image hosting

your own private (or public place) to document whatever.
dave slagle
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image hosting

Post by dave slagle »

feel free to use this space to host images.
dave slagle
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Post by dave slagle »

nt
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photoshopped 3C24 curves.
photoshopped 3C24 curves.
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dave slagle
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Post by dave slagle »

HK-54 for dowdy
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dave slagle
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bruce's amp resized.

Post by dave slagle »

just shrunk it a bit to avoid the dreaded bottom scroll bar.
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just hosting it here to keep the original post as presented and assure long life of the link.
just hosting it here to keep the original post as presented and assure long life of the link.
duobruce.jpg (40.24 KiB) Viewed 28358 times
Guest

Post by Guest »

This is the output from the right channel, inputs grounded.
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preamp_6DJ8.JPG
preamp_6DJ8.JPG (41.03 KiB) Viewed 28277 times
earwax

fi

Post by earwax »

Fi preamp
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Fi Preamplifier.JPG
Fi Preamplifier.JPG (47.56 KiB) Viewed 28254 times
slowmotion
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Location: Norge

Post by slowmotion »

That Fi pre looks good, I think

;)
dave slagle
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nt

Post by dave slagle »

nt
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nt
nt
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dave slagle
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Post by dave slagle »

nt
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dave slagle
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Post by dave slagle »

jh
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dave slagle
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Post by dave slagle »

vf
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dave slagle
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bb

Post by dave slagle »

bss
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jj
jj
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dave slagle
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pultec

Post by dave slagle »

pultec
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Pultec_HLF3.pdf
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j

Post by dave slagle »

hello
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dave slagle
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nt

Post by dave slagle »

nt
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rcl.gif
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Guest

h

Post by Guest »

message
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DC offset.jpg
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Dave Cigna
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Post by Dave Cigna »

hmmm
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CapacitanceInCMChoke.gif
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dave slagle
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plots fo NC

Post by dave slagle »

plots
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Source Z 25K, Grid L 3500K, Load 1Meg, Coupling caps .1, .3, 1, 6.5 uf
Source Z 25K, Grid L 3500K, Load 1Meg, Coupling caps .1, .3, 1, 6.5 uf
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Dave Cigna
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Post by Dave Cigna »

a colorful drawing
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ParafeedACLoops.gif
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dave slagle
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Post by dave slagle »

test
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loops.gif
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JeffreyJ
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parafeed loops...

Post by JeffreyJ »

ok.. I know I am suspect for having used parafeed for years.. but I am totally following my ears on all of these decisions.. and, yes, my last amp was series feed.. by choice...

but when looking at parafeed, at least give it the benefit of the doubt and return the ac loop to cathode.... get that nasty cathode resistor and cathode cap out of the loop... at least as much as possible.. it is *parallel* feed after all...

and, related, can't we also return the output tube grid resistor to the cathode of the proceeding stage? I know it changes bias, but we can correct for that... I just never tried it...

related, part B: is the "middle" ac path: plate of driver tube > cap > grid > grid resistor > ground and back through teh driver tube? man.. kinda makes that grid resistor super ugly.. I don't like resistors and there's a *big* one...

and lastly.. likely one for me... why not put a *choke* under teh cathode of a parafeed output stage of the return is to cathode... cool, huh? if your PS is quiet, I see no issues... maybe even a benefit...

anyway.. supposed to be cleaning.. fifty folks coming over tomorrow.. ugh!

Peace,
Me
Dave Cigna
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Post by Dave Cigna »

Transfer characteristics of 6AR8 beam deflector tube. It's sorta a small pentode with two plates and a pair of beam deflectors. When the difference between the deflector voltages is zero the cathode current is shared equally between the plates. When a difference is applied the current is directed more towards one or the other plates.

If you consider the deflectors as inputs then it is a differential amp (with PP outputs) in a single bottle. Appears to be pretty linear too, but the gain is low.
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6AR8 Transfer Characteristics.gif
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dave slagle
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hh

Post by dave slagle »

hh
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hh

Post by dave slagle »

hh
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Post by dave slagle »

mm
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