kevin gilmore

silicon carbide mosfet output version soon. all stock parts. too many projects in the air at the same time

same 10k input resistor, same 100pf cap. original was 10k x 4 pot.

my clone is an EXACT clone. every part in the same physical location as the original. Same exact board size etc. If I wanted to change it, it would not be an exact clone

same capacitance as 1 of them. Just bipolar. There were bipolar blackgates available, so you would need only 1

find me a piece that's 2 inch x 2 inch x 4 or more inches

Don't we charge for that?

actually you need 8 pins. the ccs transformers absolutely have to be inside the amp box, and you might as well put the other one there too.

you only need 6 pins which are a lot cheaper

http://gilmore.chem.northwestern.edu/knobs6.jpg bocote, lignum vitae, redheart snakewood,arizona desert ironwood, ebony black and white ebony red mallee and cocobolo as soon as they dry out.

should be final rev's of these two boards unbalanced/balanced to balanced http://gilmore.chem.northwestern.edu/ubaltobald3.zip ss dynalo balanced http://gilmore.chem.northwestern.edu/kgdynalobal5.zip

I have tested it, listened to it, works great. offset is 1.5mv going to swap out the opa445 for op27 and then remove the offset pots. and probably add a pot on the pnp current source to do a final trim. input impedance with the bipolars is 10k. replace them with the jfets and it works better

ball bearing from the back make sure no one pours water over the thing

because tyll's kgss absolutely needed a wood knob, I sent him the one I made out of Arizona desert ironwood. Which left me without one. So I had to make one, and I made another ebony one. black and white ebony and snakewood hopefully tomorrow. http://gilmore.chem.northwestern.edu/knobs5.jpg

http://gilmore.chem.northwestern.edu/ubaltobal1.jpg

the same connectors used in the diy-t2 but less pins. ugly but rated for the voltage and not plastic crap amphenol industrial circular connectors

no idea. probably china too. what evidently happened to wima is that when they switched to china they changed the sizes of most products, making them smaller with different films that are more tightly wound.

there is a thread over at diyaudio saying that since wima has moved production to china, quality has turned to absolute shit. time to buy caps from vishay

nopants you are fucking idiot. birgir and I spend hundreds of hours on this stuff and you make a stupid joke. not funny input board complete and works perfect. thd less than the base of my ancient test gear (<.002% thd, and absolutely flat) picture later.

you forgot to tell us that you let out the magic smoke

balance pot has to be set in the middle or bad things may happen. normally the pots are set to middle out of the box. its usually pretty hard to do diode checks in circuit and get reliable info if all the leds are lit it is working and maybe the one pot is shorted

http://gilmore.chem.northwestern.edu/ubaltobal.jpg rest of the parts on monday

you need a better solder sucker. but what you can do instead is remove the 4 x 2.2k resistors set the pot for maximum resistance to the xlr jacks, and wire a new one that way

the pcb is wrong. but you need to check the pot to be sure the pins on the pot should be ground,out,in

knobs need to be 2 inches or more thick. reason is I have to have something to grab onto reliably to put the insert in. once the insert is in, I can bring it down to about .8 inch deep. machining into the insides of an expensive 2 inch collet chuck might get someone really pissed at me if I make a mistake. I have enough now for about 20 ebony knobs. but none are absolutely black like the few I had made previously. will be getting enough wood to make doug a pair of panels anyway. need to find someone that has been sitting on a piece of pure black ebony for 30 or 40 years.

this is how it should be wired, but the pot is actually not wired like that if the footprint for the alps is correct in their documentation http://gilmore.chem.northwestern.edu/chinesekgss.pdf