...it's been a long time coming, but I think I'm over due to build this. I've most of the parts here or on the way, so I'm getting organized to build. I thought I'd put this on the forum to keep me on task.
State of play to start...
State of play to start...
First side projects are reforming the old mega caps, and building up a chassis first (not last like usual!)
And I think the first choice is 'do I want this 5mm plate to connect the two heatsink pieces?'
I'm thinking yes...
I'm thinking yes...
UP...excellent amp! Way to complex for me so I focus on mechanics and design while a good friend of mine soldered all parts, did the wirings and settings
Hey all,
Can anyone say if I can sub in...
2SA1360-y for 2SA1209
2sc3423-y for 2SC2911
please?
As I read the datasheets, I should be fine, for whatever that is worth...
Can anyone say if I can sub in...
2SA1360-y for 2SA1209
2sc3423-y for 2SC2911
please?
As I read the datasheets, I should be fine, for whatever that is worth...
according to ECA VRT 2009, 1360 is somewhat weakling-looking
50mA vs. 140mA (1209)
means - it'll not go puff! with 15-20mA of Iq in outer ring of Up UGS, but still better to have greater headroom
dunno - I'm not so eek! thinking of old good workhorse pair - BD139 and BD140, at least as temporary solution ......... easy to swap them when you get Kosher ones
50mA vs. 140mA (1209)
means - it'll not go puff! with 15-20mA of Iq in outer ring of Up UGS, but still better to have greater headroom
dunno - I'm not so eek! thinking of old good workhorse pair - BD139 and BD140, at least as temporary solution ......... easy to swap them when you get Kosher ones
Attachments
Cheers Zen Mod! I was rather working on the 'best parts are the parts I have' approach there. That said getting bd139/140 is easy where I am, and I'm not precious about toshiba only parts in the build...
I'll do some checking on potential supply of the 'correct' toshibas and make a call from there. 😉
...
...and I can buy in multiples of 833 units from digikey (and thats the only kosher supplier) with an additional shipping charge 🤣. Bd139/bd140 it is!
I'll do some checking on potential supply of the 'correct' toshibas and make a call from there. 😉
...
...and I can buy in multiples of 833 units from digikey (and thats the only kosher supplier) with an additional shipping charge 🤣. Bd139/bd140 it is!
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I don't believe that anyone on this World is faking BD139/140
so, if you search for Philips BD1xx-16 anywhere, big chance is that you'll get what you think you paid
now, of 3 legged fuses, I'm not thinking that 833pcs is too much, only if thinking of BC546/556 and - well , 2SK2145BL ( 5legged, but whatever)
so, if you search for Philips BD1xx-16 anywhere, big chance is that you'll get what you think you paid
now, of 3 legged fuses, I'm not thinking that 833pcs is too much, only if thinking of BC546/556 and - well , 2SK2145BL ( 5legged, but whatever)
another 833 units? ...I already suspect my actual hobby is collecting parts and organising them.🤔
Matched Fet's are on the way, courtesty of the DIY audio store, and parts for the modules them selves are to be ordered soon. I'm trying to justify to myself buying premium/new parts, rather than utilise what I've got on hand (which are a bit of a mish mash of old/ebay/random). Like, i've literally hundreds (thousands?) of capacitors that'd be close enough, but, do I really want to try and debug such a complex build is theres a random shorted one somewhere?
Aaanyway, whilst I have that internal debate with myself, I've a chassis to build. First step is going to be marking out, drilling and tapping the plates for the amp modules, and then drilling/tapping the heatsinks to mate to the plate in turn. I think I'm going to cheat a bit though - the (now) Bd1xx transistors (except one) don't need mounted to the plate, and for me that's 24 less pins that need to be perfectly aligned to get the amp pcb on the heatsink. I can only imagine the swearing should I give that a try... I'll just use a wee bit of ally angle as a shared heatsink for them all.
Aaanyway, whilst I have that internal debate with myself, I've a chassis to build. First step is going to be marking out, drilling and tapping the plates for the amp modules, and then drilling/tapping the heatsinks to mate to the plate in turn. I think I'm going to cheat a bit though - the (now) Bd1xx transistors (except one) don't need mounted to the plate, and for me that's 24 less pins that need to be perfectly aligned to get the amp pcb on the heatsink. I can only imagine the swearing should I give that a try... I'll just use a wee bit of ally angle as a shared heatsink for them all.
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Matched fets have arrived, and more parts are on the way. Bulk bd139 and bd140 on the way as well.
Chassis making has been slow - I have some plate ally to pickup and a bunch of timber to process for the front. I'm doing a few chassis all at once in the name of efficiency.
Progress at least! I thought these fets were stuck at customs...
Chassis making has been slow - I have some plate ally to pickup and a bunch of timber to process for the front. I'm doing a few chassis all at once in the name of efficiency.
Progress at least! I thought these fets were stuck at customs...
