Voltron Posted December 4, 2014 Report Share Posted December 4, 2014 Op-amps are the best for rolling. Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted December 4, 2014 Report Share Posted December 4, 2014 Erwin, when did you turn ninety? Quote Link to comment Share on other sites More sharing options...
wink Posted December 4, 2014 Report Share Posted December 4, 2014 Minus 24 years ago Quote Link to comment Share on other sites More sharing options...
spritzer Posted December 4, 2014 Report Share Posted December 4, 2014 Now here is a thought, build a Blue Hawaii with SicFets instead of the tubes. It has come up to make a cross between the ST and the BH in the past which would be easier to build and use some of the pentodes. 1 Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted December 4, 2014 Report Share Posted December 4, 2014 Are SiCFets the same as MOSFets? That sounds interesting...I'd love to hear that. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted December 4, 2014 Report Share Posted December 4, 2014 Minus 24 years ago Definitely don't attempt to learn anything about circuit design in your later years. Once you realize how many ways you can building simple circuit elements and how these are "chosen" by designers, then you would probably be paralyzed completely. Quote Link to comment Share on other sites More sharing options...
spritzer Posted December 4, 2014 Report Share Posted December 4, 2014 Are SiCFets the same as MOSFets? That sounds interesting...I'd love to hear that. They are mosfets but better. We will use them in the new Carbon amp for which I hoped to have the PCB's tomorrow. Just checked the tracking and they went their usual route except not going from the UK to Iceland but rather UK to Japan... Fuck!!!! Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted December 4, 2014 Report Share Posted December 4, 2014 :palm: Quote Link to comment Share on other sites More sharing options...
skullguise Posted December 4, 2014 Report Share Posted December 4, 2014 Quote Link to comment Share on other sites More sharing options...
wink Posted December 5, 2014 Report Share Posted December 5, 2014 So, a Blue Carbon is on the horizon? KGBC. Definitely don't attempt to learn anything about circuit design in your later years. Once you realize how many ways you can building simple circuit elements and how these are "chosen" by designers, then you would probably be paralyzed completely. Are you denying me the opportunity to become a Cavalli, Woo. et. al.? Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted December 5, 2014 Report Share Posted December 5, 2014 No, he was extrapolating your tube-rolling problem to amp-rolling. 1 Quote Link to comment Share on other sites More sharing options...
Cucera Posted December 5, 2014 Report Share Posted December 5, 2014 Now here is a thought, build a Blue Hawaii with SicFets instead of the tubes. It has come up to make a cross between the ST and the BH in the past which would be easier to build and use some of the pentodes.I am really interested in this new amp. As much as I love my BHSE usually I prefere solid state because of the convenience. And those new transistor types made me curious since reading Nelson Pass' article on them two years ago. http://www.firstwatt.com/pdf/art_sit_intro.pdf Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted December 5, 2014 Report Share Posted December 5, 2014 Those were SIT's, and evidently had a short life because all the manufacturers went out of business quickly. Static induction transistors. These Silicon Carbide Mosfets (and one company makes jfets) act like standard mosfets except are very high voltage, very high current and can run up to silly high temperatures. Also negative temperature coefficient, so no thermal runaway. And lower capacitance than the crap cavalli uses, so much easier to drive at high frequencies. Quote Link to comment Share on other sites More sharing options...
nopants Posted December 5, 2014 Report Share Posted December 5, 2014 sounds perfect for electrostatic output devices...maybe current sources too? Quote Link to comment Share on other sites More sharing options...
