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kevin gilmore

High Rollers
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Everything posted by kevin gilmore

  1. the 45k miles is a joke. i had 4 sets of the as3,3+ over the years and never got more than 30k. completely even wear. different car of course, but would expect the suv to be worse. those high mileage tires are not going to ride as nice.
  2. its still 2 boxes. but sure if you want to build it that way.
  3. nope, going to need two boxes. no easy way to stack the front end board onto the heatsinks. the 2 boards will take up much of the bottom. zero feedback generally ends up with a lower damping factor. so to boost the damping factor need more output transistors in parallel. and the sanken parts are actually 2 die in each package. and are to3p. i could go to 3 or 4 pairs of output transistors for even lower output impedance. the idea is to drive jbl m2's with the amplification they deserve. not a pair of crown industrial amps. and things like the susvara.
  4. its already a split board. the power resistors make it impossible to shrink. joamat may come up with a solution but i doubt it. but you can download some free layout software and try to come up with something smaller.
  5. won't fit in a 2u. if you do all the transistors on 1 edge its too long for the case. unless you want to do fully custom
  6. oops, to3pf according to the datasheet spacing .75 inch instead of .5 inch. board is about to get bigger. or i find different transistors.
  7. i'm trying hard not to get this to uberamp size there are wonderful t03p transistors that would be great but then the heatsink would be 8 inches high instead of 3.57
  8. going to have to buy one, have not figured out which one yet, then test. i did a uberamp with a smps, it was fine. i have a couple of lambda smps that i use for testing, absolutely dead quiet.
  9. gerbers will be available after much more checking. lots and lots of editing was done. but if you really want to be first, i can arrange for gerbers to be delivered. you can do the checking before making boards. i got to hear a cfa3 driving vintage klipsch belle. stunning. also it was running stupid hot. so this will take care of all of that. should make all the raal owners real happy. (and deaf) (and fried diaphrams) connex switching power supplies recommended. a linear power supply would be very large and heavy.
  10. a pre turkey day new year teaser. sanken output transistors, in parallel. with appropriate switching power supplies, capable of about 25 amperes. can be built with 30v, 35v, 40v power supplies if you change out the pzta06/pzta56 with bf722/bf723 then you can go up to 60v supplies. with 40v supplies and big enough heatsinks, 100 watts rms into 8 ohms. lets see how much joamat can shrink this one. balanced output impedance, .5 ohm
  11. the to243 definitely work and are the same pinout. also probably out of stock. seems like the to92 versions like to blow up in some situations.
  12. that board was designed for a specific chassis. which one, i no longer remember. i could make it fit a current chassis if that is what people want.
  13. keeps any dc out of the transformers. even small amounts of dc would saturate the transformers real quick. mikhail used the same circuit on the square wave instead of using a servo.
  14. needed to invert the signal to the integrator. a non-inverting integrator did not have enough voltage gain.
  15. all the parts in that unit are current production parts. but if you don't have them in stock you might have to wait 6 to 8 months.
  16. if you do not have a digital voltmeter and do not know how to use it, then you need to stop now before you get hurt. find someone that has experience with high voltage tube amplifiers.
  17. this is another of the JR audio builds where they took my gerber files and reloaded them and then proceeded to do a hack job on the boards changing all the part values to R# and C# without supplying schematics, moved around a bunch of lands so that they could replace the english connectors with metric connectors, then had boards made with 1 oz copper. the +/-15 supply is of their own design with the ic's having their numbers sanded off etc. since there is no sound from either channel its likely that one or more of the power supplies is not functioning. after the felista megatron, i am DONE with trying to repair stuff that is built like this. someone with the expertise as well as a stock of required parts will be needed to fix this. many of the parts are on infinite backorder.
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