This is da Grand Mother version of Naim lagendary Nap250 power amp AKA
BOLT Down version.-The sweetest Piece of military junk ever created.
-it is very rare only "sometime"for sale at UK,i got it from Ireland by chance,many years ago.I sold every naim nap i had and only keep this piece,so it must be a very"solid" player for sure.it is under my care and i am responsible to make it to the best it could.
-4 digit serial number 16xx
- DO -4 Rectifier.Ancient device.
-alot of wire - wire point to point soldering
-Standing side mounting power regulator board and Power board .
-Bolt Down chassis they can be opened from side or from top.piece by piece,and it was huge handjob involved in the making around 1979.(labour intensive vintage)
-much more earlier than CB nap250.
-Handmade circuit board
-Hand solder on every picked components
-All 8 TO-3 metal case mounted outside ,the whole chassis acting as heat sink which is much more thermal stable than(late nap250)which naim had moved them to be board mounted on much small heatsink ,thats why Nap135 requires cooling fan because of this thermal stability issue.
i offer my serviced BOLTdown Nap250 for sale.
-Fined tuned Regulator boards voltages to be exactly spot on and same for both channel;
-fined tune DC biasing to be same for both and still within safe SOA region.
-Kendeil 22000uf caps x2 vs stock 15000uf..a lot power stable on drum tracks.
- Grounding moved from Speaker terminal to a perfect Ground plane(follow Nap135s) all de existing Nap250s have "inferior "ground that why people who upgraded to Nap135s understood what i am saying!!! .
-All Grounding for each critical board revamped to a perfect ground plane
-All Power TO-3 on Audio board has decoupled to improve stability
-Input signal cap ->audiophiles
-Military Grade cap for feedback loop.
-Critical signal wire-upsized
-speaker terminal replaced with heavy duty type connector
-comes with 2 year Full warranty(no one can assured you but me),R u ready to rock the musics ?
All for Rm6000. cash!
none of the existing CB /Olive Nap250 can touch this beast i am assured!
there is one on ebay which is older than mine
Last edited by Naim-ThoR on Sat Nov 09, 2019 9:10 pm; edited 1 time in total
lets Consider this-
Bolt- Limited production 4 digit SN168x wor!
Case- Mass production
Nap250.0.5 -CB Era
Nap250.2 -Black Box era