kevin gilmore

multi frequency ring a ding ding

anything that forces the bias voltage above 600v is going to damage the headhpones. So a fet that is shorted Drain to Source, or a tube that is shorted plate to cathode. or massive amounts of negative dc on the input.

tyll tested the korean version i think.

Actually it's ok for tube amps without a delay because the positive turn on bump subtracts from the bias

Winer project? drinking 1994 BV George's de latour now. left over from last night. Yumm

About 300 ohms is the right number, don't know if that's total or just the tail resistor. Less ohms in the pot and most in the resistor is what we are aiming for. zener needs to change to 18v

updated picture, everything is there. need something for C- supply board is 8.9 x 5.05 need to find hole sizes for the big caps

take a look at the picture which I just updated

I moved a whole bunch of parts

I have nothing to do for the next couple of days, so I could do the board. the one pass fet is not available at mouser, so something different is needed, need sizes of the caps and how much power (i.e. on board heatsinks, or aluminum bracket) etc

2sc5171 not recommended for new designs, which means soon to be discontinued. different pinout than the layout, it could make another layout if people are interested. Or you mount it upside down which is possible. 500 piece minimum from digikey, non-stocked at mouser. adjustable bias, current sources at the top

16 watts per channel for the 10m90s plus another 10 watts for each power supply

same as carbon makes it easy to fit in the box

those diyclub attenuators are the same one Mikhail used. They work fine. Physically pretty gigantic.

the 2sj79 and 2sk216 are 200v parts, the ksa1220a/ksc2690a parts are 160 volts. would probably work if you are careful.

in the original kgbh, the 2sj79 can be replaced with a ksa1220A and the 2sk216 can be replaced with a ksc2690a. Not the same pinout. someone would have to test, but synthesis shows it would definitely work. in fact the ksa1220a and ksc2690a are faster and lower capacitance parts than the originals.

t2shrunk2 updated. definitely missing the one land. not sure how that happened.

ignore the tube pin numbers, they do not show up anyway. its how that socket was made when I did the t2 picture above updated

updated file current thru the tube designed to be 20ma, so a bit more than previous driver transistor is ksc2690a only, dissipates a little less than 1W, needs very small heatsink you loose about 45 volts across the tube, so +/-450 is ideal

board file posted I can do the same thing with the nanotube, for the ultimate in gigantic. fets, triodes... its all the same thing...

I can put up jiml's gerber file on my server, or convert over to my software with a decent picture.

have not built one yet. may change the drive transistors to ksc2690A been thinking about this a while, saw no reason not to do the board. 5.6 x 4.7 inches

kgsshv-carbon with the sic-fets turned into 6ca7 was going to be next year

My boards are the original circuit exactly. And sounds like the original, exactly. the crap from China is something else entirely some have half the output transistors, some have half the capacitors, none have the original power supply etc. some don't run at the right voltages etc. cheap crap, krell in name only

since its Christmas, I will be nice. 1) your son is a fucking clueless idiot that has obviously not fallen far from the tree. 2) you obviously did not read the thread 3) The original krell board for which I have exact copies of pictures of the top and bottom of the board supplied from krell directly thru tom... The original krell board was hand layed out with film and tape on .1 inch centers. The left and right channels were not physically identical. My version made the left side identical to the original with each component exactly in the same place on the board. And each circuit land in exactly the same place except electronically aligned. Then the right channel was an exact duplicate of the left channel. So mine is actually a bit better. I just posted a new version of the board with teardrops enabled. 4 or more layer boards can also be done without destroying the board. You just need a large plate medical Xray to do so. And I have one.