kevin gilmore

I love it a lot. lt1021 makes perfect sense, very stable part, stack of led's not needed etc...

http://gilmore.chem.northwestern.edu/ksa5-12.jpg finally putting it in a chassis

sweet!

get a VERY HIGH QUALITY SACD source. then get all of those prestige jazz sacd mono re-issues... blown away you will be.

just the volume knob set to zero is sufficient. the servo will get rid of a few mv of input offset. however as you turn the volume knob you will hear some "whooshing" depending on how much input dc.

I am really liking this amp. (I am possibly biased, usually into class A) Simple and effective. These boards are for all Motorola parts. each board is 300ma, so I think a sigma22 would work fine.

20pf for that. Supersymmetry is guaranteed unity gain, so no issues with any amount of gain. but gain of 2 unbalanced is as low as you can go with the topology. but unless you have a very high voltage source, what you could end up doing is clipping the source and essentially putting very nice square waves into your headphones.

its always 36 vac ct for the low voltage stuff. necessary to make about +20v and -20v to regulate down to +15 and -15 6.3V is for the filaments no idea where the 15vac came from. values should be the same 350v or 400v, possibly trim the one offset resistor.

the db5 is a nice touch

as long as the zero and offset are right, it will work fine. should work fine between +/-350 and +/-400

if you want a rock solid and stable to way less than 1% power supply you have to build the original kgsshv supply trimed down for voltage. its probably not necessary unless you really want the extra stability.

so birgir is a little bit off. With Justin's rubber feet The whole thing is 18 inches x 18 inches x 25 inches from the bottom of the power supply feet to the top of the tubes. yikes. USPS finally has pulled their heads out of their asses with slightly slower shipping for packages over 25 lbs, for a bunch less money. So only $165 to ship the brick of aluminum to Iceland. And it was over 51 lbs. Previously to ship T2 chassis which was 34 lbs was about $225 When he is done with this one, I will ship him the es1 I have. With the transformers. Then the only monster I will have left is the SS1 which is such a complete clusterfuck... Mikhail certainly was entertaining. I wonder who ended up with the gold plated sds-xlr?

at least the es2 is a sealed power supply box. my es1 has 2 large holes in the power supply box.

without the transformers without the tubes its 50 lbs

so how does it sound with hd800,lcd? etc... really people should build it with xlr jacks on the input, then if necessary use the neutrik rca to xlr adapters. I'm finishing my second one now, first time I have ever built more than one of the exact same item. Someone swiped my first one, and the chances of getting that back are pretty close to nil. part number of the power switch please. need to do a group buy of 4 deck rk27 10kohm... you did remember to remove the jumpers on the power supply board right??

actually ltspice is your friend. But its a bit of work. You can just overcompensate a bit, but then you won't be able to hear 150khz.

50k resistors and 5pf give a balanced gain of 14db which should be fine.

you should reduce the gain

and what is the voltage level. If its way high, then you definitely want to cut the gain of the headphone amp. some cut the balanced gain to 6.

birgir should have some quad pot boards left. also the layout is in the usual place.

green amphenol military connectors. Definitely the right way to go. very nice.

the square ones work fine with my stax jacks. the round ones work regardless. best to mount Justin's jacks to the front panel first, or drill all the way thru the front panel and use screws and nuts and then you can take it off.

use the little stax jack circuit boards. makes it easy.

so lets see cross coupled cathodes... Nope ultralinear... Nope enough gain to lower distortion... Nope local feedback around the phase inverter... Yup and bad too etc why didn't they just copy the mc40

ss dynahi way too much power for hd800's you would be much better off with the ss dynalo.