I've never heard on in person, but I like what I hear on youtube.
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Show posts MenuQuote from: J M Fahey on February 02, 2011, 07:37:00 AM
Sorry, didn't want to hurt anybody, all the contrary
Beyond that, we are on a technical forum here, and if somebody says 2+2=5, hurt feelings or not, I'll state the result is 4.
As of ROG projects, seeing a typical one gives me headache, the same kind I get when I hear somebody singing absolutely out of tune or playing very fast, missing 80% of the notes.
Let me explain that:
The Fetzer itself is the only serious part, and I was not referring to it.
Its designers know the triode curves they wish to approach, know what they actually have (pentode-like Fets), know all the theory, how things work, do whatever's needed to bend one into the other, brilliant !! :tu:
*But* cloning a tube design , and finding there a typical 1/2 12AX7 with 1K5 on cathode, 100K on plate, 260V B+ , 160V on plate, and substituting it with a Fet, using 1K5 on source ..... (why 1k5 ?).
There's 3 possible answers I can hear:
1) "because I decided I want that FET to pass 1mA and, look at the curves, this particular one passes 1 mA with any drain voltage between 3 and 30V and 1.5 Vgs , so [1.5V/0.001A]=1500 ohms".
*That* is the "serious" answer and the one I expect :tu:
2) "Duh?? "
Even this one is somewhat acceptable, sort of.
Nobody was born knowing, but studying or experimenting anybody can learn and advance.With some care it may end up good, in a near future
3) "Because Fender uses it" :duh
C'mon, you are kidding, right? This is magical thinking of the worst kind.
Why the worst? Because to the uninitiated it "sounds" logical, even powerful (Mojo) , pure pseudoscience.
Add this to the power of internet, and another impossible to erradicate myth is born and spread. :duh
I repeat, I find *good* design work the Fetzer approach and the work of all others who took it seriously, such as KMG, Lab Series, Mensur, Trace Elliott, Yamaha, Roland, Univox (Westbury) and the granddaddy of them all: Randall.
1K5? 9V? Forget it !! (unless you buy 100 fets to farm the 5 to 10 amongst them which might be happy with that value)
*None* of the above mentioned established manufacturers uses anything even approaching that Fet-unfriendly combination.
....
QuoteFrom joecool85: And lastly the items I can't get as mentioned above I try to get from (in this order) the UK, Japan, Taiwan, Korea. This is primarily for electronics.