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Read the Post in new Window Read the Post in Threaded view  Post #66: Possibly lower in the treble by nl on 2009-06-18 
Browse the content of the threads in new Window  Thread: RAAL “Water Drop” tweeter for Macondo. in Horn-Loaded Speakers  77 Replies 
Using an S2 above 8Khz or so is well into its breakup range. I would consider either a 1" exit/2" diaphragm driver or possibly a bullet tweeter that is comfortable down to 8K or so....

Read the Post in new Window Read the Post in Threaded view  Post #4: Weak SET bass by nl on 2009-06-17 
Browse the content of the threads in new Window  Thread: Small SET’s bass, besides everything- is it about power? in Audio Discussions  4 Replies 
The weak bass of low-power SET amps is well known. I don't think anyone would disagree.Some reasons:Simple low power, especially with 93db speakers (try with 106db like Yorkville LS1208 horn subwoofer it might be different).SE output transformers hav...

Read the Post in new Window Read the Post in Threaded view  Post #344: DHT drivers by nl on 2009-06-17 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Why do we use DHT tubes? it is not because of their technical specifications. They have low transconductance, a problematic direct filament, and they cost a lot.Obviously, it is because of their sound. Some people like it and some people don't.The DH...

Read the Post in new Window Read the Post in Threaded view  Post #57: Blah blah blah by nl on 2008-12-03 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Yes, well, in this case, it wasn't a new amplifier, it was his old amplifier! At the end of the day, he tried it and came to a personal conclusion. I also tried it and came to a personal conclusion. Romy is still just farting into the air. This...

Read the Post in new Window Read the Post in Threaded view  Post #54: Don't waste time being "creative" by nl on 2008-12-03 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
There is no "one tube DHT amp." There are only amps with gain in one box or two boxes. Your 6E5P tube is not so special. People have been making WE437 spud amps since the 1960s. There is a class of amps that use a high-gm tube driver and a DHT out...

Read the Post in new Window Read the Post in Threaded view  Post #50: One stage by nl on 2008-12-03 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Given that you are using a solid-state preamp with presumably lots of driving power, you might consider a 1:4 stepup and use of either an EML 20B tube or the AVVT AV8 tube. That might get you enough gain. I think Rankin used the 20B in his Mercury am...

Read the Post in new Window Read the Post in Threaded view  Post #49: One other thing by nl on 2008-12-03 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Lastly, put in a line-level filter at the input instead of using a speaker-level crossover. The same circuit as is used with your 6E5Ps would be fine....

Read the Post in new Window Read the Post in Threaded view  Post #48: One-stage DHTs by nl on 2008-12-03 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, not much power and...

Read the Post in new Window Read the Post in Threaded view  Post #25: "soul" of tubes by nl on 2008-11-30 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
I don't mind talking about the "soul" of tubes. In my experience, the Kron 2A3 is vastly better Sovtek, etc., and better than NOS RCA 2A3 in my opinion. It has much more "soul" -- to the extent that listening became rather dull without it. I was shoc...

Read the Post in new Window Read the Post in Threaded view  Post #21: Sakuma's place by nl on 2008-11-30 
Browse the content of the threads in new Window  Thread: The Sakuma's Show in Audio Discussions  35 Replies 
I have visited Sakuma's restaurant myself. You don't need to travel to Japan to know that stock Altec A5s and Lowther-based designs from the 1960s basically run in the 70hz-12000hz range. They are in mono, and not particularly well-placed. That is...

Read the Post in new Window Read the Post in Threaded view  Post #21: Dht-dht by nl on 2008-11-30 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
If one dht is good, two must be better? I don't know. Some people like combining 6C45 etc with DHT, supposedly mixing the appealing qualities of each. Other people find that using a 6C45 (or other high-gm tube) with a 300B just makes a 300B sound...

Read the Post in new Window Read the Post in Threaded view  Post #19: My experience with DHTs by nl on 2008-11-30 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
I am interested that Romy has found some interest in DHT amplifiers. Many, many amp builders have used many, many tubes over the years, including many IHTs, triode-wired pentodes, etc. Japanese builders have used big transmitting pentodes driven i...

Read the Post in new Window Read the Post in Threaded view  Post #16: Altec 210 by nl on 2008-06-15 
Browse the content of the threads in new Window  Thread: The European Triode Festival’s horns in Horn-Loaded Speakers  57 Replies 
Of course i am referring only to the horn part of a 210-type enclosure. Below the horn cutoff, perhaps around 70hz for the 210, the remainder is filled in with a wooly bass-reflex peak, which gives these boxes their characteristic fluffy, indistinct,...

Read the Post in new Window Read the Post in Threaded view  Post #14: Bass bins by nl on 2008-06-15 
Browse the content of the threads in new Window  Thread: The European Triode Festival’s horns in Horn-Loaded Speakers  57 Replies 
Hello Romy, I understand the difference between the kind of "basshorn" pictured here and the proper compression-horn that you use. It is true that many DIY-types like to make basshorns in their garage without much thought to technical consideratio...
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