Are you re-using the original BC239 matched input pair?
OMG I spent hours last week scanning and making PCB board layouts for these cards!
Did you do reg boards as well? edit: scratch that yours is 160 so no reg!
I just finished complete rebuilds of 3 X NAP 250 boltups. Have changed every component except for transformers.
I have some leftover parts like switches, lenscaps etc. I've "modernized" mine with a blue switch.
Also I have a bunch of Kemet milspec 47uf wet tantalums that I've used for feedback caps and am happy with the sound.
Got any pictures of the rebuilds? I'd love to see one of them!
I'm still chasing wire wound resistors and some ZTX753's. I need to get the hfe checked on my transistor pairs too. I might need to order a bunch and get someone local to check them. Or check the originals for that matter.
I also need to check out my output transistors (TR11 & 12 in the diagram) as I have no idea if they're any good. Any suggestions? Accoustica suggests MJ15003 (Or BUV20's but stuff that, $30 each!).
Yeah, easy to get. I just had to wait and see which parts turned up from the local supplier. They were a bit of a lucky dip. They seemed to have a knack for not finding direct replacements on E14 (where most of their parts come from). I got silver mica caps instead of styrene's, for instance. E14 had the right parts, I found out after they turned up, but oh well. They should work.
I've never heard this amp work so any sound will be ok as a starting point. I'm really just hoping it doesn't burn up when I hit the power button.
Got any pictures of the rebuilds? I'd love to see one of them!
I'm still chasing wire wound resistors and some ZTX753's. I need to get the hfe checked on my transistor pairs too. I might need to order a bunch and get someone local to check them. Or check the originals for that matter.
I also need to check out my output transistors (TR11 & 12 in the diagram) as I have no idea if they're any good. Any suggestions? Accoustica suggests MJ15003 (Or BUV20's but stuff that, $30 each!).
Got any pictures of the rebuilds? I'd love to see one of them!
I'm still chasing wire wound resistors and some ZTX753's. I need to get the hfe checked on my transistor pairs too. I might need to order a bunch and get someone local to check them. Or check the originals for that matter.
I also need to check out my output transistors (TR11 & 12 in the diagram) as I have no idea if they're any good. Any suggestions? Accoustica suggests MJ15003 (Or BUV20's but stuff that, $30 each!).