wink Posted December 5, 2014 Report Share Posted December 5, 2014 http://en.wikipedia.org/wiki/EL34 The EL34 was widely used in higher-powered audio amplifiers of the 1960s and 1970s, such as the very popular Dynaco Stereo 70 and the Leak TL25(mono) and Stereo 60, and is also widely used in high-end guitar amplifiers because it is characterized by greater distortion (considered desirable in this application) at lower power than other octal tubes[citation needed] such as 6L6, KT88 or 6550. The EL34 is found in many British guitar amps and is associated with the "British Tone" (Marshall, Hiwatt, Orange) as compared to the 6L6 which is generally associated with the "American Tone" (Fender/Mesa Boogie). http://en.wikipedia.org/wiki/KT88 Historically, it has been far more popular with high fidelity stereo manufacturers than guitar amplifier builders, given its characteristics of high-power and low-distortion. Due to these characteristics, it is regularly used to replace 6550 tubes by end users seeking a guitar amplifier tone with less distortion. Maybe we should ask KG if he could design a BHOP (Blue Hawaii OverPower) Should set the DIYT2 on it's seat..... KT88 =100 low distortion watts EL34 = 55 higher distortion watts. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted December 5, 2014 Report Share Posted December 5, 2014 One can not generalize a tube's performance outside of its topology. Wikipedia is wrong. 2 Quote Link to comment Share on other sites More sharing options...
n_maher Posted December 5, 2014 Report Share Posted December 5, 2014 <snip> Wikipedia is wrong. 1 Quote Link to comment Share on other sites More sharing options...
spritzer Posted December 5, 2014 Report Share Posted December 5, 2014 (edited) Now, now Marc... attacking the integrity of Wikipedia!!??!! For the record here is the BHSE vs. the KGSSHV mini BHSE 100hz - .003% 1khz - .0032% 10khz - .0078% 15khz - .0049% 20khz - .0051% 20khz - .015% (with 30khz low pass filter disabled) KGSSHV mini first proto w/J2145 output and gain devices kgsshv thd results @ 100Vrms and 30khz low pass filter enabled: 100hz - .0087% 1khz - .0084% 10khz - .0107% 15khz - .0222% 20khz - .0259% 20khz w/ 30khz low pass filter disabled - .0719 both channels are very close to the same thd Given the gain it's hard to go much lower than that. Edited December 5, 2014 by spritzer Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted December 5, 2014 Report Share Posted December 5, 2014 lets not forget the cavalli .000000001 % thd at 20hz to 20khz at any level including clipping 2 Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted December 5, 2014 Report Share Posted December 5, 2014 Shenanigans! Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted December 5, 2014 Report Share Posted December 5, 2014 Now, now Marc... attacking the integrity of Wikipedia!!??!! For the record here is the BHSE vs. the KGSSHV mini Given the gain it's hard to go much lower than that. How is that possible! I thought silicon had lower distortion than vaccum state technology? Thankfully transistors require one to use a soldering iron to remove... Imagine if you could simply unplug them and use a different one? Such an incredible bar which prevents the depravities and proclivities of old age! Quote Link to comment Share on other sites More sharing options...
nikongod Posted December 5, 2014 Report Share Posted December 5, 2014 Thankfully transistors require one to use a soldering iron to remove... Imagine if you could simply unplug them and use a different one? Such an incredible bar which prevents the depravities and proclivities of old age! I feel like I'm going to make a foll of myself for not seeing blatant sarcasm... But you can socket transistors. A few trimpots or socketed resistors (or a transistor and its matching resistor on a little daughter-board so you only have to plug in one thing and never have to bend leads and could maybe even replace a single transistor with an op amp if you wanted) and the KGNCA (KG necessarily complicated amp) would be infinitely transistor roll-able. 1 Quote Link to comment Share on other sites More sharing options...
spritzer Posted December 5, 2014 Report Share Posted December 5, 2014 It's all fun and games until somebody plugs in a 400V transistor. "It had the same footprint!!!" That's why only hardcore tuberollers try anything with an octal base in the BHSE.... Quote Link to comment Share on other sites More sharing options...
nikongod Posted December 5, 2014 Report Share Posted December 5, 2014 (edited) I was thinking primarily of the transistors in the low-voltage input stage. Or using this in a dynamic/low voltage amplifier. Edited December 5, 2014 by nikongod 1 Quote Link to comment Share on other sites More sharing options...
justin Posted December 6, 2014 Report Share Posted December 6, 2014 and i just donated to them today Quote Link to comment Share on other sites More sharing options...
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