kevin gilmore

thats a great way to break a tap and ruin the heatsink. get a tapping jig.

that is one of the ways of building it.

if you can't copy it now...

well there are 2 ways to do this. instrumentation amp and inverting/non inverting. pick one, they are roughly equivalent.

posted for the owner who will comment much further. (for some reason he cannot publish high res pictures)

there is no way this is going to be a diy product.

lazy huh? ubaltobaltubeschem2 - cadcam.zip ubaltobaltubeschem2flip - cadcam.zip

there are already tube input versions. but this version does not have a servo on the output board, so it would need that. there is a version of that too, outputbuf2020 and outputbuf2020m

i found the synthesis file it is now posted in the documents directory cfaelectrostaticschem.pdf in the boards share there is cfaelectrostat.zip and electrostat2.zip there are other surface mount versions that have not been posted next time don't post twice, and you can always ask me

i found the synthesis file it is now posted in the documents directory cfaelectrostaticschem.pdf in the boards share there is cfaelectrostat.zip and electrostat2.zip there are other surface mount versions that have not been posted

so split versions of the cfa3 board. stack the boards together and put on the heatsink (minimum heatsink vertical dimension 83mm) stack the boards together, use angle bracket mount horizontally for low profile chassis etc cfp3smt2splitamp - CADCAM.ZIP cfp3smt2splitpre - CADCAM.ZIP

so i have got a number of contacts, most with felista built amps, definitely with fake toshiba transistors that blow up. Now another person with toshiba parts with the amp oscillating. Other changes were made, so who knows, and no idea if the transistors are real or fakes. being discontinued more than 10 years ago, everything on ebay has to be fake. so word of warning to people building them and trying to use toshiba (fake) parts. no way to know if they are fake unless you use a transistor tester. biggest tell is that they test barely at 25-30 volts instead of 120

A tube diode CRC power supply driving GRHV would have slightly lower noise.

you are going to need a pile of floating filament transformers. although now that SumR has finally produced transformers that are the right voltage and run cool this is easy. this one has regulated 300v and RCLCC high voltage supplies each with tube diodes. that is 2 more transformers. This one is 211 watts. A standard T2 is about 250 watts. replacing the current sources with tubes will add another 80 watts. and lots more physical space. and more filament transformers This modified to fit amplifier board will not be published and would be useless to everyone. The standard amp board should be used. The 300v regulated tube board with the tube hv diodes would be publishable once i put all the tube sockets back on standard distances. The hv power supply board would be publishable if people are interested. both of these would only be released to people who promise not to let them fall into the hands of FUCKING INCOMPETENT MORONS.

its zero feedback or super symmetry. can't be both. a couple of people have made relay switches that switch from one to the other. all SS jumpered for SS all zf for zf mode.

by matching the tubes. its +/-5 volts typically.

you can expand the picture and read it NOT Felista Audio OTL Push-Pull Electronic Headphone Amplier For the record this is not a push pull amplifier.

i would check this real hard to make sure i did not introduce any errors. cfp3smt2 - CADCAM.ZIP

done and ready to ship

IT FUCKING WORKS. makes music and everything. transformers stone cold after 1 hour.

my latest is kgdynalobal9-cadcam which is version 1.2 i can't find anything with .4 on it if you are talking about kerry's board, that is not my property and i don't have the gerber files for that. or supply a link to a picture.

increase the voltage value of the zener.

i think the last remaining problem is that the batteries don't discharge evenly. but its highly likely that many other products out there have the same problem. kerry will get to it when he can. chassis etc is all done. i still think that we can make a more efficient power supply but that requires someone with extensive flyback transformer knowledge and someone that can make prototype transformers. want +/-300 with 2.5 watts of power. plus the bias. i received a miniature hv supply for the bias from Tajikistan and with modifications it works fine.

i will let kung explain if he wants to, but it is highly likely that this chinese product does not yet exist. evidently hvrv is also pretending to sell T2 and KGBH.

there are corncob led lights with up to 1kw equivalent output. i have a 500 watt equivalent one in my garage, was the biggest at the time, lights things up real nice.