kevin gilmore

going to look at it in a few minutes. should be ground i think. nope, thats the feedback on the output. and the gerber file is correct. not sure where you got that picture, probably here, and likely not done. 3 of the other versions had the same error, all are updated on the google shares. no idea how that happened. someone needs to go thru all 9 versions (or more) to see if there are any more errors. i'm kind of busy waxing my brand new 2025 corvette Z06 3lz htc.

12 volt filament version with pin 6 grounded. for existing boards modification is easy. solder short wire from pin 6 to the ground pin on the .1uf 630v cap nearest to that tube. megatron12vcs - CADCAM.ZIP

will look into the megatron boards and see if the mods are easy. likely they are.

since pin 6 of the tube is a no connect, you can modify the amplifier and tie the 4 pin 6's to chassis ground. then in the adapter, pin 6 to the heatsink.

great idea. but there had better be a tail to ground the heatsink. otherwise not safe.

someone asked for this, so here is the amp board. working on power supply board now need to find a suitable chassis. power supply board in progress. cfaelectrostatschem2-4 - CADCAM.ZIP cfaelectrostatschem2-3.PDF cfaelectrostatschem2-3ps - CADCAM.ZIP

well there are apex chips that do sound good. but they are stupid pricy. and require large heat sinks.

it could have originally been 2 different transistors for the darlington in which case the original diagram might have been correct. since this is 30 years old, any original ideas are long gone.

you are not looking carefully enough. there is much more wrong with this thing. hint: power supply

makes sense.

same push pull stacked circuit with higher voltage all smd parts. also this https://buyee.jp/item/yahoo/auction/d1165787088 ac powered version of stax d10 with the lower voltage apex parts.

this is why i have 4 sets of tires for 2 cars. seriously under 40 degrees F is death for summer only performance tires. besides which the tires will crack and then you have to throw them out.

koss pro4a ? definitely koss

with the sanyo transistors 5v results in about 500ma bias. which was the original design spec for this board.