Harman Kardon HK 770

[Zen Mod]

Originally Posted by argonrepublic

Along those same lines. What can I install in series to attenuate HK-770 without signal degradation?
What mods will clean it up?

probably plain voltage divider :

100K in line with signal , then 100K shunted to gnd

you'll have 6db attenuation

for mods - read here :

Manu's HK Tower & ZM's Silver Turm

[mp9]

i think my hk 880 vxi may have a 100k volume pot because the print on it

reads 00202 - 100K (?) x2 , i can't make out what the (?) is but it's a smaller

text. i'll try again when i find the magnifying glass.

[Zen Mod]

Originally Posted by mp9

i think my hk 880 vxi may have a 100k volume pot because the print on it

reads 00202 - 100K (?) x2 , i can't make out what the (?) is but it's a smaller

text. i'll try again when i find the magnifying glass.

can you measure resistance between to outer pins of pot?

[mp9]

i tried setting on kΩ and Ω, but didn't get a reading, it's mounted to a board along with a loudness switch which i plan on removing.
newbee question, was i supposed to do it with the power on and or did i use the wrong setting on my multi meter (it has: VDC VAC OHMS Ω with, >| -)))) (audio) symbols i don't understand, CAP,TEMP,FREQ%duty, µA, mA and A ac/dc)?

[Zen Mod]

Originally Posted by mp9

i tried setting on kΩ and Ω, but didn't get a reading, it's mounted to a board along with a loudness switch which i plan on removing.
newbee question, was i supposed to do it with the power on and or did i use the wrong setting on my multi meter (it has: VDC VAC OHMS Ω with, >| -)))) (audio) symbols i don't understand, CAP,TEMP,FREQ%duty, µA, mA and A ac/dc)?

turn bloody thing off , and pull AC cord from wall ; you're risking death of you ,of amp , or both .

put multimeter in 200K range and try .

[mp9]

touching the the first and third wire of one of the (2), stereo wires from the innards to the board the volume pot is mounted on; 63.1 set @ k Ω .OL and 32.23 @ k Ω O.L for what ever reason it jumps around allot.
when i touch the two outer solder points of four located directly under the volume pot i get 12.50 @ O.L k Ω and 32.86 @ Ω from the first two solder points.

[argonrepublic]

I reduce my output digitally by 8db, my decibels are nice, a comfortable volume but I lose dynamics and punch. Wondering if I should use a russound voulume control or if I can simply put a couple of high quality resistor in series on speaker cables. Should I attenuate the line level instead? Output is -10dbv

[gain-wire]

well, you could convert both inputs (RCA) to SMA or BNC type connections install a fixed dB attenuator (few $), and have again SMa or BNC jacks to RCA...

a bit overkill, but those attenuators are made for RF and...


nevermind, it's 50ohms impedance, won't be good for your inputs... or outputs.

I gotta ask though, do you really think you'll hear the degradation of an added resistor in the signal path? I mean, come on!

I'd do what Zen Mod suggested in his last post.