m_cugat
New Member
Hello to all Mac specialists,
got my MX-110 (Z- series) back from a complete technical overhaul / restoration a couple of months ago.
Every component was checked thoroughly but only was changed in case of issue (to prevent the original character as close as possible), the tech explained. All tubes were measured strong, so no tube was changed. I have to admit, that I'd never used this item in my stereo before and needed a couple of weeks until I found the time to test it.
First, I found the sound too bright and it lacked authority in the bass region. I swapped some of the audio tubes (V13 - V17 > I will share my experience in an extra thread!), which bettered the situation, but still not satisfying compared to my C-28 (also freshly overhauled).
BTW at this time my stereo consists of: (Technics SL-1500 with Empire 2000 E/I) > MX-110 or C-28 (want to use both) > MC-30 > Klipsch Cornwall I.
Then I discovered a little hum out of the loudspeaker when listening to FM- radio. In loud passages you won't hear it but when it comes to quiet ones (e. g. when listening to classic music) there is always a noticeable (annoying) hum background!! I talked to the tech and he repeated that such old and tube driven items always hum!!
I've read a lot about the MX-110 and to my knowledge the MX-110 is supposed to be one of the best designs (60's) with a very low hum level (>70dB) and should not show noticeable hum even when used with higher volume levels!
The "phono" input shows (much) less hum and the "aux" is dead quiet!!!
That means the issue should be within the tuner and not within the audio section, right?
I already changed the V10 (6D10 Compactron) RCA= old to GE= new - no difference (unfortunately :-(...)
Does anybody know if there are tubes in the tuner section which are most likely to be responsible for hum?
(I know changing tubes in the tuner section requires realignment. But I want to do the troubleshooting in advance.)
Which tubes (brand) do you recomment?
Or do you think the hum is probably caused by other components such as resitors or capacitors?
Antenna- problem? (I use a simple 5 feet wire, signal quality is good)
Anything else or any opinions? What is your experience?
Thank you very much in advance!
Mat.
got my MX-110 (Z- series) back from a complete technical overhaul / restoration a couple of months ago.
Every component was checked thoroughly but only was changed in case of issue (to prevent the original character as close as possible), the tech explained. All tubes were measured strong, so no tube was changed. I have to admit, that I'd never used this item in my stereo before and needed a couple of weeks until I found the time to test it.
First, I found the sound too bright and it lacked authority in the bass region. I swapped some of the audio tubes (V13 - V17 > I will share my experience in an extra thread!), which bettered the situation, but still not satisfying compared to my C-28 (also freshly overhauled).
BTW at this time my stereo consists of: (Technics SL-1500 with Empire 2000 E/I) > MX-110 or C-28 (want to use both) > MC-30 > Klipsch Cornwall I.
Then I discovered a little hum out of the loudspeaker when listening to FM- radio. In loud passages you won't hear it but when it comes to quiet ones (e. g. when listening to classic music) there is always a noticeable (annoying) hum background!! I talked to the tech and he repeated that such old and tube driven items always hum!!
I've read a lot about the MX-110 and to my knowledge the MX-110 is supposed to be one of the best designs (60's) with a very low hum level (>70dB) and should not show noticeable hum even when used with higher volume levels!
The "phono" input shows (much) less hum and the "aux" is dead quiet!!!
That means the issue should be within the tuner and not within the audio section, right?
I already changed the V10 (6D10 Compactron) RCA= old to GE= new - no difference (unfortunately :-(...)
Does anybody know if there are tubes in the tuner section which are most likely to be responsible for hum?
(I know changing tubes in the tuner section requires realignment. But I want to do the troubleshooting in advance.)
Which tubes (brand) do you recomment?
Or do you think the hum is probably caused by other components such as resitors or capacitors?
Antenna- problem? (I use a simple 5 feet wire, signal quality is good)
Anything else or any opinions? What is your experience?
Thank you very much in advance!
Mat.
) that it would only be one faulty but uncritical (in terms of tuner alignment) tube which would have to be exchanged, like the 6D10.