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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Your last sentence is something that does need an eye kept on it but generally if signal levels are so low as to make noise an issue then the output swing will be quite low anyway. Op amps such as a TL071 which don't like to drive anything below 2k or so should be avoided in such circumstances! (but it's noisy anyway!)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The amp sounds great with EL34s (it's a Plexi style amp, so that's absolutely its core thing)
I guess it's just an odd cocktail to be avoided.
Baz, I wouldn't faff about for resistors. Just get one or more of these,
http://uk.farnell.com/te-connectivity-cgs/hsc10010rj/resistor-100w-5-10r/dp/1174288
Virtually indestructible.
Dave.
If so you either need to decrease the NFB slightly, or add some caps to the grids of the power valves - as Fender did in the late 60s on the early Silverface amps when they also had stability problems.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
What's the easiest way to non-destructively test the NFB option? - put a larger resistor in parallel?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Re the DIY load box - the 24 ohm load was based on an assumed 16 ohm output.
I typically run at 8 ohms, so it is as simple at bringing the load down to 12?
Looking at a few more schematics for this, most seem to show the load going straight to ground with smaller resistor and pot feeding from the 'front' of the load with a larger (750k in one case rather than 82k) resistor going the pot (now 100k rather than 5k) and then the line out jack
So is my original understanding of the load, 82k and 5k pot all in series a different flavour of this or did I just plain mis-understand the concept and these are one in the same with different resistor and pot values?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein