...or since 22 years in guitar amplifiers like the boss mg-80:earthtonesaudio wrote:A JFET wired like that makes a "low leakage" diode. You'll sometimes see them used in low-drift peak detectors or sample/hold circuits.
Bearfoot - Model H [traced]
- tube-exorcist
- Resistor Ronker
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."
- phibes
- Transistor Tuner
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I still get a kick out all these "Hiwatt sound" in a box pedals. Do the guys designing really know what a Hiwatt sounds like or does everybody just base their Hiwatt sound opinion from Pete at Leeds (Which isn't a very good representation of the Hiwatt sound in my opinion)?
GuitarlCarl - "TGP = The Gear Polishers"
Ken
Ken
- RnFR
- Old Solderhand
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so what's the deal with the model with the 4049ube? is that the Bjfe version? i thought these were supposed to be the same!!! WTF??? not cool, man.
totally! Leeds is all Superfuzzy!phibes wrote:I still get a kick out all these "Hiwatt sound" in a box pedals. Do the guys designing really know what a Hiwatt sounds like or does everybody just base their Hiwatt sound opinion from Pete at Leeds (Which isn't a very good representation of the Hiwatt sound in my opinion)?
thanks for clarifications guys. i learned something today.tube-exorcist wrote:...or since 22 years in guitar amplifiers like the boss mg-80:earthtonesaudio wrote:A JFET wired like that makes a "low leakage" diode. You'll sometimes see them used in low-drift peak detectors or sample/hold circuits.
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- WhiteKeyHole
- Cap Cooler
There is a photograph on Flickr of a BJFE Model H that basically looks like the Stone Grey. Must be two BJFE versions, as the one in the photograph doesn't seem to have a trimmer. Makes sense. Would be pretty pointless to release the Bearfoot and the Mad Professor otherwise. Single PCB for three Bearfoot models.
What did they clear up? They told you what it is, where it's been used, not why it is. What is the reason for its low leakage.
What did they clear up? They told you what it is, where it's been used, not why it is. What is the reason for its low leakage.
- Whoismarykelly
- Resistor Ronker
Same. I built a DR103 which is basically THE Hiwatt a while back and even with all the controls on 10 it doesnt have 1/4 of the gain of most "Hiwatt pedals" have at 9:00 on their gain controls. Even the biacrown models with the extra gain stage aren't super gainy in any way.phibes wrote:I still get a kick out all these "Hiwatt sound" in a box pedals. Do the guys designing really know what a Hiwatt sounds like or does everybody just base their Hiwatt sound opinion from Pete at Leeds (Which isn't a very good representation of the Hiwatt sound in my opinion)?
- ShortScaleMike
- Resistor Ronker
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Unverified first pass vero - any comments/corrections/build reports are more than welcome
Thanks to all involved in the trace/schematic effort so far
Thanks to all involved in the trace/schematic effort so far
- phibes
- Transistor Tuner
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Exactly! I got a 77' DR103 and with everything dimed, I'll get as much break up as these pedals have at their lowest setting. If I was use my SG with hotter pick ups I can get a little more but with my Black Beauty with low output PAF's, it's just pure fucking headroom. Sends a twin reverb home crying everytime. Once you go Hiwatt, you don't go back!Whoismarykelly wrote:Same. I built a DR103 which is basically THE Hiwatt a while back and even with all the controls on 10 it doesnt have 1/4 of the gain of most "Hiwatt pedals" have at 9:00 on their gain controls. Even the biacrown models with the extra gain stage aren't super gainy in any way.phibes wrote:I still get a kick out all these "Hiwatt sound" in a box pedals. Do the guys designing really know what a Hiwatt sounds like or does everybody just base their Hiwatt sound opinion from Pete at Leeds (Which isn't a very good representation of the Hiwatt sound in my opinion)?
