kevin gilmore

Need to test the current sources and adjust them to 2ma each. Then the rest should be easy unless there is a major mistake in the circuit board. (like flipped feedback) Need to check more, maybe later today.

that is the correct orientation. change out the 1.2k resistors in the current sources for 2k resistors which should lower the current enough so that we can figure out what else may be wrong. these current sources may have a broader cutoff voltage range than the 10m90s.

The boards are designed the same as the T2 boards. So if you mount the transistors from the top of the board, you bend the pins back and stuff into the board. If you mount the transistors on the bottom of the board, you bend the pins forward and stick thru the board.

??

Someone needs to check the layout of the ixys current source parts on both kgsshv amp boards, andy is having trouble, and i think there may be a problem. I'm moving one of my labs today, so i don't have much time. Edit: the board sure looks right, the drain connects to B+.

The coupler is a stock part at mouser, all you have to do is drill out one end.

ROUND is a shape!

nothing usable but here are the numbers from the circuit board which is 11.950 x 16.00 There is .1 inch between the front of the circuit board and the inside of the chassis. From the front center of the circuit board, in inches +1.900,+2.575 +5.465,+2.575 +12.150,+2.500 +13.950,+2.500 +1.900,-2.575 +5.465,-2.575 +12.150,-2.500 +13.950,-2.500

I was not planning on doing the phono stage. Seems a bit silly as i have not played an lp in 16 years. The input board will be all balanced inputs. If you need an unbalanced input you can use the rca to xlr adapters.

So the thing has morphed a bit. And i like it, there is a board rev 0 that needs a fair amount more work. Its currently 6.5 x 3.6 inches, but i will be able to shrink it a bit. The original blowtorch was a bit sensitive to load impedance, and did not like driving 50 ohm loads (100 ohm balanced) So i fixed that. The original was unbalanced input only too. I also fixed that. The result is a balanced dynalo style setup. 2 choices of feedback, super symmetry or the john curl feedback. The two sound a bit different. Turns out super symmetry depending on how you view the "utility" of the patent is actually to feb 4, 2014 2 choices of power supply, +/-15 or +/-20 the later has slightly lower distortion. 2 choices of inputs, bipolar or fet. The bipolar results in a lower input impedance, but otherwise identical performance. bipolar part available from mouser. Singles versions of the fets available wherever you can find them. Wider range servo to accomodate the bipolar input parts. For the unbalanced to balanced version, you have a choice of .5x or 1x (unbalanced/balanced) or 1x/2x For the output amp version you have a choice of 5x or 10x output amp drives 32 ohm headphones in balanced mode if that is what you want to do. mates perfectly with the step attenuator board. So there will be a 100% mouser sourced version.

wow, so it actually does fit. you really only need ceramics on the outside 2 transistors.

http://www.thatcorp.com/300-series_Matched_Transistor_Array_ICs.shtml its the only thing that is not stupidly priced, and is ultra low noise, and in stock at mouser. Otherwise a pair of the analog devices parts is something like $40 per channel. if i'm clever enough i can make the new board take both fets and this chip.

I'm tired of waiting on linear systems, and have found a suitable part for the front end. Bipolar, 2 x pnp and 2 x npn all on one substrate. Reasonably priced and less than 2 nv/roothz noise. input impedance won't be as high, but should otherwise work great. sample parts on the way.

its all super low in carbs right??

That makes sense. Wrong, but makes sense.

A package arrived today with these items in it, sender unknown http://gilmore.chem....du/dsc_2310.jpg i'm afraid of the stuff in the plastic bags.

390VA should be 150VA 450v x .150 amp is 67 watts x 2 is about 140 watts plus 10 watts of low voltage.

I need a couple more transformers

http://en.wikipedia.org/wiki/Brenniv%C3%ADn and it is NASTY

And the stuff they get shitfaced on is NASTY. Birgir sent me a bottle of that crap, and the hangover that must generate is probably why you see those guys with horns on their heads and a large sword in their hands.

So here is how this actually went down. Remember all those T2 chassis i shipped outside the USA last year... At the time the size of the box (girth plus height) was less than the maximum size and was less than the maximum weight. So it shipped USPS priority mail, about $215 to europe. Well times have changed and the USPS is just about bankrupt. So the size and weight have shrunk so that if i had to ship the T2 chassis now, it would just barely meet the requirements, and for next year, NO WAY. So there were 2 choices to ship the beast to iceland. Package size is 24 x 24 x 7 inches. and it weighs 40 lbs. So i could not ship the thing priority. So option 1 was fedex direct, the shipping cost was $515. (slowest way possible) option 2 was USPS global express mail. Which it turns out is actually also fedex but USPS gets a great deal because they are moving everything over to fedex. So it was $316. Fine. Birgir told me how much to insure it for. But when i got to the post office, i ran into this fucking asshole who i hate and who is incompetent. But he was the only one at the counter at the time. Rash of shit later, and an inch of customs forms later, finally got to the computer, and there was an extremely limited dropdown list of available contents. He refused to actually type in something saying i would get it back. There was no "amplifier" or "digital audio converter" or anything like that. And the only thing in the list that was close was "audio tapes" So i wrote "audio tapes device" on the customs forms, and off it went. Part 2 of this is that fedex asseses the duty for the receiving country, saving their inspectors the time and trouble that they have to go thru for priority mail. So the duty charge was $80 which isn't even right on insurance of $220. With a shipping cost of $316. What the thing is actually worth is for the buyer to determine. And none of this is my fault Its all seriously fucked up.

You had better be careful. You are going to have a smile on your face for a very long time to come.

audio tapes device seriously!

And birgir had the wonderful opportunity to get said $10k source for only $80 in duties due to my creativity in shipping the beast due to its size. Its a little more than mehh, but not worth $10k in my opinion. Seems like the current versions of that thing have even more bling, but not any more performance.

electo-static. I can live with that. nothing a little stickon with a ^ and a tilted R won't fix.