeaux trying very hard to be a Rhône.

Back on-topic, I ran my first set of ECC88 measurements last night, mostly as a warm-up to a full day of massive data-taking, to rewire sockets, check out voltages, gains, control settings... When it's all done, it'll get a thread of its own, but I did note some REALLY bad variability in mu, consistently worse distortion results than 5692s at that output level, and (Frank will love this) apparently the best performance from CCa of all the varieties I have in hand.
 
#26
Hi,

and some stuff from your coffee cans, and generate individual tube curves?
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Can be done but no matter how computerized you are, it's stil going to be a time consuming hobby.

You're looking at a good fifteen minutes of warm up time for small signal bottles, twice as much for the power tubes at the very least.

Here's someone who actually did it:

KLAUSMOBILE


Cheers,😉
 
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