GuitarlCarl - "TGP = The Gear Polishers"
Ken
Ken
- earthtonesaudio
- Transistor Tuner
The geometries of the PN junctions are vastly different between a standard diode and a JFET. Low leakage is the reason JFETs have high input impedance. If you want better than that you'll have to do a lot of advanced reading.WhiteKeyHole wrote: What did they clear up? They told you what it is, where it's been used, not why it is. What is the reason for its low leakage.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- WhiteKeyHole
- Cap Cooler
Thanks, though I do understand the why of it -- the question was posed for rhetorical effect. I was pushing that he seek a real clarification.
- RnFR
- Old Solderhand
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well, i would think that since a high leakage device(Ge), essentially puts some sort of capacitance in parallel, reducing high end info whether to gr or in an nfb loop, a low leakage diode would keep all of the high frequencies in the clipping section.WhiteKeyHole wrote:Thanks, though I do understand the why of it -- the question was posed for rhetorical effect. I was pushing that he seek a real clarification.
how'd i do?
edit: or would it be resistance, effecting low end to gr, or gain in an nfb? can't remember at the moment.
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- earthtonesaudio
- Transistor Tuner
Leakage current in a reverse biased PN junction makes the diode behave a high-value resistor. Typical small signal diodes (1N4148 etc.) have leakage currents in the fractions of a nano-amp at room temperature and at low voltage. JFET diodes have leakage currents in the femto-amps.
The JFET will have significantly more capacitance than a small signal diode, but still probably less than 10pF.
My gut tells me the reason for the JFET clippers in lieu of small-signal diodes is purely aesthetic and has nothing whatsoever to how it functions electrically.
The JFET will have significantly more capacitance than a small signal diode, but still probably less than 10pF.
My gut tells me the reason for the JFET clippers in lieu of small-signal diodes is purely aesthetic and has nothing whatsoever to how it functions electrically.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- RnFR
- Old Solderhand
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you know, whatever the difference was, I didn't think it would be much. thanks for the explanation.
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- WhiteKeyHole
- Cap Cooler
That's good to hear. Thanks for taking the time to suss it out.
- ShortScaleMike
- Resistor Ronker
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Very nice, nicely done! My layout isn't verified so I'd say yours is the defacto standard.
The dimensions are pretty similar (22x16) vs (20x15) so I doubt it's going to cause anyone issues to get into a B box.
The dimensions are pretty similar (22x16) vs (20x15) so I doubt it's going to cause anyone issues to get into a B box.
- LooseCannon
- Solder Soldier
Hey guys,
I'm interested in building the Model H, the layout calls for two reverse audio pots.
Could I use different pots instead of these?
Can't find those nearby.
Thanks!
I'm interested in building the Model H, the layout calls for two reverse audio pots.
Could I use different pots instead of these?
Can't find those nearby.
Thanks!
- Nocentelli
- Tube Twister
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Two options:
Use linear pot, and the high gain settings will be all bunched up at 3-5 o'clock.
Use normal audio pot, but reverse the wiring of the pot lugs 1 and 3 (so use 1 and 2, not 2 and 3 for gain): The controls will work backwards, but taper will match the original.
Use linear pot, and the high gain settings will be all bunched up at 3-5 o'clock.
Use normal audio pot, but reverse the wiring of the pot lugs 1 and 3 (so use 1 and 2, not 2 and 3 for gain): The controls will work backwards, but taper will match the original.
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
- LooseCannon
- Solder Soldier
Nocentelli wrote:Two options:
Use linear pot, and the high gain settings will be all bunched up at 3-5 o'clock.
Use normal audio pot, but reverse the wiring of the pot lugs 1 and 3 (so use 1 and 2, not 2 and 3 for gain): The controls will work backwards, but taper will match the original.
I'll use the second option then. Thanks!
- fretzburner
- Breadboard Brother
Is the source and drain orientation correct?Like C4 and R4 should be at center pin of 2N5952?method wrote:I found this vero layout in a zip file stash I'd collected on my hard drive a few months ago. It is verified.