Manu's HK Tower & ZM's Silver Turm

[Zen Mod]

beauty top left ch 2

 

[Manu]

I hear Jacco saying "I hate you" ...

Pas vrai mon capitaine?

Manu

 

[Zen Mod]

I hear Jacco saying "I hate you" ...

Pas vrai mon capitaine?

Manu

I was just mail/chatting with him regarding donkey thing ...... I'm on 99,6

so........

here it is - beauty top other ch (which is right , which is left )

 

[Zen Mod]

HK pcb in Silver

look at size of L shaped predrivers/drivers heatsink

 

[Zen Mod]

same - other channel - origigi Silver pcb

lookie - predriver/driver htsnk isn't L shaped - it's smaller

they're (both) scorching hot , even on bias set by SM;

I need to make biggest I can squeeze in , to be able to up bias ........ plan is 40W on heatsinks .... ~ 500mA Iq , or just 10W per output xistor

 

[Zen Mod]

bottom , overall
new wiring for spks routes (pinky fat ones )
cleaned harness
changed dreky grounding

 

[Zen Mod]

these new spk wires are going to back pcb , where are situated output relays for section A/section B ;

now they're (a and B) connected in parallel , wiring routed ditto to relay pins

Boucherots for both channels are on that pcb

 

[Zen Mod]

new spk wiring - channel one , closer

 

[Zen Mod]

new spk wiring - channel two , closer

 

[Zen Mod]

old DIN 555Way spk posts ;

they were two blocks (A and B) on back

 

[Zen Mod]

old Technics amp is good ........ as donor for Silver ;

these 5555Way spk posts are origigi Technics ones

they're looking much better , and they're certainly more adequate ;

 

[Zen Mod]

heatsinks in transport ...... disaster ;

this - fatest (leftmost) fin was completely broken ;

in fact - it wasn't even sent to me from Yoda in same shipment , but later

now - in place - glued , with (highlighted ) support piece

 

[Zen Mod]

another angle - repaired fin

yup

bored , holes in rest of heatsink tapped , 3 screws

you can also see new IEC mains dose

 

[Zen Mod]

ooops

 

[Manu]

Naaaahhh. no uuups
I want it ...


BTW nice glue repair ... ... good job ... perfect in fact..

Manu

 

[Zen Mod]

Naaaahhh. no uuups
I want it ...


BTW nice glue repair ... ... good job ... perfect in fact..

Manu

for your eyes only - glue was just a filler , in fact

 

[voah]

Nice

You`ll make it runs hot.
BTW,my ex HK870 was very usefull in the cold winter nights (biased @ a bit over 200mA per chanel).

 

[Blues]

Eetz zo fugly!

 

[steenoe]

Good work and a good find
How does it sound?

 

[Zen Mod]

Good work and a good find
How does it sound?

Manu will tell how his HK sounds (ditto from box , untouched , with all these years on shoulders , without any tweak ) comparing to his A5

I didn't fired up my yet , except on the bench ;
anyway - I tested ( repaired ) one combo few years ago - that's why I had idea to pursuing them

for testing purposes , I tried it in clipping too ;
you can imaging how heavy clip is - 80Vpp , with enough sine input (at 440Hz) that looks almost as perfect square

OK - I cheated - without load on output

edit :

plan is - to exchange all resistors to MF , tweak input resistance , check dissipation of predrivers , change input cap , decrease Iq ( to burning hand point ~ 40-50W/channel) tweak value of 1uF cap across Vbe multiplier ( bias xistor) ;

after that - preamp - HK725 ; it's in fact very nice discrete OP with Jfet input ;

maybe I'll call it DOSNS10 - Death Of Steen's NS10 .......